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Polycom EF2241 User's Manual

1. Es EF BUS OUT 222 PIN TXD PIN 3 RXD PIN 5 Polycom Video Codec 4 wire Connection DA 5554 CL 5064 555 450 Rx 592050202056 2 POLYCOM CODEC 00 QA e XXX COO 2 lt 2 gt SKS 29 0 VERSA 5 60609 FOX 59 KLE 96002724 lt gt 2 Figure 6 Typical EF2241 connections The following steps are typically used to set up the EF2241 e Connect a microphone to each of the 4 mic line level inputs The mic line input accepts mini Phoenix connectors See Connector Pinouts on page 51 for pinouts of Phoenix connectors Polycom Inc 9 VoRTEX EF2241 Reference Manual INSTALLATION Connect speaker output to loudspeaker e f RS 232 remote control is desired connect the RS 232 REMOTE CONTROL port of the EF2241 to the remote control device such as an RS 232 interface to a touch panel or a COM port on a personal computer Connect the LINE jack to an analog telephone line e Connect the PHONE jack to an analog telephone set optional Connect the external power supply to the POWER SUPPLY INPUT jack of the EF2241 Set the country code on the EF2241 By default the phone interface will be dis abled until you select a country code for the telephony interface This can either be done with the front panel LCD menu or the RS 232 interface The country code
2. 52 e UL 24 57 Multiple Vortex Devices sse 4 10 11 13 17 21 pcr e teet eut LA oe FoR SE C PE 22 23 25 58 Noise Cancellation Per d erc le Rex 2 3 30 44 49 58 S NU UE 24 31 58 NOM Atteni ationi ecc ese ace tous tec decre etn das ie tpe ees 58 25 58 Non volatile Memory LOCK 28 OUTPUTS 2 ede e e e e e t De ette M nS 31 P BS sat 452s a attt it Aen E UE 3 10 17 24 Parallel Remote Control seen 4 7 Phantom qii pie Aor o eat Ro piis 7 15 30 44 Phoenix Connectors sie eno eoe ete enatis 5 9 52 PRONE asc RE DIL M ED e EAT OAT ALSO AICO ASD 2 7 10 17 18 24 44 Polycom Inc 61 VoRTEX EF2241 Reference Manual INDEX E NEA E EOE A acti ats be Fite a lane P RSA TE 58 ec eh Pme td nod ead bou via pet en 2 3 7 44 Power Preset reet eere entes 13 25 ol cur e ali 58 R Reference AEC e tei ade delit deed Eus 3 17 18 24 30 57 PEE 58 Remote Control S
3. COMMON CAUSES OF EXCESSIVE REMEDY ROOM GAIN Excessive remote reference input Apply enough gain to the codec phone amplification or program audio inputs which will make up the Reference input signal Excessive microphone amplification Select proper microphones for talker distance according to pickup pattern and directionality and properly cali brate mic inputs Excessive coupling between loud Reduce mic coupling by repositioning speaker audio and microphones mics or loudspeakers or by reducing loudspeaker amplification Table 3 Summary of Excessive Room Gain If you experience residual echo problems during a conference you can quickly check that the reference and microphone levels are calibrated and not causing room gain problems by using the Room Gain parameter See Verify Room Gain on page 14 If this excessive coupling activity level is evident on only one microphone input chan nel that microphone channel should either be redirected to reduce coupling to loud speaker audio or recalibrated as it will need to be turned down If the excessive coupling activity is observed on all or most microphone channels then this indicates either that the room audio 15 too loud or the reference signal may need to be recali brated this will be indicated by observing low activity levels on the SIGNAL LEVEL METER For the EF2241 to adapt effectively saturation overload or clipping must not occur at the
4. Hiermit erklart Polycom Ltd dass der EF2241 die grundlegenden Anforderungen und sonstige ma gebliche Bestimmungen der Richtlinie 1999 5 EG erf llt 1 Polycom Ltd nA vei tt EF2241 Baot g 1999 5 EK Vaatimustenmukaisuusvakuutus Polycom Ltd vakuuttaa t ten ett EF2241 on direktiivin 1999 5 EC keskeisten vaati musten sen muiden tata koskevien s nn sten mukainen D claration de conformit Par la pr sente Polycom Ltd d clare que ce EF2241 est conforme aux conditions essentielles et toute autre modalit pertinente de la Directive 1999 5 CE Dichiarazione di conformit Con la presente Polycom Ltd dichiara che il EF2241 soddisfa i requisiti essenziali e le altre disposizioni pertinenti della direttiva 1999 5 CE Verklaring van overeenstemming Hierbij verklaart Polycom Ltd dat diens EF2241 voldoet aan de basisvereisten en andere relevante voorwaarden van EG richtlijn 1999 5 EG Declara o de Conformidade Atrav s da presente a Polycom Ltd declara que este EF2241 se encontra em confor midade com os requisitos essenciais e outras disposi es relevantes da Directiva 1999 5 CE Declaraci n de conformidad Por la presente declarac
5. besides 3 30 EE BUS 5 7 10 11 17 18 20 EE 22 23 24 25 44 51 DR 58 EF Bus Reference 25 28 58 bc re bind 3 EF2241 Reference Manual 60 Technical Support 800 932 2774 INDEX Factory Default Settings Preset 0 11 13 15 22 Front Panel 28 eoe en ctc siet olet tiet Ee aia HD 52 Ground prete te 53 Ground Logic Input se eee 52 Ground Logic Output Neb len i 92 Ground Power Supply essere 52 GROUMG RS 232 dress Cose ek at 5 Grounding Pin 1 Compatible 8 d ML gen Ee ALAC 2 3 4 6 7 8 9 15 LED Ment eh te ceat ades sue 3 6 15 18 26 Line Echo Cancellation 44 Line Echo Canceller 0 0 8 3 58 ioo ellas ie 7 25 52 Logic OUPUT S REI EN 725 32 Matrix MatriX MIXE ne eti nett ca nae dhe 2 3 22 34 Mic Line Inputs Line Inputs Line Outputs
6. 55 VORTEX EF2241 Reference Manual WARRANTY INFORMATION What this warranty does not cover No User Serviceable Parts State Law Rights This warranty does not cover defects resulting from accidents damage while in tran sit to our service location alterations unauthorized repair failure to follow instruc tions misuse fire flood lightning acts of God or use in those countries where such use violates Part 779 of the Export Administration Regulations of the United States Department of Commerce If your Vortex product is not covered by our warranty call us at 800 932 2774 or fax us at 404 892 2512 for advice about whether we will repair your Vortex product and for other repair information including charges Polycom at its sole discretion may replace rather than repair your Vortex product with a new or reconditioned one of the same or similar design The repair or replacement is warranted for 90 days The limited warranties and remedies set forth above are exclusive and in lieu of all other warranties whether oral or written express or implied Polycom specifically disclaims any and all implied warranties including without limitation the warranties of merchantability and fitness for a particular purpose This product contains no user serviceable parts Please contact Polycom Installed Voice Business Group for repairs Attempts to repair this product by an unauthorized technician will void your warranty This limi
7. D A amplifier loudspeaker microphone and A D to cancel acoustic echoes If you overdrive the loudspeaker or insert a dynamics processor before the echo canceller the acoustic reflections picked up by the microphone do not match the signal fed to the loud speaker They are distorted copies of this signal The EF2241 cannot effectively can cel this distorted signal EF2241 Reference Manual 42 Technical Support 800 932 2774 TROUBLESHOOTING If you suspect the loudspeaker is introducing nonlinearities into the room acoustic path take these steps to minimize its influence on the echo canceller Keep the loudspeaker s volume level at less than three eighths of full scale If higher volume is required the EF2241 should operate effectively at volume set tings of up to 50 percent of full scale At more than 50 percent most audio sys tems and loudspeakers introduce significant nonlinearities The EF2241 may not adapt under these conditions and echoes may be heard If the loudspeaker has a bass control lower it Excessive bass can cause a boomy effect that is nonlinear In addition excessive bass may cause substantial mechanical coupling to the microphone through vibrations induced in the hous ings and support structures Increase the separation distance between microphones and the loudspeaker The EF2241 handles up to 10 dB of room gain between the loudspeaker and the microphone You may be exceeding this limit if
8. NOM Attenuation On for Outputs 1 4 On for Outputs A D Output Gain 0 dB PRESET 0 is preconfigured for a system with multiple Vortex devices In Preset 0 microphones are bussed out to other units on the W Bus Microphones are also input into each device on the W Bus INPUT WMO in the Matrix If you have multiple devices in your system save settings to a user preset Presets 16 47 on each device Saving a preset will only save the preset on that particular unit Also remember to set the POWER ON PRESET to the User Preset that you have saved your settings to otherwise the device will revert back to Preset 0 factory default 1f power is lost CHECK SURROUNDING EQUIPMENT Pick a Standard Signal Level Check Levels to the Codec Now that the physical connections to the EF2241 are set up it may be necessary to check the surrounding equipment to make sure levels are set correctly The following suggestions may be helpful in integrating the EF2241 into your system A standard nominal signal level should be used throughout the audio system Any equipment that does not operate at this standard level should be compensated for as close to the piece of equipment as possible A 0 dB nominal level is a good standard signal level For example a consumer VCR will probably generate a 8 dBu level As soon as the VCR signal arrives at an input with some gain control the input gain should be adjusted so that you get a 0 dB le
9. Parametric Peaking High Shelf Low Shelf Lowpass or Highpass Parametric Peaking Center Frequency in Hz between 20 Hz and 20 000 Hz in 1 Hz steps e Bandwidth in octaves between 0 05 and 2 octaves 0 05 octave steps e Gain in dB between 20 and 20 in 1 dB steps High Shelf Center Frequency in Hz between 20 Hz and 20 000 Hz in 1 Hz steps e Bandwidth in dB octave between 1 and 24 dB octave but is always less than or equal to 1 2 x Gain Gain in dB between 20 and 20 in 1 dB steps Low Shelf Center Frequency in Hz between 20 Hz and 20 000 Hz in 1 Hz steps e Bandwidth in dB octave between 1 and 24 dB octave but is always less than or equal to 1 2 x Gain e Gain in dB between 20 and 20 in 1 dB steps Low pass e Cutoff Frequency in Hz between 20 Hz and 20 000 Hz in 1 Hz steps Highpass e Cutoff Frequency in Hz between 20 Hz and 20 000 Hz in 1 Hz steps Center frequency on Parametric Peaking is the point with the most or least gain Bandwidth is the width halfway up the peak so if the peak is 10 dB it is the width between the points where the gain is 5 dB Center frequency on shelving filters is the frequency where it crosses the point half way between 0 dB and the gain of the filter halfway up the slope Polycom Inc 35 VORTEX EF2241 Reference Manual LCD MENU STRUCTURE PRESETS Restore Restores the selected preset Save Saves the selected user
10. Polycom Inc 37 VORTEX EF2241 Reference Manual TROUBLESHOOTING MATRIX MIXER Don t hear output Make sure the output is not muted e Check that the input you re expecting to hear is included in the output that you re listening to ECHO CANCELLER REFERENCE Room Audio Sounds Choppy RESIDUAL ECHO Reverberation vs Acoustic Echo If you hear the local room s audio from the loudspeakers and it sounds choppy you may have included the room s microphones in the echo canceller reference The echo canceller reference should NOT include the local room s microphones it should only contain the remote end s audio and program audio You can still add the local room s microphones to the local output with the matrix but do not add them to the echo canceller reference For more specific guidelines on what to include in your echo canceller reference see Build Your Echo Canceller Reference on page 17 You may hear residual echo if system levels are not set properly Improper level set tings anywhere in the audio path can introduce nonlinearities that hamper the opera tion of the EF2241 If you hear residual echo one ofthe following conditions may be causing the problem Do not confuse the residual echo of remote speech with the reverberation of local speech Reverberation of local speech is caused when the speech signal arrives at the microphone via several paths the direct path and multiple reflections from surfaces in the
11. The EF BUS a sueta Si d Puis Nu E 24 NE EM E E 25 Other EE2241 Features i d EEUU EN 25 ECD Menu Me 26 System Ment ce cis 28 NONE CONE OL MAE wae DE 29 TN PUI Se cso 30 at Ate 31 LUI teen 31 soe ie Eo ete ESR SSF SARA EEE 34 Parametric EQ Menu ue eere EEE deren edente 35 36 feet 36 TroubleshoOHflg 37 Automatic Microphone Mixer esee ee eene enne 37 Matrix MNC dui eee e e b eter idees ea et ite ren 38 Echo Canceller Reference eee nente enne enne 38 38 Contacting Technical Support eee 43 er 44 Compliance sno Eb Ene Et 45 Conference System DSIUTIS uo eru ea vare Mu qua d uS EM s 49 EF2241 Block Diagram dere teas t esate 50 Co
12. A D converter supplying the microphone input Saturation introduces nonlin ear signal distortions into what the AEC expects is a linearly echoed version of the remote speech Polycom Inc 41 VORTEX EF2241 Reference Manual TROUBLESHOOTING Insufficient Microphone Amplification Nonlinearity Nonlinear distortion causes a degradation or divergence of the AEC s internal model of the room acoustics In this situation the EF2241 cannot effectively cancel room echoes and a substantial amount of echo may be heard by the remote party Excessive microphone amplification also increases room gain See Excessive Room Gain on page 40 You can check for excessive microphone amplification by observing the front panel LEVEL INDICATOR during a normal conference The first yellow LED should illuminate frequently If the second yellow LED is illuminated constantly during normal speech or if the red LED illuminates or even flickers reduce the microphone input level Note Before you readjust the microphone input levels check to make sure you are looking at the correct channel on the LEVEL INDICATOR Note If you adjust the M ic LiNE INPUT level you will affect the room gain Check to make sure that the room gain limit is not exceeded See Verify Room Gain on page 14 Grossly insufficient microphone gain degrades EF2241 performance and weakens the out bound speech power level This has the effect of reducing the signal to noise ra
13. Cat 5 cable between the EF BUS OUT of the first device and the EF BUS IN of the second device Note The EF Bus must be connected so that the EF Bus In of one box is connected to the EF Bus Out of another Connecting the EF Bus In to another EF Bus In or Out to Out will not work 5 Connect another Cat 5 cable between the EF BUS OUT of the second device and the EF BUS IN of the third device and so on 6 Poweron all units at the same time EF2241 Reference Manual 10 Technical Support 800 932 2774 INSTALLATION Terminating the The EF2241 is self terminating so if you are connecting multiple EF2241s the EF EF2241 Bus does NOT need to be terminated However if you are linking the EF2241 to EF2280s terminate the EF Bus link Vortex EF2280 Pouycom Vortex EF2280 B Cat 5 cable Cat 5 cable Vortex EF2280 INSER rs sars 3 4 Vorrex EF2280 Vortex EF2241 Vortex EF2241 No Terminator Needed Figure 7 Only the EF2280 needs to be terminated when linked together with EF2241s FACTORY DEFAULT SETTINGS PRESET 0 The following is a list of the factory default settings of the EF2241 Since the micro phones and other equipment in your application may have different nominal levels you can start w
14. ITE WARNING This is a Class A product In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures Installation Instructions Installation must be performed in accordance with all relevant national wiring rules L Installation doit tre ex cut e conform ment tous les r glements nationaux appli cable au filage lectrique Plug acts as Disconnect Device The socket outlet to which this apparatus is connected must be installed near the equipment and must always be readily accessible Polycom Inc 47 VORTEX EF2241 Reference Manual TECHNICAL SPECIFICATIONS This page was intentionally left blank VORTEX EF2241 Reference Manual 48 Technical Support 800 932 2774 Mark R amp Directive This EF2241 has been marked with the CE mark This mark indicates compliance with EEC Directives 89 336 EEC 73 23 EEC 1999 5 EC A full copy of the Decla ration of Conformity can be obtained from Polycom Ltd 270 Bath Road Slough Berkshire SL1 4DX UK Declaration of Conformity Hereby Polycom Ltd declares that this EF2241 is in compliance with the essential requirements and other relevant provisions of Directive 1999 5 Konformitetserklzering Hermed erkl rer Polycom Ltd at indest ende EF2241 er i overensstemmelse med grundl ggende krav og de relevante punkter i direktiv 1999 5 EF Konformitatserklarung
15. can then be sent to one of the two internal automatic microphone mixers The system also contains a 23 x 17 main matrix four 7 x 3 submatrices and one 7 x 2 submatrix for transporting audio from the phone line The 23 x 17 main matrix has the following inputs Input channels 1 4 gated or ungated Input channels A D the internal signal generator 3 mixes of each of the four digital busses 3 mixes times 4 VorTEX EF2241 Reference Manual 2 Technical Support 800 932 2774 INTRODUCTION busses equals 12 inputs and 2 mixes of the P Bus for the telephone The 23 x 17 main matrix has the following outputs Outputs 1 4 and A D AEC Reference 1 and 2 W X Y and Z outputs to the digital expansion bus P output to the digital expansion bus output to the power amplifier and output to the phone line The EF2241 has 24 bit resolution 32 bit floating point computation and a 48 kHz sampling rate Polycom s proprietary noise cancellation on each of the 4 mic line inputs and the tele phone line helps to keep overall ambient noise to a minimum Polycom echo cancel lers are the only ones on the market to feature this patented technology Noise cancellation filters out ambient background noise such as noise from heating venti lating and air conditioning HVAC LCD projectors and road noise Our noise can cellation technology is not a noise gate It actually removes noise Therefore it enhances the operation and improves the sound quality o
16. control strings are also sent via the RS 232 port so your remote control device is instanta neously updated as well Press ENTER to select and store the parameter value or press ESC to cancel the selected value and return to the old value Pressing HOME has the effect of pressing ESC then HOME so the selected value will be cancelled and the menu will return to the top of the menu tree Parameters that toggle or select among a list of options will wrap around when you reach the end but parameters that adjust numeric values will not wrap around once the maximum or minimum value is reached While adjusting a parameter the UP DOWN button must be held down briefly before the repeat rate increases Polycom Inc 27 VORTEX EF2241 Reference Manual LCD MENU STRUCTURE SYSTEM MENU Power On Preset Acknowledgement Mode Bus Reference Error M essages Front Panel Lock Front Panel Password Device ID Baud Rate Flow Control LCD Contrast M eter Non Volatile Memory Lock Non Volatile Mem Password Screen Saver Last Restored Preset Software Version Reboot Vortex Figure 17 EF2241 System submenu The SYSTEM menu contains POWER ON PRESET ACKNOWLEDGEMENT BUS REFERENCE ERROR MESSAGES FRONT PANEL LOCK FRONT PANEL PASSWORD DEVICE ID BAUD RATE FLOW CONTROL LCD CONTRAST METER NON VOLATILE MEMORY LOCK NON VOLATILE MEMORY PASSWORD SCREEN SAVER SOFTWARE VERSION and REBOOT EF2241 configurations P
17. limits are designed to pro vide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radi ate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Opera tion of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense In accordance with part 15 of the FCC rules the user is cautioned that any changes or modifications not expressly approved by Polycom Inc could void the user s authority to operate the equipment This Class A digital apparatus complies with Canadian ICES 003 Cet appareil num rique de la classe A est conforme la norme NMB 003 du Can ada This equipment complies with part 68 of the FCC Rules Please refer to the labeling on equipment for the following information Registration Number Ringer Equivalence e Grantee s Name Model Number Serial Number and or Date of Manufacture e Country of Origin If requested this information must be provided to the telephone company Notes This registered equipment may not be used with party lines or coin lines If trouble is experienced the customer shall disconnect the registered equipment from the telephone line to determine if the registered equipment is
18. preset Presets 16 47 Factory presets Preset 0 15 cannot be overwritten Presets b Delete Deletes the selected user preset Presets 16 47 Factory Presets Presets 0 15 cannot be deleted Restore Save Presets 16 47 Delete Presets 16 47 Figure 25 EF2241 Presets submenu MACROS Run Macro 0 255 Allows you to run macros from the front panel menu Run M acro 0 255 Figure 26 EF2241 Macros submenu EF2241 Reference Manual 36 Technical Support 800 932 2774 TROUBLESHOOTING TROUBLESHOOTING AUTOMATIC MICROPHONE MIXER No microphones are gating Some microphones are not gating Too many microphones are gating Check if the microphones are muted Are microphones part of one of the 2 automixers Check if the microphones are assigned to an automixer Check if the microphones are muted Check microphone levels Are microphones set to the appropriate mic or line level Is phantom power on where needed The Hold Time may be too low Microphone channels gating On and Off too fre quently during short pauses in speech might be the result of setting the Hold Time too low Check Gating settings Are microphones Forced Off Is Chairman Mode on If you have assigned a Chairman Mic all other micro phones will gate Off once this microphone gates on Check Gating Priority If your inputs have a Gating Priority of 4 the micro phones may not gate as frequently Check Maximum Numbe
19. quantify the time it takes to completely remove the echo from a conferencing system Echo occurs due to a complete change of the acoustic environment such as the beginning of a phone call in a conference a change of microphone speaker placement or speaker volume adjustment A mix minus bus allows each device 1 e a Vortex device to create a mix of signals without its own Each device in the system can create four mixes W X Y and Z and place them on the bus Each device also can create three mixes each from the W X Y and Z busses of the other devices for a total of 12 mixes One mix 15 hard wired as a normal mix minus That is it is a unity gain mix of the signals from all other devices The other two mixes can have crosspoint gains on the signals from the other devices An echo canceller estimates the echo in an audio signal by using a reference and pre forms processing to eliminate the echo from the signal Polycom Inc 57 VORTEX EF2241 Reference Manual DEFINITION TERMS EF Bus Equalization Line Echo Macros Matrix Mixer Noise Cancellation NOM NOM Attenuation NOM Bus Presets Room Gain The EF Bus is a digital bus that includes the W X Y and Z audio busses as well as the echo canceller reference and remote control information It can be used to link multiple Vortex devices Equalization is the process of adjusting frequency characteristics of an audio signal Line echo is
20. the EF2241 17 18 19 20 PHONF LINE JACKS Use the PHONE jack for connecting an analog handset to the system Use the LINE jack for connecting to an analog telephone line MIC LINE INPUTS Connects to microphone at either mic or line level with or without phantom power LINE INPUTS Inputs A D at line level LINE OUTPUTS Outputs 1 4 and Outputs A D at line level Polycom Inc 7 VORTEX EF2241 Reference Manual INSTALLATION INSTALLATION North American Requirement This equipment is intended to only be installed by qualified service personnel The equipment shall be connected to a socket outlet that provides a protective earthing connection CAUTION To reduce the risk of fire use only No 26 AWG or larger telecommunica tion line cord MOUNTING THE EF2241 Recommendation For Easy Access Instructions for Securing Power Supply to Back of EF2241 The 2241 be mounted in a rack enclosure using four large screws 10 32 1 2 included with the unit One EF2241 fits in a single rack space While not required leave a single rack space in between the EF2241 and other units in your rack This gives you easier access to the back panel Locate the cable clamp on the back panel of the EF2241 above the power con nector Remove the screw and thread the power cord through the cable clamp Attach the cable clamp to the back panel of the EF2241 and tighten the screw Align the clamp so th
21. the loudspeaker is pointed directly at the microphones or if the loudspeaker volume is excessive loud speaker placement is not critical but it should not be pointed directly at the microphones CONTACTING TECHNICAL SUPPORT If these troubleshooting guidelines don t resolve the problem you are experiencing with the EF2241 please check our web site Attp www polycom com for the most current technical support information go to Products amp Services then to Voice Prod ucts then to Installed Voice Systems If you have further questions please contact us at Applications Engineering Polycom Installed Voice Business Group 1720 Peachtree Street NW Suite 220 Atlanta GA 30309 2439 Phone 800 932 2774 Fax 404 892 2512 Email vortex polycom com Before contacting us please review the warranty and repair policy on page 55 Polycom Inc 43 VORTEX EF2241 Reference Manual TECHNICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS MECHANICAL SPECIFICATIONS Dimensions Weight Connectors ELECTRICAL SPECIFICATIONS Power Power Consumption Phantom Power AUDIO I O Microphone Input Level Line Input Level Line Output Level Input Impedance Output Impedance Headroom Loudspeaker Output Power Amplifier PERFORMANCE SPECIFICATIONS Frequency Response Acoustic Echo Cancellation Span Total Cancellation of AEC Convergence Rate of AEC Line Echo Cancellation Span Total Cancellation of LEC Convergence Rat
22. 1 LEDs can be used without series resistors we have provided series resistors in the circuitry For best results LEDs with Vf 2 0 V and If 20 mA should be used Larger values may be used but may result in dimmer LEDs An LED with Vf less than 1 4 V should not be used without additional series resis tance Power Supply Input 35 215 VDC The power supply input accepts a 5 pin DIN male connector Only use the power supply provided by Polycom Use of other power supplies will void the warranty 1 Ground 2 Ground 3 5Vdc 3 A 4 15Vdc 0 3 5 15 4 1 2 Mic Line Inputs Line Inputs Line Outputs These audio connectors accept mini 3 5 mm 3 conductor terminal block provided See Note below for manufacturer information From left to right the conductors are positive signal negative signal and shield ground Note The information below lists manufacturer information for the Phoenix connector that is compatible with the parts we use Manufacturer Phoenix Contact Description Mini COMBICON 3 position plug 3 5 mm pitch Type Number MC 1 5 3 ST 3 5 or 1 5 3 ST 3 5 Part Number 1840379 EF2241 Reference Manual 52 Technical Support 800 932 2774 CONNECTOR PINOUTS CONNECTING UNBALANCED RCA TO BALANCED MINI PHOENIX RCA M ale Mini 3 5 mm Phoenix Figure 31 Cable construction for connecting unbalanced RCA to balanced mini Phoenix 3 cond
23. 19 VORTEX EF2241 Reference Manual INTEGRATING THE EF2241 INTO YOUR SYSTEM Local Max NOM Global Max NOM Off Attenuation Threshold Type Gating Mode Adaptive Threshold Manual Threshold and Gate Priority Signal Level Channel turns on when signal level isabove Adaptive Threshold Channel ON DIEN CM x 12258 9 ADAPTIVE THRESHO ED Audio RM Bd e BR 4 Channel OFF FF ATTENUATION Ambient Level Figure 13 Off Attenuation Hold Time Adaptive Threshold and Decay Time Global Settings Decay Time Decay time is the amount of time the microphone audio takes to ramp down to the Off Attenuation level after Hold Time Decay Time values range from 0 to 5000 msec The default value is 1000 msec Hold Time This is the amount of time the microphone stays On after the energy in the channel drops below the gating threshold The default value is 500 msec The range is 1 to 5000 msec Microphone channels gating On and Off too fre quently during short pauses in speech might be the result of setting the Hold Time too low while too many microphones gating on at the same time may be the result of Hold Time values that are too high Camera Gating Threshold Specifies the hold time for camera gating informa tion Mixer Settings Bus Mixer This command is used to assign one of the two internal automixers to one of the EF Bus automixer groups
24. 2241 Reference M anual Figure I What s Included with your Vortex EF2241 What s Not The following equipment is not included with the EF2241 product package but may Included be necessary to create a completely functional system Microphones Loudspeakers Audio cables Tools Needed for Installation Videoconferencing codec or other four wire interface optional RS 232 remote control device optional Screwdriver to mount the EF2241 in your rack Phoenix connector screwdriver Polycom Inc 5 VORTEX 2241 Reference Manual PRE INSTALLATION EF2241 FRONT AND REAR PANELS VORTEX Se POLYCOM CHANNEL ACTIVITY Vortex EF2241 S HONE CONNEET 2 3 j e 2 3 4 5 6 7 8 9 POLYCOM Vortex EF2241 10 11 1213 14 15 16 17 18 20 19 Figure 2 EF2241 Front and Rear Panels 1 2 eo no LCD DisPLAY Displays menu instructions for configuration and operation of the EF2241 DOWN BUTTON Scrolls backward through menu items at a particular level decreases the value of a parameter UP BUTTON Scrolls forward through menu items at a particular level or increases the value of a parameter ENTER Enters the menu and allows you to select and change parameter values Esc Returns to the next highest l
25. For example consider three Vortex devices each of which has 2 microphones assigned to Automixer 1 and 2 micro phones assigned to Automixer 2 Now if each of these devices sets their Auto mixer 1 to use Bus Mixer 5 for example then the three automixers one from each device will work as a single automixer containing 6 3 x 2 microphones Setting Bus Mixer to 0 means that the automixer is not grouped on the EF Bus and the automixers operate independently Chairman M ode Enables or disables Chairman Mode for the specified auto mixer Chairman Mic Sets the Chairman Microphone for the specified automixer Last Mic Mode Sets Last Mic On mode for the specified automixer Last Mic Number Sets the microphone number that will remain on when Last Mic On mode is set to manual Setting this value to 0 will cause the automixer to leave the last open microphone on The last microphone number is specified for each automixer but is only used in manual Last Mic On mode Local Max NOM Sets the maximum number of open microphones NOM limit for the specified automixer This NOM limit is a local limit meaning that this limit applies only to the specific Vortex device that it is set on Global NOM Sets the global maximum number of open microphones VorTEX EF2241 Reference Manual 20 Technical Support 800 932 2774 INTEGRATING THE EF2241 INTO YOUR SYSTEM NOM limit for each linked automixer The maximum value for this c
26. I MO T o N en P U Efeu __ Fius 4271 T pe 5 ver T wo ww vw ws ww v R 5 YMO 1 wi M x fr n Efes Ersu Erbe fr n Fou 3 Eee Zo 20 zm 29 234 7 2 Eres Erbus Eros Erbe Eres aud P82 Pes Pes pes 67 aT RENI Figure 10 Matrix page of origin EF2280 ID 00 Figure 11 EF Bus page of origin EF2280 ID 00 EF2241 Reference Manual 18 Technical Support 800 932 2774 INTEGRATING THE EF2241 INTO YOUR SYSTEM 2 Reta rete hax 2 ence AZ ER Asse Figure 12 Matrix page of linked devices If far end audio and program audio sources are on several Vortex devices 1 each far end audio and program audio source to each device Do this by assigning each signal input to either the W 2 bus 2 Assign an echo reference on each device that will include all far end audio and program audio sources CONFIGURE THE AUTOMATIC MICROPHONE MIXER Automixer Parameters The EF2241 contains two independent automatic microphone mixers Each input may be assigned to automatic mixer 1 automatic mixer 2 or neither but not bo
27. LS TO EMERGENCY NUMBERS 1 Remain on the line and briefly explain to the dispatcher the reason for the call 2 Perform such activities in the off peak hours such as early morning or late evening A FCC compliant telephone cord and modular plug is provided with this equipment This equipment is designed to be connected to the telephone network or premises wir ing using a compatible modular jack that is Part 68 complaint See the rest of these installation instructions for details NOTICE The Industry Canada label identifies certified equipment This certification means that the equipment meets telecommunications network protective operational and safety requirements as prescribed in the appropriate Terminal Equipment Techni cal Requirements document s The Department does not guarantee the equipment will operate to the user s satisfaction Before installing this equipment users should ensure that it is permissible to be con nected to the facilities of the local telecommunications company The equipment must also be installed using an acceptable method of connection The customer should be aware that compliance with the above conditions may not prevent degradation of ser vice in some situations Repairs to certified equipment should be coordinated by a representative designated by the supplier Any repairs or alterations made by the user to this equipment or equipment malfunctions may give the telecommunications company cause to request t
28. Mixer Settings Operating as an Independent Automixer Operating as One Automixer with Multiple Vortex Devices Default Settings To operate the Vortex device in any of the above possibilites two global parameters need to be changed the AUTOMIXER and the BUS MIXER see Figure 14 The AUTO MIXER parameter chooses which automixer the input channel will be on this is changed either on the AUTOMIXER page in Conference Composer or on the MATRIX MIXER page The BUS MIXER parameter is used to assign one of the two internal automixers to one of the EF Bus automixer groups For example consider three Vortex devices each of which has 2 microphones assigned to Automixer 1 and 2 microphones assigned to Automixer 2 Now if each of these devices sets their Automixer 1 to have Bus ID 5 then the three automixers one from each device will work as a single automixer con taining 6 3 x 2 microphones Setting BUS MIXER to 0 means that the automixer 15 not grouped on the EF Bus To set the Vortex device to operate as an independent automixer or two set the BUS MIXER parameter to 0 or to a number that is different from any other automixer group on the EF Bus To set the Vortex device to operate as one automixer across several devices set the Bus MIXER parameter on all devices to the same automixer group In the default preset Preset 0 the Bus Mixer for Automixer 1 is set to 1 and the Bus Mixer for Automixer 2 is set to 2 This means tha
29. O 0 uo ES lt 4711 esioN Jejj ooue 0423 amdu ganduy euryony ceuryonw zeuryony UNN smex onu 5 lt p saan lt gt 22258 lt 4 0 sun 7 7 y nuUa won 7 won NT woweua g of isn pe 9f isn pe of ofisnipe g t 19497 19497 P P jana gt euo E ra 9 sec sec 7 KZn Van Van Var Vf en Gindinp gindino vindino zjndino Ljindino penieses syy Ju Lo0z 1u6uAdog Figure 30 Inside the EF2241 800 932 2774 Technical Support 50 VORTEX EF2241 Reference Manual CONNECTOR PINOUTS CONNECTOR PINOUTS EF BUS IN EF BUS OUT MM 8 1 Cat 5 Plug Front View 1 6 2 E Jack End RJ 11 Plug End RJ 11 6 Conductor REM OTE CONTROL o qe RS 232 EF Bus The EF Bus uses RJ45 connectors These should be used with category five
30. Ry POLYCOM Vortex EF2241 Reference Manual VORTEX EF2241 REFERENCE MANUAL Introduction eere feo lett otto sane eiie dna eet edel ded oases 2 Product Features zt e tet ee a ee bee diee die een eet 3 va bu cil uia o aad 5 EF2241 Front and Rear Panels eese eene nennen nennen 6 NAO oi e De ipei ec I ees Ei ARR 8 Mounting the EE2241 1 4 dide te dg cete ge terere ede eater 8 Connecting the EF2241 to Other Equipment see 8 DevicelDs on the EF Bus seo e eet dee e teles 10 Connecting Multiple Vortex Devices esee 10 Factory Default Settings Preset 0 sse 11 Check Surrounding Equipment esee 13 Integrating the EF2241 Into Your 1 0 ennt I5 Input Settings eM eo AU ere te eer e tirer eed 15 Galibratiofi o a OR Np ge sete ee 15 Set up the Phone Interface esee eene eene 17 Build Your Echo Canceller Reference eee 17 Echo Canceller Reference for Multiple Vortex Devices 17 Configure the Automatic Microphone Mixer sse 19 Automixer Settings for Multiple Vortex Devices sss 21 Configure the Matrix 22 Building Your System with Multiple Vortex Devices sss 22
31. Settings gt M atrix Input Output EQ Run Macro 0 255 Acknowledgement Auto Hangup Automatic Gain Control Channel Mode Call Progress AGC In 1 4 T Mute Output Decay Gain ane Presets 16 47 B NOM Att Hold Time Gate In 1 4 Bus Reference Auto AGC Maximum enuation map Band Loop Drop In 1 4 T On Off gt Mute Presets 16 47 Error Messages Country Select AG LAT Output Delay Enable Settings Filter Type AM Frequency Front Panel Lock Y Dial Tone Gain Gain Output Delay G Bandwidth Bus ID an n ain Front Panel Password OMFG Level M ic Line Dynamics Processing Chairman M ode Mute ain Slope In 1 4 Out T Chairman Mic Filter Enable ast Mic On Mode Ring Tone Enable Mute Baud Rate Last Number Flow Control Noise Cancellation Local Max NOM In 1 4 T Global Meter Noise Cancellation Automixer Reference Non Volatile Level In 1 4 T Reference Bias Memory Lock Phantom Power Non Volatile In 1 4 Memory Password Channel Settings Reference Assign Inputs 1 4 In 1 4 Screen Saver AEC Suppression Automixer Last Restored Preset 0014 Threshold Line Echo Cancellation Gating Mode Software Version In Adaptive Threshold Dynamics Processing Manual Threshold Gate Priority LEC Suppression In T Figure 16 LCD Menu Tree DOWN UP ENTER Esc HOME Scrolls backward Scrolls forward Enters the menu Returns to thetop Returns t
32. Technical Support 800 932 2774 LCD MENU STRUCTURE OUTPUTS O utput Gain M ute Output NOM Attenuation On Off Output Delay Enable O utput Delay Dynamics Processing Figure 20 EF2241 Outputs submenu AUTOMIXER MENU Global Settings M ixer Settings Channel Settings Figure 21 EF2241 Automixer submenu Phone Input Gain This parameter adjusts the gain level of the Phone input Phone AGC Enables or disables automatic gain control on the Phone The OUTPUT menu contains GAIN NOM ACTIVE and MUTE As with the INPUT menus this is done on a per channel basis Output G ain Choose the gain applied to each output signal using this parameter The default setting is 0 dBu Though the EF2241 allows for positive output gain you should always try to adjust input gains to a good level so that the output gain 1s 0 dB If you find that you need a positive output gain from the EF2241 first check your input gain to make sure you are getting a good level around 0dB Keep the output gain at around 0 dBu Then for the best gain structure use your amplifier to raise the volume in your system M ute O utput Use this to mute or unmute each Output NOM Active This allows you to select whether the NOM attenuator is active for a particular output channel Outputs 1 4 A D The NOM attenuator will attenuate the output signal by 10 log NOM where is the number of open microphones in that particular output channel NOM is calcu
33. a system with multiple devices if all devices need the same echo canceller reference one device should be designated to put its echo cancel ler reference either Ref 1 or Ref 2 on the EF bus to be used as the EF Bus Reference other devices may use the EF bus reference as the reference for their echo cancel lers or they can use their own internal references The references may include a mix of any input with crosspoint gains including W X Y and Z busses NOM Bus The W X Y and Z busses on the EF Bus contain NOM information See NOM Active on page 31 for more information on how NOM attenuation is applied Note EF Bus must be connected so that the EF Bus Our of one Vortex device is connected to the EF Bus IN of another Vortex device Connecting EF Bus IN to another EF Bus IN or EF Bus Our to EF Bus will not work See Connector Pinouts on page 51 for pinout of Cat 5 cable Review what inputs need to be included in your echo canceller reference See Build Your Echo Canceller Reference on page 17 Remember that each micro phone needs to have an echo canceller reference If all microphones are in the same room and use the same reference configure the echo canceller reference on one Vor tex device and assign it to the EF Bus as the EF Bus Reference Only one Vortex device out of multiple units linked together can put an echo canceller reference on the EF Bus For each additional unit assign the echo cancell
34. assigned a value ranging from 1 to 4 Priority 1 microphones have priority over priority 4 microphones for gating The default is to have all microphones set to priority 1 If Chairman Mode is enabled all microphones including ones with priority of 1 will be gated off when the Chairman mic gates on MATRIX MENU The MATRIX contains commands for assigning input signals to output signals with appropriate gains applied or mutes applied It also allows for Gating to be turned on for Inputs 1 4 This menu can apply gains to both the MAIN MATRIX and the SUBMA TRIX Matrix m Crosspoint Gains Assign input signals to output signals with appropriate gains Main Matrix gt applied Gate Applies gating from Inputs 1 4 to an Output Gain M ute Applies mute to the crosspoint Gate In 1 4 M ute SubMatrix gt Gain M ute Figure 23 EF2241 Matrix submenu VorTEX EF2241 Reference Manual 34 Technical Support 800 932 2774 LCD MENU STRUCTURE PARAMETRIC EQ MENU Parametric EQ Input Output EQ Channel j __ Bad Filter Frequency Bandwidth Gain Slope Filter Enable Figure 24 EF2241 Parametric EQ sub menu The input equalizer is comprised of up to 5 bands of filtering The whole group of fil ters for the channel can also be enabled disabled without losing the settings for each band For each band you first select the type of filter from the following
35. at the power cable does not interfere with the connectors on the EF2241 back panel Plugin the power supply Werecommend that you also Ty wrap the power supply to the rack The purpose of securing the power supply to the back panel 15 so that if the power supply were to drop it would pull where the cord is attached with the cable clamp and not pull the plug out of the EF2241 Caution Do not use any other power supply other than the one pro vided with this unit CONNECTING THE EF 2241 TO OTHER EQUIPMENT Grounding The EF2241 has 4 mic line inputs plus 4 line level inputs and 8 line level outputs Each input output is Pin 1 compatible this means that the ground pin of each input output is tied to chassis ground Chassis ground is connected to the input power ground EF2241 Reference Manual 8 Technical Support 800 932 2774 INSTALLATION Typical EF2241 The EF2241 will typically be connected to other equipment in a single room setup as Connections shown below in Figure 5 and Figure 6 Polycom Video CODEC Line In Line Out Vortex EF2241 EFBus In Out Vortex EF2241 EF BUS IN INPUT 20 29 Es SPEAKER 3 POLYCOM Vortex EF2241 REMOTE CONTROL fon Fr A Xp Gog UNE INPUTS OUTPUT gt 690 3 3006 D c 2 464
36. boosting the signal because it is too low For example if the meter is showing an average gain of 15 dB Polycom Inc 15 VORTEX EF2241 Reference Manual INTEGRATING THE EF2241 INTO YOUR SYSTEM Set Levels on Line Input Channels you should increase your input gain by 15 dB If the meter shows an average gain of 10 dB you should decrease your input gain by 10 dB Channel 3 1 B Gate Room ABC AGC Level M eter Read AGC level B xit Recy Gain dB Et Adjust Input Gain here E Figure 9 AGC Meter on the Diagnostics page of the Conference Composer soft ware The gain adjustment 15 the same gain control on the Mic Line Inputs page in Conference Composer IF THE AGC METER SHOWS ADJUST THE INPUT GAIN IN THIS WAY Increase gain by the leve shown in the box positive gain Decrease gain by the leve shown in the box negative gain You ve set the Input Gain to a good level an average level of 0 dB Table 1 How to set the Input Gain using the AGC meter on the Conference Composer Diagnostics page Set the line input channel gains Channels A D to match the nominal level of the incoming equipment The line inputs have a maximum nominal level of 0 dBu If your incoming line level inputs have a higher nominal level than 0 dBu you will want to use a pad to remove the level If you are connecting from equipment that has RCA plugs you will most lik
37. cal specifications of the EF2241 Conference System Design gives suggestions on topics to consider when design ing your system EF2241 Block Diagram shows the inside of the EF2241 Connector Pinouts shows pinout diagrams for EF2241 input and output connec tors s Warranty Information Definition of Terms explains terms used in this manual as well as terms used in our technology of echo cancellation noise cancellation and audio conferencing About the EF2241 The Vortex EF2241 is a companion to the Vortex EF2280 or a stand alone solution for audio conferencing It automatically mixes four microphones and other audio while cancelling acoustic echoes and annoying background noise and features a built in add to bring telephone calls into the conference total of 8 Vortex devices can be linked together for instance 8 EF2280s or 2 EF2241s and 6 EF2280s The EF2241 has 4 mic line inputs 4 line inputs and 8 line outputs with 4 channels of acoustic echo and noise cancellation It has matrix mixing and automatic microphone mixing capabilities a single telephone line interface and a single channel power amp It includes a total of 8 analog inputs 4 mic line level inputs and 4 line level inputs 8 analog outputs and 5 digital expansion busses one being dedicated to phone Acoustic echo cancellation AEC and noise cancellation can be applied to each of the 4 mic line level inputs and each of these inputs
38. caused by reflections of the audio signal from the telephone hybrid The EF2241 is an example of a device that includes a line echo canceller An arbitrary set of commands that can be replayed A matrix mixer allows you to choose which inputs are included in each output Some matrix mixers allow you to assign crosspoint gains to the inputs Noise cancellation is a digital signal process that removes noise from an audio signal corrupted by real world interferences such as HVAC office noise crowd noise or road noise Generally there are two parts of a noise cancellation algorithm a method to detect the noise and a method to remove the noise The Polycom noise cancellation algorithm patent pending is capable of removing 10 dB or higher of noise with no degradation at all to the resulting speech signal This method does not attenuate speech and removes noise during both speech and idle periods NOM refers to the number of open microphones in a system NOM attenuation is the gain applied to the overall system gain to the microphone sig nals to compensate for how many microphones are open The amount of attenuation is calculated by 10 log NOM bus carries signal information as well as NOM information 1 the number of open microphones in the system NOM Presets correspond to configuration parameters that have been previously saved to EEPROM The room gain of a conferencing system refers to the relative levels of the si
39. e main matrix and be mixed with the other inputs to create outputs 1 4 A D Ref 1 Ref 2 and W X Y and Z bus outputs FROM BUS Safety Mute EFBus EFBus EFBus EFBus EFBus EFBus EFBus EFBus WBO WB wB2 wB3 wB4 wB5 WB6 WBO WB wB2 WB4 WB5 WB amp WB7 0 0 0 0 0 0 0 WMO SubMix WMO WMI SubMix WMT wM2 SubMix WM2 EFBus EFBus EFBus EFBus EFBus EFBus EFBus EFBus xB0 1 2 XB3 4 5 86 XB 1 XB3 XB4 XB5 XB5 0 0 0 0 0 0 0 SubMix XMO XM1 SubMix XM1 XM2 SubMix XM2 EFBus EFBus zx EFBus Y m m 5 x 0 0 0 0 0 0 0 YMO SubMix YMO YMI SubMix YM1 YM2 SubMix YM2 lt Od 0 0 0 0 0 0 ZMO SubMix ZMO zwi Sam ZM2 SubMix ZM2 PMO SubMix PMO PM1__ SubMix PM1 Not Muted vus Exported Signals AEC Reference Current Unit Exporting Signal none None Note Only one unit can place a reference siignal on the EFBus at Reference 1 time If you need to create a reference signal across multiple Reference 2 units use the W X Y and Z bus channels Figure 15 W X Y and Z submatrices the P submatrix and Exported Bus Reference EF2241 Reference Manual 24 Technical Support 800 932 2774 THE BUS 4 Configure Your Echo Canceller Reference PRESETS EF Bus Reference In
40. e of LEC Noise Cancellation Control Inputs Status Outputs 19 483 mm W x 9 6 244 mm L x 1 75 45 mm H full rack unit 4 Ib 1 8 kg dry 5 5 Ib 2 5 kg shipping Audio Mini 3 5mm quick connect terminal blocks RS 232 DB9F EF Bus In Out RJ45 Phone In Out RJ11 Control Status DB25F 110 240 VAC 47 63 Hz 30 W 24 V software selectable 30 dBu to 0 dBu 66 dBu to 33 dBu nominal software selectable 20 dBu to 0 dBu nominal software selectable 20 dBu to 0 dBu nominal software selectable gt 10 kOhms 50 Ohms drives 600 Ohms 20 dB nominal 10 W 4 16 Ohms 20 Hz to 22 kHz 270 ms gt 65 dB 40 dB second 32 ms gt 65 dB 40 dB second 0 dB to 15 dB software selectable Contact closure 5V 20 mA each VORTEX EF2241 Reference Manual 44 Technical Support 800 932 2774 TECHNICAL SPECIFICATIONS COMPLIANCE USA and Canada NOTE US Telco requirements The Vortex EF2241 complies with the ITU G 167 Recommendation for AEC FCC part 15 and CE requirements This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 This device must accept any interference received including interference that may cause undesired operation This equipment has been tested and found to comply with the limits for a Class A dig ital device pursuant to part 15 of the FCC Rules These
41. ee RS 232 Serial Remote Control or Parallel Remote Control dcc m e ERE RENE QNS Ne tse ae a ede 49 POONA mens cand AK 14 39 58 RS 232 Serial Remote Control sess 4 5 7 10 15 24 27 ee oe 30 44 51 5 Signal Generator ue boda uo te 223 SU 2 22 24 34 T 43 Terminating the EF Bus Terminators 11 53 18 23 EF2241 Reference Manual 62 Technical Support 800 932 2774 Polycom Inc Installed Voice Business Group 1720 Peachtree Street NW Suite 220 Atlanta GA 30309 2439 Phone 800 932 2774 404 892 3200 Fax 404 892 2512 www polycom com Technical Support 800 932 2774 vortex polycom com Polycom Vortex and the Polycom logo are registered trademarks of Polycom Inc in the United States and various countries Copyright 2002 Polycom Inc All rights reserved P N 1725 80098 001 Rev C
42. ely need 8 dB of gain on the Input and 8 dB of gain on the Output VORTEX EF2241 Reference Manual 16 Technical Support 800 932 2774 INTEGRATING THE EF2241 INTO YOUR SYSTEM Customize The following sections will describe customizing parameters on the EF2241 for your Setting for Your particular application if you are not using Preset 0 Particular Application SET UP THE PHONE INTERFACE The echo canceller reference of the EF2241 is by default set up with the phone input already assigned to it By default the phone interface will be disabled until you select a country code for the telephony interface This can either be done with the front panel LCD menu or the RS 232 interface The country code only needs to be selected the first time or when the country of the installation is changed Send audio from the phone to the outputs on the same device by unmuting the cross point of Input T on that output Send audio from the phone to other linked devices by using the P bus output in the EF Bus The linked devices can take the phone signal off the bus from the P Bus input BUILD YOUR ECHO CANCELLER REFERENCE The acoustic echo canceller AEC reference should generally contain exactly the same audio signals as what is coming out of your loudspeaker s since the signal out put from the loudspeaker is what is then picked up by the room s microphones caus ing acoustic echo Note that this statement is a general statement Conditions
43. er reference to use the EF Bus Reference For systems with more than one room you will need to use the W X Y or Z sub busses to share the echo canceller reference in your additional rooms if the EF Bus Reference has already been assigned to the EF Bus After configuring your Vortex device save your settings to a User Preset PRESETS 16 47 Also set the POWER ON PRESET to the User Preset you have saved to The POWER ON PRESET determines how the unit is configured upon power up If you have multiple Vortex devices in your system save to a User Preset on each unit and set the POWER ON PRESET accordingly OTHER EF2241 FEATURES For information on Macros Logic Inputs Logic Outputs Input Filters and Output Filters please refer to the Conference Composer User Guide Polycom Inc 25 VORTEX EF2241 Reference Manual LCD MENU STRUCTURE LCD MENU STRUCTURE The EF2241 LCD menu structure is made up of nine menu trees SYSTEM PHONE CONTROL INPUTS OUTPUTS AUTOMIXER MATRIX PARAMETRIC EQ PRESETS and MACROS Each menu tree is organized by levels and branches into multiple subcate LCD Menu Tree gories The branches end with an adjustable parameter or value EF2241 System Settings C System _ Phone Control C Inputs 1 4 T A D Outputs Automixer Matrix ParametricEQ Presets Power Preset Auto Answer Raj Output Gain Global
44. evel of menus HOME Returns to the top of the menu structure LEVEL INDICATOR Indicates the level of the selected channel or parameter PHONE CONNECT Takes the phone line on or off hook If you have an analog handset connected to the PHONE jack on the back panel pushing this button will disable the PHONE jack while enabling the LINE jack see Item 17 CHANNEL ACTIVITY LEDS Indicates gating activity of the 4 mic line channel inputs EF2241 Reference Manual 6 Technical Support 800 932 2774 PRE INSTALLATION i 95825 1011 1213 15 16 Figure 3 Parallel remote control EF BUS serial remote control power supply input and power amplifier output on back panel of the EF2241 10 11 12 13 14 15 16 INPUT PARALLEL PORT Parallel logic input OUTPUT PARALLEL PORT Parallel logic output EF BUS IN Connects to EF BUS OUT of another Vortex device EF Bus Our Connects to the EF BUS IN of another Vortex device RS 232 SERIAL PORT Connect this to an optional RS 232 remote control device such as a touch panel or personal computer COM port POWER SUPPLY INPUT Connects to the external power supply provided with the EF2241 POWER AMPLIFIER OUTPUT Drives up to 10 W into 4 16 Ohm speakers LINE OUTPUTS wy POLYCOM Fp Vortex EF2241 PHONE LINE 17 18 20 19 Figure 4 Inputs and outputs on back panel of
45. f an automixer for example by preventing it from bringing the noise level up and down when microphones are gated on and off By cancelling the noise picked up by each microphone the overall signal to noise ratio SNR is preserved The result is crystal clear speech over a greater decibel range than any other echo canceller That means reduced listener fatigue and a higher quality audio conference Product Please take a moment to fill out and return your registration card This information Registration will help us to provide you with better customer support and will allow us to notify you with updated product features and software PRODUCT FEATURES Product Front panel LCD for controlling and configuring the product without a computer 5 equalizer on all Inputs and Outputs Echo cancellation on Inputs 1 4 Noise cancellation up to 15 dB Two internal automatic microphone mixers for Inputs 1 4 23 17 full cross point matrix mixer with expansion bus Internal signal generator for calibration mode and noise masking applications 2 year warranty AEC 24 bit resolution 48 kHz sampling rate gt 20 kHz bandwidth 270 ms AEC tail length 40 dB sec convergence rate Can function in rooms with more than 10 dB of room gain LEC 32msLEC tail length 40 dB sec convergence rate 765 dB total cancellation Polycom Inc 3 VORTEX EF2241 Reference Manual INTRODUCTION Inputs and 4 micro
46. for this being true follow If your system e AEC reference should contain exactly the same audio as the loudspeaker does NOT have output all far end audio audio from the phone add program audio etc sound f your system contains stereo inputs and outputs the reference must contain a mix of both stereo inputs For example if your VCR audio is in stereo the refer reinforcement ence should contain both the left and right signals each attenuated by 3 dB as well as any other audio that is going to your loudspeaker Ifyou are using crosspoint gains in the loudspeaker mix apply the same gains to the signals in your reference If your system Do NOT mix your room microphones into the reference but include all other has sound audio program audio remote audio phone audio etc reinforcement ECHO CANCELLER REFERENCE FOR MULTIPLE VORTEX DEVICES In system with multiple devices we recommend that one device be designated as the unit that provides the EF bus reference for the acoustic echo cancellers This unit takes one of its reference signals either Ref 1 or Ref 2 and places it on the EF bus All other units that are linked together may use the EF bus reference as the reference Polycom Inc 17 VORTEX EF2241 Reference Manual INTEGRATING THE EF2241 INTO YOUR SYSTEM for their echo canceller or they can use their own internal references The references may include a mix of any input with crosspoint gains i
47. gnal sent to the line output to your amplifier before any amplification and the level of this sig nal that is reflected at the microphone input after microphone amplification If the electrical level of the reflected signal picked up by the microphone is the same as the level of the electrical signal sent from the AEC to the line output to your amplifier the VORTEX EF2241 Reference Manual 58 Technical Support 800 932 2774 DEFINITION TERMS room gain of this microphone channel is said to be 0 dB If reflected signal picked up by the microphone is higher than the level of the signal sent to the line output to your amplifier that microphone channel has positive room gain The more positive the room gain the harder the AEC must work to determine which signal is an echo and which is a local speech signal Polycom Inc 59 VORTEX EF2241 Reference Manual INDEX INDEX A Acoustic Echo Cancellation AEC 2 12 17 30 38 40 AEE E P MEME NEM ET 44 49 57 Automatic Gain Control AGC 4 30 57 Automixer Adaptive Threshold 12 21 33 Automixer Adaptvie Threshold 37 Automixer Automatic Microphone Mixer 2 3 19 21 31 37 57 Au
48. hanisms Gain 1 The most common is excessive amplification of the remote reference signal at the local loudspeaker output This may be explained as follows If the reference signal is too low coming into the EF2241 i e the codec audio signal is too low the room audio amplifier is usually used to compensate and bring the room audio to an acceptable level For example if the reference signal is 12 dB too low the room audio will need to be amplified by approximately 12 dB to bring it to a rea sonable listening level This adds 12 dB to the room gain which will most likely cause it to exceed the amplifier room gain limit See Verify Room Gain on page 14 This situation can be remedied by applying enough gain to the codec phone or program audio inputs Inputs A D which will make up the Reference input signal so that the acoustic echo canceller AEC sees a good reference sig nal rather than trying to compensate at the amplifier 2 Another common cause of room gain failure is excessive microphone amplifica tion For example if a microphone is hot by 6 dB then the reflections of the loudspeaker output signal which are picked up by the microphone will be ampli fied by 6 dB more than necessary This adds 6 dB to the room gain which may be sufficient to cause room gain problems This situation could easily arise if for example the conferencing equipment is set up so that participants are too far from the microphone In such a situatio
49. have put their signals on the Bus Polycom Inc 23 VORTEX EF2241 Reference Manual THE BUS THE EF BUS The EF Bus is a high speed low delay digital bus that includes the W X Y and Z audio busses the P bus as well as the echo canceller bus reference and remote control information for other EF devices It can link up to 8 Vortex devices The W X Y Z busses include NOM information and be used for sharing microphone inputs or for sharing mono or stereo program information On the EF Bus page in Conference Composer the inputs coming in to each submatrix labelled WBO WB1 WB7 correspond with the device ID of the bus that is transmitting The denotes Bus The submixes themselves denoted as WM1 WM2 are mixes that are input into the main matrix The denotes Mix The P Bus The P Bus is provided specifically to allow devices to share digital phone audio from the EF2241 The EF2241 can both transmit and receive signals on the P bus while the EF2280 can only receive signals from the P bus C rosspoint Mix Minus Bus Each Vortex device in the system can create four output mixes W X Y and Z and place them on the bus Each device also can create three input mixes each from the W X Y and Z busses of the other devices for a total of 12 mixes The mixes can have crosspoint gains on the signals from the other devices See Figure 15 below 12 mixes become inputs to th
50. he user to disconnect the equipment Users should ensure for their own protection that the electrical ground connections of the power utility telephone lines and internal metallic water pipe system if present are connected together This precaution may be particularly important in rural areas Caution Users should not attempt to make such connections themselves but should contact the appropriate electric inspection authority or electrician as appropriate EF2241 Reference Manual 46 Technical Support 800 932 2774 TECHNICAL SPECIFICATIONS Australia NOTE NOTICE The Ringer Equivalence Number REN assigned to each relevant termi nal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface The termination on an interface may consist of any combination of devices subject only to the requirement that the sum of the Ringer Equivalence Numbers of all the devices does not exceed 5 The term before the certification registration number only signifies that the Industry Canada technical specifications were met Mains powered Voice Telephony without Emergency 000 dialing Warning This equipment will be inoperable when mains power fails 3 PHUBRESERRESREMAHBRS lt 7 5 CBR 4 AU X IBS SBLIBKENSCEPHVET Rest of World EMC CLASS A
51. i n Polycom Ltd declara que este EF2241 cumple los requisitos esenciales y otras cl usulas importantes de la directiva 1999 5 CE verensst mmelsef rklaring Polycom Inc 47 VORTEX EF2241 Reference Manual Polycom Ltd f rklarar h rmed att denna EF2241 verensst mmer med de v sentliga kraven och vriga relevanta stadganden i direktiv 1999 5 EG VORTEX EF2241 Reference Manual 48 Technical Support 800 932 2774 CONFERENCE SYSTEM DESIGN CONFERENCE SYSTEM DESIGN Noise and Reverberation Consider Room Gain Good audio or video conferencing is more than acoustic echo cancellation Before installing the EF2241 you should consider how your whole conference system will work together The goals of conference system design are the following Transmit intelligible speech e Reproduce received speech intelligibly e Prevent echoes nterface properly with transmission equipment High quality program audio ntelligible sound reinforcement if needed Intelligibility can be affected by noise and reverberation Noise comes from various sources such as HVAC computers projectors or traffic Some ways to improve the Signal to Noise Ratio SNR in your system include placing microphones closer to the talkers using electronic noise cancellation and applying acoustical treatments The 2241 is a great way to reduce noise in your system and improve the SNR Poly com s patent pending noise cancellatio
52. irman M ode Enables or disables Chairman Mode for the specified auto mixer Chairman Mic Sets the Chairman Microphone for the specified automixer Last Mic On Mode Sets Last Mic On mode for the specified automixer Last Mic Number Sets the microphone number that will remain on when Last Mic On mode is set to manual Setting this value to 0 will cause the automixer to leave the last open microphone on The last microphone number is specified for each automixer but is only used in manual Last Mic On mode Local Max NOM Sets the maximum number of open microphones NOM limit for the specified automixer This NOM limit is a local limit meaning that this limit applies only to the specific Vortex device that it is set on Global M ax Sets the global maximum number of open microphones NOM limit for each linked automixer The maximum value for this command is 64 This NOM limit is a global limit meaning that this limit applies to all linked automixers with the same Bus ID Off Attenuation Sets the Off Attenuation in dB for the specified automixer Setting this value to 18 would result in the microphone signals being attenuated by 18 dB when gated off This value is set independently for each of the auto mixers Automixer Reference When enabled the echo canceller reference becomes a muted input in the automix so that far end audio coming from the speakers does not gate on local microphones Reference Bias Adju
53. ith a FACTORY PRESET Presets 0 15 change it to match your envi ronment and then save it within the EF2241 as a USER PRESET Presets 16 47 Once you ve saved a USER PRESET set the POWER ON PRESET to that USER PRESET or Polycom Inc 11 VORTEX EF2241 Reference Manual INSTALLATION whichever preset you want to come up after power up The unit will need to be con figured for your system PROGRAM PARAMETERS FACTORY DEFAULT PRESET VALUE SYSTEM PARAMETERS Preset 0 Device ID 0 AUTOMIX PARAMETERS Chairman Mode Off Decay Time 1000 ms Hold Time 500 ms Last Mic On Mode On on Automixer 1 Max NOM per Automixer 4 Off Attenuation 15 dB INPUT CHANNELS Acoustic Echo Cancellation On Automatic Gain Control AGC On AGC Rate 1 dB s AGC Max Gain 3 dB AGC Min Gain 3 dB Automixer 1 Echo Canceller Referenc Refl Filtering Off Gate Priority 1 Adaptive Threshold 10 dB Gate Threshold Adaptive Gating Auto VORTEX EF2241 Reference Manual 12 Technical Support 800 932 2774 INSTALLATION Presets and Multiple Vortex Devices PROGRAM PARAMETERS FACTORY DEFAULT PRESET VALUE Input Gains Mic Mode 15 dB 48 dB for Inputs 1 4 0 dB for Inputs A D anual Threshold 60 dB ute Off Noise Cancellation On Noise Cancellation Level 10 dB Phantom Power On OUTPUT CHANNELS Mute Off
54. lated based on the number of open microphones for each signal that is in the output Output Delay Enable This allows you to enable delay to each of the outputs Output D elay Sets the amount of delay on the output The default value is 0 ms The range is 0 to 340 0 ms in 0 1 ms increments Dynamics Processing Enables or disables compression on Output T These parameters configure how the Vortex device automatic microphone mixer operates Parameters include the following DECAY TIME HOLD TIME CAMERA GATING THRESHOLD BUS ID CHAIRMAN MODE CHAIRMAN MIC LAST MIC ON MODE LAST NUMBER LOCAL NOM GLOBAL NOM OFF ATTENUATION AUTOMIXER THRESHOLD TYPE GATING MODE ADAPTIVE Polycom Inc 31 VORTEX EF2241 Reference Manual LCD MENU STRUCTURE THRESHOLD MANUAL THRESHOLD and GATE PRIORITY Signal Level Channel turns on when signal level isabove Adaptive Threshold ADAPTIVE THRESHO bD fr Microphone Channel OFF Channel ON 17 N iere FF ATTENUATION Ambient Level Figure 22 Automixer parameters Global Settings Decay Time Decay time is the amount of time the microphone audio takes to ramp down to the Off Attenuation level after Hold Time Decay Time values Automixer D range from 0 to 5000 msec The default value is 1000 msec Hold Time This is the amount of time the microphone stays On after the energy Global Settin gs 7 in the channel dr
55. malfunctioning and that if the registered equipment is malfunctioning the use of such equipment shall be discontinued until the problem has been corrected Polycom Inc 45 VORTEX EF2241 Reference Manual TECHNICAL SPECIFICATIONS REN Automatic Dialing Telco Connector Canadian Telco Requirements Tf in the unlikely event that this equipment causes harm to the network the tele phone company will notify you in advance that temporary discontinuance of ser vice may be required But if advance notice isn t practical the telephone company will notify you as soon as possible Also you will be advised of your right to file a complaint with the FCC if you believe it necessary The telephone company may make changes to its facilities equipment operations or procedures that could affect the operation of the equipment If this happens the telephone company will provide advance notice so you can make the neces sary modifications to maintain uninterrupted service The REN is used to determine the quantity of devices that may be connected to the telephone line Excessive REN s on the telephone line may result in the devices not ringing in response to an incoming call Typically the sum of REN s should not exceed five 5 0 To be certain of the number of devices that may be connected to a line as determined by the total REN s contact the local telephone company WHEN PROGRAMMING EMERGENCY NUMBERS AND OR MAKING TEST CAL
56. n after correct microphone setup the local microphone audio level may be too low because of the distance from the EF2241 Reference Manual 40 Technical Support 800 932 2774 TROUBLESHOOTING In Conference Quick Check Excessive Microphone Amplification talker to the microphone The microphone audio will most likely also be muddy and reverberant The installer or user may try to solve these microphone audio quality problems by turning up the microphone amplification thus adding to the room gain This problem can be remedied by proper microphone selection pickup pattern directionality and placement coupled with proper microphone input calibration 3 Athird common cause of room gain problems is excessive coupling between loudspeaker audio and microphones This can be addressed by reducing the microphone coupling either by positioning microphones so that their pickup pat terns are biased away from the loudspeaker audio and direct reflections of loud speaker audio repositioning loudspeakers or reducing the loudspeaker amplification In summary any amplification applied between the reference input and the micro phone inputs can add to room gain problems To avoid problems ensure that the Ref erence input signal is not too low and the microphone input signals are not too high Run the built in EF2241 Room Gain test to verify that you do not have room gain problems See Verify Room Gain on page 14
57. n 1 4 T AGC M aximum In 1 4 T Minimum In 1 4 T Gain Level M ic Line In 1 4 Mute Noise Cancellation In 1 4 T Noise Cancellation Level In 1 4 T Phantom Power In 1 4 Reference Assign In 1 4 AEC Suppression In 1 4 Line Echo Cancellation In T Dynamics Processing In T LEC Suppression In T Figure 19 EF2241 Inputs submenu The input menu allows the user to adjust functions related to the input signals to the EF2241 This menu contains ACOUSTIC ECHO CANCELLATION AUTOMATIC GAIN CONTROL AGC MAXIMUM AGC MINIMUM GAIN ADJUST LEVEL MIC LINE MUTE NOISE CANCELLATION NOISE CANCELLATION LEVEL PHANTOM POWER REFERENCE ASSIGN and AEC SUPPRESSION The menu is organized around the Inputs 1 4 and A D so that you first select an input and then select settings for that input You can also choose to apply the settings to all Inputs Inputs 1 4 or Inputs A D Acoustic Echo Cancellation This allows you to enable or disable the acoustic echo canceller on a particular channel The default is On Automatic Gain Control Inputs 1 4 T This enables automatic gain con trol AGC on Inputs 1 4 and T The default is On AGC Max Inputs 1 4 T Sets the maximum gain value that the AGC can apply for Inputs 1 4 and T AGC Min Inputs 1 4 T Sets the minimum gain value that the AGC can apply for Inputs 1 4 and T Gain This parameter adjusts the gain level of the 8 inputs This i
58. n algorithm included in the EF2241 removes up to 10 dB of ambient background noise and improves perceived quality as well as intelligibility Reverberation in a conference system can reduce intelligibility in a room To reduce reverberation and increase intelligibility use directional microphone and loudspeak ers place microphones closer to the talker and use acoustical treatment When planning your conferencing system you should also consider the room gain that will occur as a result of your microphone and loudspeaker placement Room gain refers to the relative level of the audio going to your amplifier remote end speech or telephone speech and the level of this audio being picked up by the microphone We recommend a room gain of 0 dB or less for the best results But for difficult acoustic environments the EF2241 as well as any of the EF products can handle up to 10 dB room gain which means that it offers great flexibility in your conference system design To help you measure room gain the EF2241 includes a room gain detector You should check your room gain after you have set up the EF2241 D gt Room Gain 20 log B A Figure 29 Room Gain Polycom Inc 49 VORTEX EF2241 Reference Manual EF2241 BLOCK DIAGRAM EF2241 BLOCK DIAGRAM 9SION sng zu LY uo H
59. ncluding W X Y and Z bus ses Set the EF Bus Reference in the System Menu of the LCD Menu See Bus Reference on page 28 Setting up the If all far end audio and program audio sources are on the same Bus Reference Vortex device 1 Assign far end audio and program audio sources to Reference 1 on the originat ing device 2 Onthe EF Bus page in Conference Composer for the originating device set the Exported Signals to REFERENCE 1 Only one device can put an echo canceller reference on the EF Bus as the Bus Reference 3 Onall linked devices set the echo canceller reference to BUS For example a system uses 1 EF2241 1 EF2280 and 1 Polycom VS4000 video codec The Reference 1 is set up on EF2280 with ID 0 The Matrix for this EF2280 in Conference Composer is shown in Figure 10 and the EF Bus page in Figure 11 Conference Composer will not allow more than one device assign their echo canceller reference as the Bus Reference Notice that the phone audio and VS4000 inputs are both assigned to Reference 1 on the originating EF2280 The Matrix for any linked devices is shown in Figure 12 Dp pe f ale 55 5 m LILLE 7 ddaa Wi R2 Mom om eo ec e 2 3 5 n On On On On On On Efeu ERR X X Bz x3 xa 3 87 5 M XN
60. nd 4 inches 102 mm behind the unit for proper ventilation Equipment should not be installed in the rack such a way as to interfere with the ventilation of the EF2241 Caution Consideration should be given to the connection of the equipment to the supply circuit and the effect that overloading of circuits could have an overcurrent pro tection and supply wiring Appropriate consideration of equipment nameplate ratings should be used when addressing this concern Caution Reliable earthing of rack mounted equipment should be maintained Particular attention should be given to supply connections other than direct connection to the Branch use of power strips EF2241 Reference Manual 54 Technical Support 800 932 2774 WARRANTY INFORMATION WARRANTY INFORMATION What is covered For how long What we will do Limitations What we ask you to do Any defect in materials or workmanship Two years If your Vortex EF2241 product is defective and returned within two years of the date of purchase we will repair or at our option replace it at no charge to you If we repair your Vortex product we may use new or reconditioned replacement parts If we choose to replace your Vortex product we may replace it with a new or recondi tioned one of the same or similar design The repair or replacement is warranted for either a 90 days or b the remainder of the original two year warranty period whichever i
61. nnector ec aio cate anne ea RE 51 Connecting Unbalanced RCA to Balanced Mini 99 53 Making EF Bus 53 NOLES 54 Warranty Information susc Goa taut 55 Dehmtuomob att ue eate eot 57 nee rs Er 60 Polycom Copyright 2002 1 Technical Support 800 932 2774 INTRODUCTION INTRODUCTION Welcome Congratulations on your purchase of the Vortex EF2241 How to Use This This is a reference manual for your EF2241 It is structured to provide the informa Manual tion you need quickly and conveniently The following is an overview of each sec tion Introduction Pre Installation includes information about the contents of the box tools needed for installation and front and rear panel descriptions e Installation covers connections of inputs outputs and calibration of inputs of the 2241 Integrating the EF2241 Into Your System describes adjustments to take into con sideration when integrating the EF2241 with surrounding equipment in your sys tem LCD Menu Structure describes an overview of the LCD menu structure and also gives a system overview of features and options available Troubleshooting helps to debug problems with installation Technical Specifications provides the techni
62. o the top through menu through menu and allows you to of the next high of the menu struc the value of a parameter items at particular level or decreases the value of a parameter items at particular level or increases select and change parameter values est level of menus ture Table 2 Summary of button functions on the EF2241 The EF2241 has five menu buttons on the front panel for navigation in the menu tree Press the HOME button from anywhere in the menu tree to return to the top of the menu The ENTER button enters the menu and the ESC button returns to the next high est level of menus To scroll back through menu items at a particular level use the DOWN button To scroll forward through menu items at a particular level use the UP button To adjust a parameter first locate the parameter by scrolling to the appropriate menu with combinations of the UP DOWN and ENTER buttons The display will show the parameter field and the parameter value To change the parameter the parameter EF2241 Reference Manual 26 Technical Support 800 932 2774 LCD MENU STRUCTURE must be flashing To make the parameter flash assuming the front panel 15 not locked press ENTER Once the parameter is flashing use the UP and DOWN buttons to adjust the parameter value The parameter is instantly updated while it is being adjusted you should hear changes as the parameter is changing RS 232
63. ommand is 64 This NOM limit is a global limit meaning that this limit applies to all linked automixers with the same Bus ID Off Attenuation Sets the Off Attenuation in dB for the specified automixer Setting this value to 18 would result in the microphone signals being attenuated by 18 dB when gated off This value is set independently for each of the auto mixers Channel Settings Automixer Inputs 1 4 This allows you to select which automatic microphone mixer 1 or 2 a particular microphone channel is assigned to A microphone may only be assigned to automatic mixer 1 automatic mixer 2 or neither but not both Threshold Type Sets adaptive or manual automatic gating thresholds per input The default is adaptive Gating M ode Sets the automixer gating control mode for specified input chan nel The possible modes are Normal Gating Microphone Forced On or Micro phone Forced Off Adpative Threshold This is also referred to as the Adaptive Threshold This allows you to determine when to gate a microphone on based on an estimate of the background noise level The default value is to gate a channel on if it is more than 10 dB louder than the background noise level Values range from 0 to 100 dB To set the Adaptive Threshold scroll through the Adaptive Threshold range and select the desired Adaptive Threshold by pressing ENTER Manual Threshold Sets the automixer gating threshold for the specified input channel This value i
64. only needs to be selected the first time or when the country of the installa tion is changed DEVICE IDs THE EF Bus When considering which Device IDs can be used for which Vortex device decide how many devices have the ability to transmit on the W X Y and Z busses and how many have the ability to transmit on the P Bus The EF2280 for example can only transmit on the W X Y and Z busses while the EF2241 can transmit on the W X Y and Z busses as well as the P bus Up to 8 devices can transmit on the W X Y and Z busses Similarly up to 8 devices can transmit on the P bus Note that the EF2241 counts as one of both types devices that can transmit on W X Y and Z must have unique device IDs Vortex devices of the same type must have unique device IDs If the device IDs of linked Vortex devices the same the front panel LCD screen will display EFBus Error Dev ID Conflict CONNECTING MULTIPLE VORTEX DEVICES Up to 8 Vortex devices in combination can be linked together at one time See Device IDs on the EF Bus above Each unit in the chain must have a unique Device ID Use the EF Bus to link multiple Vortex devices together The following steps should be followed to connect the EF Bus 1 Setaunique Device ID for each Vortex device The Device IDs range from 00 to 07 2 Power off all units 3 Connect the RS 232 remote control device to any Vortex device in the chain 4 Connect the provided
65. ops below the gating threshold The default value is 500 msec The range is 1 to 5000 msec Microphone channels gating On and Off too fre quently during short pauses in speech might be the result of setting the Hold Decay Time too low while too many microphones gating on at the same time may be the result of Hold Time values that are too high Hold Time Camera Gating Threshold Specifies the hold time for camera gating informa Camera Gating tion Threshold VORTEX EF2241 Reference Manual 32 Technical Support 800 932 2774 LCD MENU STRUCTURE Mixer Settings 2 Bus ID Chairman M ode Chairman M ic Last M ic On M ode Last M ic Number Local M ax NOM Global Max NOM Off Attenuation Automixer Reference Reference Bias Automixer Channel Settings _ Inputs 1 4 E Automixer Threshold Type Gating M ode Adaptive Threshold M anual Threshold Gate Priority Mixer Settings Bus Mixer This command is used to assign one of the two internal automixers to one of the EF Bus automixer groups For example consider three Vortex devices each of which has 2 microphones assigned to Automixer 1 and 2 micro phones assigned to Automixer 2 Now if each of these devices sets their Auto mixer 1 to have Bus Mixer 5 then the three automixers one from each device will work as a single automixer containing 6 3 x 2 microphones Setting Bus Mixer to 0 means that the automixer is not grouped on the EF Bus Cha
66. ower On Preset Choose the EF2241 Preset for power up Acknowledgement M ode This command controls whether or not status mes sages are sent EF Bus Reference This designates which EF2241 device when multiple devices are linked together will put one of their echo canceller references on the EF bus to be used as the EF bus reference Error M essages Turns error messages On or Off Front Panel Lock Locks or unlocks the front panel When the front panel is locked you can see the parameters but you cannot change them The default passcode is aspi case 18 important Front Panel Passcode Once the device has been unlocked the passcode may be changed At the FRONT PANEL PASSCODE menu press ENTER and then enter a passcode and press ENTER until you reach the end of the screen Device ID Selects the Device ID of the unit Baud Rate Selects baud rate of the RS 232 Flow Control selects flow control between Hardware None or Auto LCD Contrast Controls the contrast level of the front panel liquid crystal display LCD Higher numbers result in darker characters on the display lower numbers result in lighter characters M eter Selects which signal is displayed on the front panel LED meter Non Volatile M emory Lock Controls the non volatile lock feature When the non volatile memory is locked you can query the settings but will get an error 1f you try to change them Non Volatile M emory Password This feature sets or querie
67. phone line level inputs with phantom power on each input Outputs e 24 VDC Phantom Power 4 line level auxiliary inputs with nominal level of 0 dBu 8 line level outputs with default nominal level of 0 dBu e Automatic Gain Control AGC on Inputs 1 4 Remote Control e RS 232 port for remote control e Reconfigurable parallel logic input output EF bus for linking multiple Vortex devices e Digital bus with 5 audio busses 48 kHz sampling rate e Up to 8 Vortex devices can be linked each device providing 4 audio signals on the bus and each EF2241 providing 1 phone audio signal on the bus EF2241 Reference Manual 4 Technical Support 800 932 2774 PRE INSTALLATION PRE INSTALLATION What s Included The Vortex EF2241 product package includes the following items Vortex EF2241 Reference Manual Vortex EF2241 External power supply Cat 5 cable for EF Bus Telephone cable Rack mount screws 4 Phoenix connectors 16 Cable clamp and screw CDROM containing other manuals and Conference Composer software Product Registration Card Rackmount Screws 4 ortex 2241 gt gt VORTEX Cable Clamp y vive enim swa and screw Connectors 16 4 ped CDROM with External Power Supply 1 Cat 5 cable Control software and manuals 59 POLYCOM for EF Bus tmn 1 Telephone cable Vortex EF
68. r of Open Microphones This parameter sets the num ber of open microphones allowed at any time If this parameter is set too low the microphones may not gate as often as you wish Adjust the Adaptive Threshold 1f the Gate Threshold is set to Adaptive or adjust the Manual Threshold if the Gate Threshold is set to Manual For Adaptive Gate Threshold set the Adaptive Threshold lower so that the microphone will gate On when lower level signals are present at the microphone For Manual Gate Threshold set the Manual Threshold to a lower absolute threshold The Hold Time might be too high Too many microphones gating on at the same time may be the result of Hold Time values that are too high Assign a Chairman Mic This will cause all other microphones to gate Off once this microphone gates on and will prevent too many microphones from gating Set Gating Priority so that not all microphones have the same priority The default value for each input is a Gating Priority of 1 which is the highest priority Adjust the Adaptive Threshold 1f the Gate Threshold is set to Adaptive or adjust the Manual Threshold if the Gate Threshold is set to Manual For Adaptive Gate Threshold set the Adaptive Threshold higher so that the microphone will gate when only louder signals are present at the microphone For Manual Gate Threshold set the Manual Threshold to a higher absolute threshold Using the Adaptive Gate Threshold is recommended for more accurate gating
69. room This is a local room phenomenon that gives the talker s voice a hollow or resonant sound as heard at the remote end EF2241 Reference Manual 38 Technical Support 800 932 2774 TROUBLESHOOTING Finding the Source of Echo Room Gain AEC Reverberatign eee Acoustic Echo Figure 27 Reverberation vs Acoustic Echo Reverberation is not an artifact of the echo canceller It is mainly affected by the dis tance of the microphone from the speech source and by the resonances of the room While reverberation can be unpleasant it is not compensated for by the acoustic echo canceller AEC which only removes reflections of remote speech If the remote end complains that they hear echo ensure that they are referring to hearing their own voice and not echoes of local talkers You cannot remove the effects of reverberation by changing the EF2241 s settings but you can minimize reverberation by moving microphones closer to talkers and if necessary adding acoustical treatment to the room Try muting one channel at a time to see if the echo that the remote end is hearing goes away when a particular channel is muted If you find that the echo goes away when a particular channel is muted the microphone may not be calibrated correctly Check one or more of the following issues The most common cause of poor echo cancellation performance is incorrectly adju
70. s longer Polycom shall not be responsible for special incidental indirect or consequential damages resulting from any breach of warranty or under any other legal theory including but not limited to loss of profits downtime goodwill damage to or replace ment of equipment and property and any cost of recovering reprogramming or reproducing any program or data stored in or used with Vortex products Some states do not allow limitations on how long an implied warranty lasts or the exclusion of incidental or consequential damages so the above exclusions or limita tions may not apply to you To obtain warranty service for your Vortex product call us at 800 932 2774 or fax us at 404 892 2512 and we will issue a Return Material Authorization number RMA Use the original packaging materials to return the product Ship the product prepaid to Polycom Installed Voice Business Group Attention Warranty Repair RMA Must on package 1720 Peachtree Street NW Suite 220 Atlanta Georgia 30309 2439 USA Please be sure to include your name company address phone number and a descrip tion of the problem After repairing or replacing your Vortex product we will ship it to you via a surface carrier of our choice at no cost to you If you wish it shipped via a specific carrier at your cost you must arrange it when you obtain the RMA Repair or replacement of your Vortex product is your exclusive remedy Polycom Inc
71. s normally config ured during the calibration process The default setting is 15 dB for microphone signals and 0 dBu for line level signals See Level above for setting mic line level for Inputs 1 4 The LEVEL INDICATOR on the front panel automatically reflects the level of the channel whose gain is being adjusted Level Use this parameter to select mic or line level on Inputs 1 4 Mute This selects which input channel 1 4 A D or the W X Y or Z input is muted The default is not muted Noise Cancellation Inputs 1 4 T This allows you to enable or disable noise cancellation Noise Cancellation Level Inputs 1 4 T Selects the level of noise can cellation This ranges from 0 to 15 dB The default is 10 dB Phantom Power Use this parameter to turn phantom power On or Off for inputs 1 4 Echo Canceller Reference This parameter decides which reference is associ ated with which zone Choose between REF1 REF2 or the external bus reference AEC Suppression Sets the amount of double talk suppression used in the AEC The values correspond to the following settings 1 No Suppression 2 Light Sup pression 3 Heavy Suppression 4 Half Duplex Line Echo Cancellation Enables or disables the echo cancellation on the phone line Dynamics Processing Enables or disables compression on Input T LEC Suppression Sets the amount of suppression used the line echo canceller LEC VORTEX EF2241 Reference Manual 30
72. s only used if the input set to Manual Gating via the THRESHOLD TYPE option Gate Priority The priority of each microphone can be assigned a value ranging from 1 to 4 Priority 1 microphones have priority over priority 4 microphones for gating The default is to have all microphones set to priority 1 If Chairman Mode is enabled all microphones including ones with priority of 1 will be gated off when the Chairman mic gates on AUTOMIXER SETTINGS FOR MULTIPLE VORTEX DEVICES When using more than one Vortex device in your room system you have several pos sibilities for how you configure the automixer Each device can operate as one of the following One automixer independent of other devices linked to it Two automixers independent of other devices linked to it One large automixer sharing automixer functions with other devices linked to it Two large automixers sharing automixer functions with other devices linked to it m Automixer ine gt Off p ps IUE 14 ail Last Open Chairman 1 a dB E Jm Local Max NOM Default to Attenuation Bus Mixer Global Max NOM ps Off FR P P 2 E Last Open Chairman 2 24 dB EH Local Max NOM Default to Attenuation Bus Mixer Global Max NOM Figure 14 Vortex Automixer Settings in Conference Composer Software Polycom Inc 21 VoRTEX EF2241 Reference Manual INTEGRATING THE 2241 INTO YOUR SYSTEM Automixer and Bus
73. s the non vola tile lock password This password is used in conjunction with NON VOLATILE MEM ORY LOCK The default password is aspi case is important Screen Saver Enables or disables the screen saver on the LCD panel You can also set the idle time Last Restored Preset Displays the last restored Preset Software Version Queries the software version Reboot EF2241 Cycles power on the EF2241 VORTEX EF2241 Reference Manual 28 Technical Support 800 932 2774 LCD MENU STRUCTURE PHONE CONTROL Phone Control Auto Answer Auto Hangup Call Progress Auto Hangup Loop Drop Country Select Dial Tone Gain DTMF Gain Ring Tone Enable Figure 18 EF2241 Phone Control sub menu Auto Answer Enables or disables auto answer Auto Hangup Call Progress Enables or disables auto hangup based on call progress messages Auto Hangup Loop Drop Enables or disables auto hangup cased on loop drop Country Select Selects the country where you are using the unit This must be set before you can use the unit and does not need to be set again unless you use the unit in a different country Dial Tone Gain Adjusts the gain of the dial tone DTMF Gain Adjusts the gain of the DTMF tones Ring Tone Enable Enables or disables ring tones Polycom Inc 29 VORTEX EF2241 Reference Manual LCD MENU STRUCTURE INPUTS Inputs 1 4 T A D Acoustic Echo Cancellation In 1 4 Automatic Gain Control AGC I
74. se the Output Gain of the microphone 3 OR adjust the placement of the microphone relative to the loudspeaker Room Gain M eter Read Room Gai from here Figure 8 Room Gain Meter on the Diagnostics page of the Conference Composer control software Set the gains on the matrix mixer inputs from the program audio sources so that pro gram audio is played into the room at a level similar to that of speech from the remote site This should also ensure that the program audio levels are good when sent to the remote site EF2241 Reference Manual 14 Technical Support 800 932 2774 INTEGRATING THE EF2241 INTO YOUR SYSTEM INTEGRATING THE EF2241 INTO YOUR SYSTEM Operating the EF2241 INPUT SETTINGS Set Inputs 1 4 for Mic or Line Level Select Phantom Power for Inputs 1 4 CALIBRATION Set Mic Line Input Channel Gains The EF2241 can be operated in two ways through the LCD menu on the front panel or through RS 232 For control via RS 232 please refer to the EF2241 Programming Guide which includes programming tips as well as the EF2241 RS 232 commands For operation using the PC control software Conference Composer please refer to the Conference Composer User Guide Use Conference Composer software to easily configure the EF2241 with a PC or refer to the Applications Guide for different configurations that are already pro grammed into factory presets Configure Inputs 1 4 for mic or line level
75. sted room gain This may be explained as follows The reference signal seen by the AEC is sent to a loudspeaker output where it is amplified and sent to the room loudspeakers The loudspeaker audio is coupled into the room microphones acousti cally through direct and reflected acoustic paths and perhaps also through mechani cal coupling The microphone signal is then amplified and sent to the AEC as the local microphone input signal The room gain of a microphone channel refers to the relative levels of the signal sent to the loudspeaker output before any amplification Polycom Inc 39 VORTEX EF2241 Reference Manual TROUBLESHOOTING and the level of this signal that is reflected as the microphone input after microphone amplification ERE AEC Room Gain 20 log B A Figure 28 Room Gain If the electrical level of the reflected signal picked up by microphone is the same as the level of the electrical signal sent from the AEC to the loudspeaker output the room gain of this microphone channel is said to be 0 dB If the reflected signal picked up by the microphone is higher than the level of the signal sent to the loudspeaker out put that microphone channel has positive room gain The more positive the room gain the harder the AEC must work to determine which signal is an echo and which is a local speech signal Excessive Room Excessive room gain can be caused through a number of mec
76. sts how much gain is applied to the Automixer Reference signal The higher the gain the harder it will for local talkers to gate on a micro phone Channel Settings Automixer Inputs 1 4 This allows you to select which automatic microphone mixer 1 or 2 a particular microphone channel is assigned to A microphone may only be assigned to automatic mixer 1 automatic mixer 2 or neither but not both Threshold Type Sets automatic also referred to as adaptive or manual auto matic gating thresholds per input Gating Mode Sets the automixer gating control mode for specified input chan nel The possible modes are Normal Gating Microphone Forced On or Micro phone Forced Off Adaptive Threshold This is also referred to as the Adaptive Threshold This allows you to determine when to gate a microphone on based on an estimate of the background noise level The default value is to gate a channel on if it is more than 10 dB louder than the background noise level Values range from 0 to 100 dB To set the adaptive threshold scroll through the adaptive threshold range and select the desired adaptive threshold by pressing ENTER Manual Threshold Sets the automixer gating threshold for the specified input channel This value is only used if the input set to Manual Gating via the THRESHOLD option Polycom Inc 33 VORTEX EF2241 Reference Manual LCD MENU STRUCTURE Gate Priority The priority of each microphone can be
77. t in the default mode all linked devices will work together as one complete automixer CONFIGURE THE MATRIX MIXER The matrix mixer allows arbitrary crosspoint gains in 1 dB increments between any input and output signal If you have a PC use the Conference Composer software See the Conference Com poser User Guide to set the matrix parameters If you would like to set matrix parameters from the LCD menus see Matrix Menu on page 34 for descriptions and instructions on setting matrix mixer parameters BUILDING YOUR SYSTEM WITH MULTIPLE VORTEX DEVICES The following is a checklist for building a system with mutliple devices l Assign Inputs 2 Assign Outputs 3 Configure submatrix the EF Bus 4 Configure your echo canceller reference EF2241 Reference Manual 22 Technical Support 800 932 2774 INTEGRATING THE EF2241 INTO YOUR SYSTEM 1 Assign Inputs Assign each audio source to an input Remember to include the conferencing equip ment such as a video codec and any program audio 2 Assign Outputs Try to assign as many outputs as you can to one Vortex device to make a simpler sub matrix Remember that Outputs 1 4 can also be used as outputs of the matrix The bussing gets more complicated 1f you choose to spread your outputs over several units 3 Configure the To link multiple devices together use the submatrix on the EF Bus to configure submatrix which signals to receive from other devices that
78. ted warranty gives you specific legal rights and you any have other rights that may vary from state to state EF2241 Reference Manual 56 Technical Support 800 932 2774 DEFINITION TERMS DEFINITION OF TERMS Acoustic Echo Acoustic Gain Ambient Level Automatic Gain Control AGC Automatic Microphone Mixer Convergence Rate Crosspoint Mix Minus Bus Echo Canceller Acoustic echo occurs in a conferencing or distance learning system when the remote speech played in the loudspeakers is picked up by microphones in the room and is transmitted back to the remote end This transmitted signal is a delayed version of the original which causes the echo Acoustic gain is a term used in conjunction with sound reinforcement It refers to how much louder the audio is with sound reinforcement compared to without sound reinforcement The ambient level also referred to as noise floor 1s the background noise heard in a room when no one on the near or remote end is talking Automatic gain control increases or decreases the gain on an audio signal to an acceptable value A microphone mixer that turns microphone channels on and off based on the signal level going into the microphone Convergence rate refers to the amount of echo a line or acoustic echo canceller can cancel per unit time typically expressed in dB sec Better echo cancellers have a higher faster convergence rate This term is typically used to
79. th Assign all microphones to the same automixer when using all microphones in the same room but in different zones so that a person does not activate microphones in two different zones which they would tend to do if each zone had its own automatic mixer Use both automatic mixers when the EF2241 15 split to operate independently between two rooms One automatic mixer is used in each room The advantage of having two independent automatic mixers is that when used in two rooms micro phone signals in one room do not affect the gating behavior of microphones in the other room Set an input channel to use neither automatic mixer if an input 15 not actually a microphone but is a program audio input For instance if you only have 6 microphones and you have an extra stereo program audio source that you want auto matic gain control AGC on and or noise cancel you could set its channels to be on neither automatic mixer If you have a PC use the Conference Composer software See the Conference Com poser User Guide to set the automixer parameters If you would like to set automixer parameters using the LCD menus see Automixer Menu on page 31 for instructions on setting automixer parameters The following parameters configure how the EF2241 automatic microphone mixer operates Parameters include the following Decay Time Hold Time Camera Gating Threshold Chairman Mode Chairman Mic Last Mic On Mode Last Mic Number Polycom Inc
80. tio of the microphone signal which is analogous to raising the background noise level in the room Because this noise is uncorrelated with the echoes within the room the EF2241 s ability to adapt and cancel echoes will be less than optimal A second effect of insufficient microphone gain is that the power of the microphone input signal may be substantially lower than that of the remote input signal This reduces the ability of the decision logic to determine whether the AEC should be in transmit receive or double talk mode This effect may reduce the effectiveness of the EF2241 in canceling echoes You can check for insufficient microphone amplification by observing the front panel LEVEL INDICATOR during normal conferencing conversation The first yellow LED should illuminate frequently If the LEVEL INDICATOR never illuminates beyond one or two green LEDs during normal speech increase the microphone s input level Note Before you readjust the microphone input levels check to make sure you are looking at the correct channel on the LEVEL INDICATOR Note If you adjust the M iC LiNE INPUT level you will affect the room gain Check to make sure that the room gain limit is not exceeded See Room Gain on page 39 Overdriving the loudspeaker or inserting a dynamics processor before the EF2241 may distort the signal that the microphones see causing ineffective AEC operation The EF2241 relies on the linearity of the acoustic feedback path
81. tomixer Camera Gating Threshold 20 32 Automixer Chairman Mic Mode 12 20 21 33 34 37 Automixer Decay Time esee eene tentent 12 20 31 32 Automixer Gate Priority eese eet tnnt 12 21 34 37 Automixer Gating Mode 21 33 Automixer Global Max NOM sese 20 33 Automixer Hold Time eoe o Reise satus 12 20 32 37 Automixer Last Mic On 12 20 33 Automixer Local Max 2002 0 2 400000 20 33 Automixer Manual Threshold sss 13 21 33 37 Automixer Off Attenuation 12 20 33 Automixer Off Atteunation 22000 nes 21 Automixer Threshold Type 21 33 B 20 22 33 15 Compliance hd diy lace esae tota aot 45 Conference Composer 5 14 15 18 19 22 M A 25 D Device 10 12 Digital 2 4 24 58
82. twisted pair cable The total distance of the EF Bus should be less than 4 5 m The EF Bus must be connected so that the EF Bus In of one box 1s connected to the EF Bus Out of another Connecting the EF Bus In to another EF Bus In or Out to Out will not work Cat 5 Plug Pinout 1 White Orange 2 Orange 3 White Green 4 Blue 5 White Blue 6 Green 7 White Brown 8 Brown Plug Pinout 3 Ring 4 Tip Note Other pins are not connected The DAA is not affected by Tip and Ring wiring reversal RS 232 Port 9600 19200 38400 8 N 1 RS 232 port is wired as DCE It accepts a male DB 9 connector Only pins 2 3 and 5 are required by the EF2241 but pins 7 and 8 are supported Con nect pins straight through do not use null modem DCD 2 TXD 3 RXD 4 DSR 5 ground 6 DTR 7 CTS 8 RTS 9 No connection Baud rate is selectable at 9600 19200 or 38400 Polycom Inc VORTEX EF2241 Reference Manual CONNECTOR PINOUTS Input Output Remote Control Port INPUT Logic Input Pins 1 24 are inputs 1 24 respec 13 1 0000000000000 4 tively Pin 25 is ground 1 25 4 REM OTE CONTROL Logic Output Pins 1 20 are outputs 1 20 respec 0000009000000 tively Pins 21 25 are ground Each ground pin should be used with only 4 outputs For example OUTPUT outputs 1 4 could be connected to LEDs which are connected to ground pin
83. uctor terminal block 1 Connect RCA Tip to Phoenix pin 1 2 Connect RCA Ring to Phoenix pin 2 3 Connect Phoenix pin 3 to Shield and leave Shield floating on RCA end Caution Do NOT connect the shield at both ends Caution the EF2241 Phoenix 3 is connected to chassis ground Under no circumstances should Phoenix 3 be connected to pin 1 or to 2 Doing so will add noise to the audio signal MAKING AN EF BUS TERMINATOR 12345678 100 Figure 32 terminator Instructions To make a terminator for use when connecting EF2280s use an RJ45 connector Connect pin 3 to pin 6 with an 110 Ohm resistor terminator is not required for the EF2241 as it is built in Polycom Inc 53 VORTEX EF2241 Reference Manual CONNECTOR PINOUTS ADDITIONAL NOTES Caution Failure to use all four screws to attach the EF2241 to the rack may result n uneven loading and cause a safety hazard Caution Ensure that the power supply is securely located such that it cannot become dislodged and fall Such a fall could cause personal injury or equipment failure Caution When mounting a EF2241 in a rack consideration should be given to airflow and operating ambient temperatures inside the rack To ensure safe operation of the EF2241 ambient operating temperatures inside the rack should not exceed 40 degrees Celsius Allow 2 inches 51mm of open space in front of the EF2241 2 inches 51mm on either side a
84. using the LCD menu See Level on page 30 or Conference Composer Control Software See the Conference Composer User Guide Turn phantom power On or Off for Inputs 1 4 using the LCD menu See Phantom Power on page 30 or Conference Composer Control Software See the Conference Composer User Guide Phantom power should be turned On for condenser and elec tret microphones When using the factory default Preset 0 the following calibration can be used In Preset 0 Automatic Gain Control AGC is On and the microphone gains on Inputs 1 4 are set to 15 dB The AGC will compensate for the microphone gain If you are using ceiling microphones set the microphone gain to 28 dB Fine tune the Input Gain using the Automatic Gain Control AGC meter on Conference Composer Software In the Conference Composer Software go to the DIAGNOSTICS page Watch the meter labelled AGC while someone is talking into the particular channel that you are adjusting Watch the number in the box at the bottom of the AGC meter See Figure 9 below This is the amount of gain that the AGC is applying The goal is to have the AGC meter on average staying around 0 If the level that you see in the box is negative decrease the input gain by the average number that you see in the box because the AGC is attenuating the chan nel s input gain because the level is too high If the number in the box is positive increase the input gain on that channel because the AGC is
85. vel i e adding 8 dB of gain Configure the matrix mixer output to the codec input The output gain of the matrix mixer should be set to match the nominal input level of the codec For example if the codec accepts 10 dBV 8 dBu inputs 8 dB of attenuation should be applied at the matrix mixer output to the codec Polycom Inc 13 VORTEX EF2241 Reference Manual INSTALLATION Verify Room Gain Configure Program Audio Sources Configure the matrix mixer input from the codec output The input gain of the matrix mixer should be set to match the nominal output level of the codec For example if the codec outputs a 10 dBV 8 dBu level 8 dB of gain should be applied on the matrix mixer input This will bring the codec level up to 0 dBu inside the matrix After adjusting the loudspeaker level verify the room gain in your system using the ROOM GAIN meter on the DIAGNOSTICS page of Conference Composer The Room Gain measurement is only accurate when just the remote talkers are speaking If local talkers are speaking too the room gain meters are not accurate See Figure 8 below The meter shows the room gain which is the relative level of the output level and the input level While the EF2241 will operate in positive room gain conditions the room gain should be around 0 dB or a negative value If you have a positive room gain make adjustments in the following areas 1 Decrease the Input Gain of the microphone 2 Decrea

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