Operation Instruction for TH
Contents
1. 6 CALL IN LINE 2 15 NOT CONNECTED 7 ACTIVE EXTENDER LINE 1 8 ACTIVE EXTENDER LINE 2 Except special versions 9 COMMON GROUND When needed these connections must be carried out only by qualified technical personnel AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender 6 CONTROL FUNCTIONS The TH 02 EX Mk Ill features control functions for selecting the operation mode of each connected line Some of these functions can be executed through a remote control which uses the signals available in the remote control connector All functions are independent for each line In local mode control functions are performed using the keys on the front panel 6 1 Control keys Each line of the TH 02 EX Mk III incorporates a group of keys placed in the front panel with the following assigned functions EX When the keys 1 and 6 are activated the frequency extension function is activated displacing all transmission frequencies 250 Hz upwards and all the reception frequencies 250 Hz downwards For a correct operation of the EX function it must be carried out in the opposite direction at the other side of the line by using another TH 02 EX or an AEQ TLE 02 LOC REM When it is disconnected using the keys 2 or 7 the assigned line operates in local mode and the remote control of the line does not work 2W 4W When it is disconnected using the keys 3 or 8 the assigned line operates in two wire mode2. Quality Assurance System and according to the ISO 9001 2002 Standard AEQ therefore Guarantees that the necessary test protocols to assure the proper operation and the specified technical characteristics of the product have been followed and accomplished This includes that the general protocols for design and production and the particular ones for this product are conveniently documented 1 The present guarantee does not exclude or limit in any way any legally recognized right of the client 2 The period of guarantee is defined to be twelve natural months starting from the date of purchase of the product by the first client To be able to apply to the established in this guarantee it is compulsory condition to inform the authorized distributor or to its effect an AEQ Sales office or the Technical Service of AEQ within thirty days of the appearance of the defect and within the period of guarantee as well as to facilitate a copy of the purchase invoice and serial number of the product It will be equally necessary the previous and expressed conformity from the AEQ Technical Service for the shipment to AEQ of products for their repair or substitution in application of the present guarantee In consequence return of equipment that does not comply with these conditions will not be accepted 3 AEQ will at its own cost repair the faulty product once returned including the necessary labour to carry out such repair whenever the failure is
3. this means as a digital hybrid connected to the normal line T W In two wire mode when pushing the keys 4 or 9 the incoming signal remains in stand by WAIT The caller hears the program but can not take part When the key is released the line returns to the telephone set or on air if the ON AIR switcher is activated In four wire mode the four wire input signal is in telephone mode Likewise the line is in two wire mode ON AIR In two wire mode when the keys 5 and 10 are activated the line is connected to the digital hybrid and the incoming signal is ON AIR this means goes out through the respective PROG OUT connector In four wire mode the incoming signal is ON AIR and so it is available in the respective PROG OUT connector AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender 6 2 Remote mode When the LOC REM key of a line 2 or 7 is activated the function of the control keys EX T W and AIR of that line become available in the remote connector To activate one of those functions from a remote control the only requirement is to connect the respective remote signal to ground Additionally there are two signals in the remote connector RING 1 and RING 2 for recognizing the incoming call tone for each telephone line These signals have the following electric characteristics When the incoming call tone is connected CALL IN SIGNAL 100 ms d dl 20 ms When it is disconnected CA
4. 29991 y Pago N inea une E AEN LAL Sass e du TES TEES 13 14 15 16 17 18 19 20 13 Mains connector 14 Remote control connector 15 RJ 11 connector for Line 2 telephone set 16 RJ 11 connector for Line 2 17 Four wire input output connector for Line 2 18 XLR male connector for Line 2 program output 19 20 21 22 23 XLR female connector for Line 2 program input Key for Multiplex or independent operation RJ 11 connector for Line 1 telephone set RJ 11 connector for Line 1 Four wire input output connector for Line 1 24 XLR male connector for program output to Line 1 or both lines in Multiplex operation mode 25 XLR female connector for input program from Line 1 or both in Multiplex operation mode AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender amp AEQ 9 TECHNICAL SPECIFICATIONS AUDIO INPUTS Program input Transformer balanced Input impedance gt 6 KOhms Nominal input level 0 dBm Four wire input Transformer balanced Input impedance gt 1KOhms Nominal input level 0 dBm AUDIO OUTPUTS Program output Transformer balanced Nominal output level 0 dBm Four wire output Transformer balanced Nominal output level 0 dBm TELEPHONE LINE INTERFACE Input Output Transformer balanced Impedance 600 Ohms Nominal input
5. KHz with nominal input and output levels 0 10 95 0 10 95 TX lt 66 dBm RX lt 68 dBm TX 250 Hz Rx 250 Hz Lower than absolute noise 90 250 V 50 60 Hz 19 rack 1 unit height Width 482 mm 19 Height 44 5 mm 1 75 Depth 356 mm 14 AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender
6. 11 OME COMMUNICATION line ccs terete eoa cb eere Spr Dee a Otto edd 11 7 1 1 Two wire mode Digital hybrid tne 11 7 1 2 Four wire mode Full duplex intercom sess 12 Two communication lines ice ou ete te eto e tr akt X RASA UEM Iu dee 13 3 2 1 Multiconference ITIGde oerte eden nee quete ade c ied 13 7 2 2 Multiplex intercom mide c o a te wr ht e ic en Be sone 14 732 3 Dual mode ccs cerent tree ter RE Pe RE Lee EON e eaaa 14 DESCRIPTION OF FRONT AND REAR PANELS eee 15 PROM Daniel acu cete tc eU o er bebes dte d ent aides esie ues 15 Rear panel D inS 15 TECHNICAL SPECIFICA TIONS snnnnnnnnnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn mannna 16 AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender amp AEQ 1 GENERAL INSTRUCTIONS 1 4 General precautions The following precautions should be observed for safety reasons during all operation and maintenance of this unit Failure to comply with all instructions may seriously alter the functions and performance of the equipment AEQ will not be responsible for any damage or loss due to the improper handling of the equipment 1 1 1 Read all instructions Before connecting the equipment to mains and start up it is absolutely necessary to read carefully all the instructions in this manual in the established order If these basic rules are respected you will obtain th
7. AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender USER S MANUAL ED 10 06 AENOR Et AEQ A E Q S A manufacturer of this equipment is a Registered Company in accordance with UNE EN ISO 9001standard by Aenor with reg nr ER 080 1 96 The CE equipment marking means that it is in compliance with requirements by the Royal Decree 444 1984 published through the Official State Bulletin of Spain on 1 4 84 transposition of the 89 336 CEE electromagnetic compatibility directive and by low voltage directive 73 23 CEE This appliance is connected to telephone networks indirectly through interface amp AEQ IMPORTANT NOTE Since end of 2006 there is a new version of the hybrid board of TH 02 EX mklll unit digital hybrid with frequency extender ED 2 5 06 and ED 3 10 06 editions These boards are compatible with previous version of equipment TH 02 EX mkll but there have been changes regarding board power supply Therefore when you connect a new TH 02 EX 2006 hybrid board on a TH 02 EX mkll unit it s essential to remove J1 J2 and J3 jumpers When this board is connected on a TH 02 EX mklll unit those jumpers must be mounted J2 J3 9 JL aca fem gt ad J S Jat E E a ee 0 J1 AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender 7 2 INDEX GENERAL INSTRUCTIONS dus ie ete eet 3 General precautions seo ere pe E hse e ems an cv ar Ea e nt Hu E 3 1 1 1 Read all instrUcl
8. III Digital Hybrid with Frequency Extender amp AEQ AEQ TH 02 EX Mk IlI digital hybrid The lay out of the equipment operating in two wire mode is the following ENTRADA AL PROGRAMA a oe N PROGRAM INPUT A T i AD gt D A gt v AFIR ECO EL CTRICO gt L NEA TELEF NICA ELECTRICAL ECHO TELEPHONE LINE v lt SALIDA DEL PROGRAMA q ne Pilg OC ee ogg PROGRAM OUTPUT Ace S N The telephone line is connected to the digital hybrid when you select T W or AIR on the keyboard When the function T W is activated and the function AIR not the person calling can listen to the program but can not take part there is not output signal If AIR is selected he can listen and also take part in the program there is output signal 7 1 2 Four wire mode Full duplex intercom When the 2W AW function is activated the AEQ TH 02 EX Mk III operates in four wire mode it means as a full duplex intercom This operation mode is based on the same principles explained in the precedent chapter In this case the AEQ TH 02 EX Mk III cancels the acoustical echo in the remote terminal generated by feed back between the microphone and the speaker when they are both on For better understanding of the four wire operation mode let s think of a typical application The user adjusts the gain of the speaker in such way that the level of the speaker on the remote terminal is the same as the level of the near speaker when he listens to himself As a re
9. LL IN SIGNAL 0 Volts These signals can be used to feed a LED When an incoming signal is detected in the line the LED connected will blink Note Some telephone switchboards can generate exceptionally low incoming call signals much lower than 75 VRMS which the equipment will not detect In this case consult our Technical Service which will give you advice about the required modifications for solving the problem AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender amp AEQ 7 SYSTEM S CONFIGURATIONS 7 1 One communication line If the AEQ TH 02 EX Mk Ill has only one line connected the user can use it in two wire mode as a digital hybrid or in four wire mode as a full duplex intercom 7 1 1 Two wire mode Digital hybrid Operative principles Circuits called telephone hybrids where defined by the telephone companies in order to separate the sent and received signals of a standard two wire telephone pair The isolation between both signals is evaluated using the parameter hybrid rejection or transhybrid loss regarding the amount of electrical echo that can be rejected by the hybrid The higher the rejection is the lower will be the signal sent to the reception circuit The electrical echo besides of being a source of distortion can cause echo on a communication when it is carried out through a long distance link These problems get even worse when you want to implement a teleconference terminal or to join sever
10. Shield Positive Return If a balanced mono channel polarity microphone is B connected to Unbalanced Shield and Positive Note 1 an unbalanced mono channel return polarity amplifier input He pi Balanced Shield and Positive Positive Mie DM 3 of the input mono channel negative polarity return and should be Phantom power power and power power connected to Balanced Shield Positive Negative pin number mono channel polarity return and Power A B and power power 3 1 1 Connection of audio inputs and outputs The TH 02 EX Mk Ill features the following audio connectors Program inputs XLR 3 female connectors for the audio signal inputs to lines 20 and 26 Program output XLR 3 male connector for the signal output from audio lines ON AIR 19 and 25 When the switcher MPLEX 21 in the back panel is ON only input 26 and output 25 will be operative They respectively carry the mixed signal to and from both lines AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender amp AEQ 4 LINE CONNECTION 4 1 General The equipment is in compliance with the 89 336 CEE electromagnetic compatibility directive and with the 73 23 CEE low voltage directive It is connected to telephone networks indirectly through interface Bear in mind that if the equipment is supplied with a single line connectors for line 2 will not be available The TH 02 EX Mk III covers all possible connecting options to standard telephone circu
11. al speakers in a telephone conference Analog hybrids The analog hybrid s operation is based in obtaining the greatest adaptation possible between its balance impedance and that of the telephone line at every moment The only way of obtaining it is measuring the loop of the telephone and connecting a balanced impedance according to the measure This system has two great drawbacks a It does not consider the variations generated by the distant telephone loop nor the variations due to changes of temperature humidity etc b If the system is transferred it will be needed to measure impedance and to balance it again Digital hybrid This model is based on an electrical echo cancellation system generated by a conventional analog hybrid through digital signal processing Using an adaptative digital filter it is possible to analyze the features of the telephone line and adapt the system to them as much as possible The response of the filter is automatically set up to synthesize a signal and obtain one similar to the electrical echo and then subtract it for eliminating the real signal The advantage of this process is that it is fully automatic and so it does not require any measurement or pre adjustment of the system depending on the connected wire pairs Using high resolution digital signal processors it is also possible to reach levels of acoustical echo cancellation high enough to guarantee a real multiconference system AEQ TH 02 EX Mk
12. case of feedback In case you find any feedback reaction in the TH 02 EX Mk III after installation and connection the technician should check in the mixing console that there is no signal sent from the TH 02 EX Mk Illl talkback module to the console module that sends signal to the hybrid 1 2 General description The TH 02 EX Mk Ill is a configurable system which can be used in two wire mode as a digital hybrid or in four wire mode as a full duplex intercom In any of these modes you can take advantage of the frequency extender function According to user s requirements the TH 02 EX Mk III is supplied with one or two lines When the system operates with both lines the user can take advantage of the built in Mix Minus bus Through this bus it is possible to establish a multiplex and full duplex communication between the user and the two lines connected to the hybrid As the user can select the operating mode of each line there are different configurations of the equipment which make the TH 02 EX Mk Ill a highly versatile equipment with a wide range of applications In Section 7 System configuration the user can find detailed information about any of them 2 POWER SUPPLY 2 1 General The description of the front and rear panels of the equipment is described in Section 8 Extend the sheet with the diagrams to obtain a general view and better comprehension of all connections The TH 02 EX Mk Ill is prepared to operate with voltages betwee
13. caused by defects of the materials design or workmanship The repair will be carried out in any of the AEQ authorized Technical Service Center This guarantee does not include the freight charges of the product to or from such Authorized Technical Service Center 4 No Extension of the Guarantee Period for repaired product shall be applied Nor shall a Substituted Products in application of this Guarantee be subject to Guarantee Period Extension 5 The present guarantee will not be applicable in the following situations Improper use or Contrary use of the product as per the User or Instruction Manual violent manipulation exhibition to humidity or extreme thermal or environmental conditions or sudden changes of such conditions electrical discharges or lightning oxidation modifications or not authorized connections repairs or non authorized disassembly of the product spill of liquids or chemical products 6 Under no circumstances whether based upon this Limited Guarantee or otherwise shall AEQ S A be liable for incidental special or consequential damages derived from the use or from the impossibility of using the product AEQ shall not be liable for loss of information in the disks or data support that have been altered or found to be inexact neither for any accidental damage caused by the user or other persons manipulating the product AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender 1 1 6 How to proceed in
14. e maximum performance of the equipment from the very start and at the same time you will avoid incorrect or improper operation that could cause damage to the equipment or personnel 1 1 2 Water and humidity The operation of the equipment in humid environments near water or wet floors must be avoided Nor should it be used in environments where the atmospheric humidity is so high it will produce regular condensation inside the equipment 1 1 3 Ventilation fire and flammable vapors The equipment should never be placed near or over a heat source The use of electrical or electronic equipment close to fire or flammable vapors is a risk that has to be avoided All ventilation grids must be uncovered to allow hot air out and make sure a proper ventilation of the equipment 1 1 4 Maintenance Any maintenance of this equipment should be carried out by qualified technical service personnel AEQ will not be responsible for any damage caused by unauthorized maintenance operations nor for any damage caused to other equipment or persons due to such unauthorized maintenance Always bear in mind that inside the equipment there is high voltage and there exists the risk of an electrical shock The installation of this unit must be carried out by qualified technical personnel AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender amp AEQ 1 1 5 Warranty AEQ guarantees that this product has been designed and manufactured under a certified
15. its and dedicated telephone lines even to cellular phones Operation in two or four wires modes is user selectable with the switches 2W AW 3 and 8 4 1 1 Connection to two wire lines a Line RJ 11 telephone connectors 17 and 23 center contacts b Equipment RJ 11 telephone connectors 16 and 22 center contacts 4 1 2 Connection to four wire lines Four wire inputs and outputs Hartmann pin headers for each line 18 and 24 From left to right pin 1 Output V pin 2 Output V pin 3 Input V4 pin 4 Output V 4 1 3 Connection to two wire microphone lines Sometimes microphone lines operate in two wire mode In these cases the connector is the same one used for the normal line this means connectors 17 and 22 AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender AEQ 5 REMOTE CONTROL 5 1 Remote control connections 15 pin Sub D type connectors 15 5 2 Automatic recording option The AEQ TH 02 EX Mk III digital hybrid featuring the automatic recording option is manufactured under client s demand The lettering AUTOMATIC RECORDING OPTION is printed on the rear panel of the equipment Line 1 should be used in remote mode with the MPLX back switch deactivated Pin Nr SIGNAL Pin Nr SIGNAL 1 CALL IN LINE 1 10 NOT CONNECTED 2 WAITING LINE 2 11 NOT CONNECTED 3 ON AIR LINE 2 12 NOT CONNECTED 4 WAITING LINE 1 13 NOT CONNECTED 5 ON AIR LINE 1 14 NOT CONNECTED
16. ix Minus bus and the user of the AEQ TH 02EX Mk Ill can also maintain communication with them The equipment cancels the acoustic echo generated in each terminal connected to the equipment 7 2 3 Dual mode In this operation mode a line operates as a digital hybrid and the other as a full duplex intercom In this way the user of the AEQ TH 02 EX Mk Ill is connected with an intercom on one line and a caller on the other connecting both of them with each other ENT ADQGHAM ROGRAMA gt gt V SALIDA 4 HILOS L NEA 1 Sa gt N 4 WIRE OUTPUT LINE 1 ECO AC STICO ACOUSTIC ECHO lt ENTRADA 4 HILOS L NEA 1 4 WIRE INPUT LINE 1 NP L NEA TELEF NICA 2 N JA TELEPHONE LINE 2 SALIDA DEL PROGRAMA q CF 4 PROGRAM OUTPUT MY 4 AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender 14 amp AEQ 8 DESCRIPTION OF FRONT AND REAR PANELS 8 1 Front panel O i 8 O E 1 Line 1 frequency extensor function key 2 Line 1 local remote mode selector key 3 Line 1 2W 4W mode selector key 4 Line 1 hook on hook off key 5 Line 1 key for connection of audio signal to program output 6 Line 2 frequency extensor function key 7 Line 2 local remote mode selector key 8 Line 2 2W 4W mode selector key 9 Line 2 hook on hook off key 10 Line 2 key for connection of audio signal to program output 11 Power On LED indicator 12 On Off switch 8 2 Rear panel mom 5
17. lOris edere e ed xree eo nigen i rud trat n oka n 3 1 1 2 Water and humidity ete io ro o ice P eR tU 3 1 1 3 Ventilation fire and flammable vapors seseeeeeeeese 3 T amp A MAINTENANCE iiie tte erret Eo ete rea Ede PE ER Fe pra PP haan 3 1 1 5 Warranty eini 4 1 1 6 How to proceed in case of feedback sseseesseess 5 General description ssi e oorr eic este e de te m teu aa fedem Ee DIEA 5 POWER SUPPLY tereti e er erret tereti nudus 5 ACIS Al yaa Radar t rou tope P A tote eS 5 AUDIO CONNECTIONS visi eos siento iat ee een eee as 6 GAG OMA m THEM 6 3 1 1 Connection of audio inputs and outputs sseeeeese 6 LINE CONNEGTION 5 inicie acta et ree eee 7 gg ses re P M e 7 4 1 1 Connection to two wire lines eeeesseeeeeeeenneennnnmr 7 4 1 2 Connection to four wire lines 7 4 1 3 Connection to two wire microphone lines seessesseeseees 7 REMOTE CONTROL etu edet hei e cse oi afit doses ie etd tees 8 Remote control connections steer o peine Re Ett qudd deta 8 Automatic recording OpIOF horde etta Eae eti epe dac a eumd m emo ntes 8 CONTROL FUNCTIONS 3 12 55 ioo ocn Uster etti etek 9 Grenelle sete lect tert x Mae dead tenet cao cae tee lean erated E 9 REMOLEMOdE c e a E AE AE A EE A e EAE E Aaa OE ATE 10 SYSTEM S CONFIGURATIONS cseecessseeeeeesseeeeeeeesseneeeeenseeeeeeeseseeeeensseeneees
18. level 10 dBm Nominal output level 6 5 dBm In multiconference mode the output level of the telephone line provinient from the other line nominal input level is 7 5 dBm TWO WIRE MODE Bandwidth extender not active Bandwidth extender active Line 300 4 000 Hz 1 dB Line 50 3 750 Hz 1 dB Program output 300 4 000 Hz 1 dB Program output 50 3 750 Hz 1 dB Distortion THDN 1 KHz with nominal input and output levels Line lt 0 20 Program output lt 0 15 96 Absolute noise TX 2 66 dBm RX lt 68 dBm Frequency extensor TX 250 Hz Rx 250 Hz Cross talk in any case Lower than absolute noise SUPPRESSION OF ELECTRICAL ECHO One line connected Line impedance 600 Ohm Signal source 1 KHz Nominal input and output levels Program output level 64 dBm typical Two lines connected Line impedance 600 Ohm Signal source 1 KHz Nominal input and output levels Program output level 58 dBm typical AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender FOUR WIRE MODE amp AEQ Bandwidth extender not active Bandwidth active extender Line 300 4 000 Hz 1 dB Line 50 3 750 Hz 1 dB Program output 300 4 000 Hz 1 dB Program output 50 3 750 Hz 1 dB Distortion THDN Four wire output Program output Absolute noise Frequency extender Cross talk in any case AC POWER SUPPLY DIMENSIONS 1
19. n 90 to 250V AC without any previous operation The unit s mains connector socket has a fuse box with a 500mA fuse and a spare fuse Note The TH 02 EX Mk Ill is delivered from factory with a euro plug mains connector In some countries this connector must be replaced following the local requirements If your area does not comply with euro plug requirements please replace the mains connector before continuing AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender amp AEQ 3 AUDIO CONNECTIONS 3 1 General Note It is recommended to extend the graphical description of audio connections Section 8 in order to visualize and improve comprehension of the following instructions Bear in mind that if the equipment is supplied with a single line connectors for line 2 will not be available The connectors of the TH 02 EX Mk Ill have been made in accordance to the recommendations of AES 14 1 992 ANSIS 4 48 1 992 This recommendation is based upon the IEC 268 12 of 1 987 Audio Systems Equipment Part 12 Connector application for Radio Broadcasting and similar use Make sure that the audio cables that you are connecting to the equipment follow this standard Otherwise they have to be replaced or modified since they can cause problems in the phase of the audio signal Js Pin connector Output 5 1 8 male N bs Socket connector Input cl female PIN ASSIGNMENT Appliance 1 2 3 Note 1 Balanced
20. nfigurations of the equipment when it operates in this mode are the following 7 2 4 Multiconference mode When both lines operate in two wire mode the AEQ TH 02 EX operates in multiconference mode In this case the user of the AEQ TH 02 EX and two more participants at the ends of both lines can maintain a conversation in full duplex mode it means everybody talks with each other and listens to each other simultaneously in every moment The diagram for this mode is the following ENTRADA AL PROGRAMA _ gt gt PROGRAM INPUT gt LINEA TELEF NICA 1 TELEPHONE LINE 1 NC o L NEA TELEF NICA 2 TELEPHONE LINE 2 XN o SALIDA DEL PROGRAMA q NN 4 PROGRAM OUTPUT VV 4 AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender 7 2 2 Multiplex intercom mode If both lines operate in four wire mode it is possible to establish a full duplex communication between two intercoms and the AEQ TH 02EX Mk Ill in the same way a multiconference is set up when both lines are operating in two wire mode ENTRADA AL PROGRAMA C f PROGRAM INPUT V wv SALIDA 4 HILOS L NEA 1 i 4 WIRE OUTPUT LINE 1 ECO ACUSTICO 1 ACOUSTIC ECHO 1 lt ENTRADA 4 HILOS LINEA 1 4 WIRE INPUT LINE 1 SALIDA 4 HILOS L NEA 2 1 4 WIRE OUTPUT LINE 2 ECO ACUSTICO 2 ACOUSTIC ECHO 2 SALIDA DEL PROGRAMA 4 4 PROGRAM OUTPUT ENTRADA 4 HILOS LINEA 2 4 WIRE INPUT LINE 2 AA Both intercoms are interconnected through the M
21. sult the gain in the system is almost O dB This of course generates oscillation if the acoustic echo is significant Depending on the features of the acoustic medium the acoustic echo and its effects will be different and the cancellation degree must be introduced in the path of the echo Ideally the cancellation of the acoustic echo requires a delay of the same duration than the response time of the echo The AEQ TH 02 EX Mk Ill operating in four wire mode cancels the near acoustic echo The 256 steps adaptative filter cancels the echo with a delay equal or lower than this response It means that there are operative limits when the AEQ TH 02 EX Mk III operates in four wire mode Controlling the speakers gain properly and using directional microphones it is possible to operate with a speaker without problem AEQ TH 02 EX Mk III Digital Hybrid with Frequency Extender amp AEQ The diagram of the AEQ TH 02 EX Mk III operating in four wire mode is the following SALIDA 4 HILOS 4 WIRE OUTPUT ENTRADA AL PROGRAMA ara NC we PROGRAM INPUT WU d gt A D P s DA T wv AFIR ECO ACUSTICO 24 Bits ACOUSTIC ECHO v lt SALIDA DEL PROGRAMA q app ee d eg COR n SET m PROGRAM OUTPUT OS J WAIT Ed E SN ENTRADA 4 HILOS l 4 WIRE INPUT 7 2 Two communication lines When the AEQ TH 02 EX Mk Ill features two communication lines and the switcher MPLX at the back panel is activated the user can benefit from the built in Mix Minus bus The possible co
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