TELOS ProSTREAM - Media
Contents
1. This symbol wherever it appears alerts you to important operating and maintenance instructions Read the manual Read All Instructions All safety and instructions must be read before operating the product Retain All Instructions All safety and operating instructions must be maintained for future refer ence Heed All Warnings All warnings on the product and those listed in the operating instructions must be adhered to Follow All Instructions All operating and product usage instructions must be followed Heat This product must be situated away from any heat sources such as radiators heat registers stoves or other products including power amplifiers that produce heat Water and Moisture Do not use this product near water Attachments Do not use any attachments not recommended by the product manufacturer as they may cause hazards Power Sources This product must be operated from the type of power source indicated on the marking label and the installation instructions If you are not sure of the type of power supplied to your facility consult your local power company Grounding and Polarization This product is equipped with a polarized AC plug with integral safety ground pin Do not defeat the safety ground in any manner Power Cord Protection Power supply cords must be routed so that they are not likely to be walked on or pinched by items placed upon or against them Pay particular attention to the cords at AC wall2. 0 dB Decrease in mix level can be done to a greater amount if needed or desired Preset Editor Main Save Output AGC Final Limit WB L MH LR 0 A 0 12 12 5 5 5 r Final M E j Limit 10 10 24 24 45 15 45 Output 3 3 2 20 3 36 E ele E E SL PROSTREAM CONTROLS 17 Thunder Bass If your source material has it ProSTREAM will put it in the mix and with muscle Making changes to this characteristic is done using the following parameters and for maximum effectiveness in the order listed 1 Inthe enhance menu increase the amount of deep bass boost 2 Inthe enhance menu increase the amount of phat bass boost 3 Increase the drive to the LF AFC with the appropriate control in the LO AGC screen gt Speed up the release times of the LF LO AGC section 5 Slightly increase the low control in the mixer section When processing moderation is the key If all of the above steps are utilized in the pursuit of more bass then severe low frequency over enhancement can occur Excessive bass boost can produce the illusion that the presence and high frequencies have been lost They are still there but are being acoustically masked by the lower frequencies Generally an increase in the enhance menu s bass boost functions alone will provide more than sufficient enhancement to the low end Reducing Codec Artifacts Dynamics processing is an extremely useful tool for reducing audible artifacts from lossy
3. compression codecs High frequencies tend to be the first perceptible annoyances followed by that swishy swirly water like sound common at lower bitrates These artifacts can be reduced and in some cases eliminated when audio processing is applied as a tool Generally as codec bitrates are reduced so is the audio bandwidth ProSTREAM contains selectable low pass filters in the output section Reducing the audio bandwidth through filtering will help Additionally the upper band of processing can be reduced in the MIX section which will allow that band to act as a dynamic governor Operating the HF Band in the slow release time will reduce HF density which improves intelligibility as the encoder masking algorithm is not loaded as heavily with HF content Codec r e ProT REAN Select the codec parameters below then click Save when done AAC LC x Stereo e 192 24 to 320 kbps if not sure select ADTS ProStream v1 0 14b Build 2011 07 14 Copyright 2011 TLS Corporation 18 Section 3 The codec represents the manner in which the 1 4Mbps stream of un compressed audio data will be converted into a smaller data stream by means of digital compression ProSTREAM applies lossy compression algorithms to the processed audio in order to create a live data stream for end users via the Internet A lossy compression technique produces a data stream small enough to be delivered to the client via DSL EDGE wireless or an
4. ete ae as eae ee ee ee ee 10 IN OUT status bar graphs 2 ee ee ee 10 Automatic Gain Control AGC 2 ee ee 11 HME Snes oo rosados POS ee ee Pee a 12 Omnia Processing o ee 12 Getting the Sound You Want 13 Adding More Detail When Loudness Isn t the LastWord 15 Equalization Changes 2 16 Thunder Bass sas oe eee a NA a a GPA 17 Reducing Codec Artifacts 17 A1 A2 A3 Compression Codec Channels Bitrate Transport mr Metadata Streaming Servers Streaming Servers Stream Server Service Providers Warranty and Application Cautions ProSTREAM Audio Specifications Safety Notification 23 23 24 25 27 29 A Letter from our CEO What if A singularly great question because it opens the door to so many other questions and ideas Those who ask it are sometimes called dreamers as if that were somehow bad but history has often proven dreamers to be the avatars of new and exciting things What if was the query asked by Steve Church that led to the start of Telos Systems In 1984 Steve then a young broadcast engineer and part time talk show host won dered whether emerging Digital Signal Processing DSP technology might be useful to clean up the terrible caller audio then the norm at radio stations The result of asking it was the Telos 10
5. for Internet clients FYI MPEG License amp Music Copyright Musical compositions and sound recordings are creative works that are protected by the copyright laws of the United States title 17 U S Code and other countries Under U S law the owner of a copyright has the exclusive right and may authorize others to reproduce the work use parts of the work in a new creation distribute the work in whole or in part and to publicly display or perform the work including on web pages and through webcasting With few exceptions it is illegal to reproduce distribute or broadcast a sound recording without the permission of the copyright owner It is your responsibility to comply with the copyright laws of the United States and other countries in which you broadcast and to pay all applicable royalties to the copyright owners when you become a webcaster There have been recent amendments to the copyright law regarding webcasting of sound recordings These new provisions allow webcasting under the terms of a statutory license as a way to help webcasters get permission without having to go to each sound recording s owner The statutory license however has strict requirements that you must follow Some of these requirements include the payment of license fees limitations on the number of songs from the same album or artist that may be played in a three hour period called the sound recording performance complement a prohibition on publishing a
6. long term RMS levels which translates into increases in perceived loudness If a loud and proud signature is desired then use more from the limiters Loudness at all costs is usually the reason for utilizing more aggressive limiting Using larger amounts of drive to the multiband limiters along with faster release times will generate a signal of high short term density The effect of this type of process ing is that the audio is consistently loud at all times or a wall of sound The drawback however is the PROSTREAM CONTROLS 15 density can cause greater listener fatigue While ProSTREAM s Omnia processing is designed to minimize fatigue it is capable of generating large amounts of density that could eventually lead to fatigue Adding More Detail When Loudness Isn t the Last Word The previous examples demonstrate how to heavily process the incoming audio If more detail and resolu tion are desired reversing the procedures listed above will do the trick 1 Reduce the drive to the Final Limiter 2 Back off on the influence of the multiband stages Reduce the amount of Drive to each band in the multiband Increase the Release times to slow down recovery 3 Ease up onthe Wideband AGC sections Reduce the Drive to the WB AGC Increase the Release time to operate slower Backing off the limiting sections first will allow the processing to retain a level of competitive loudness while enhancing quality and th
7. plugs and convenience receptacles and at the point where the cord plugs into the product Lightning For added protection during a lightning storm or when the unit is left unattended or unused for long periods of time unplug the unit from the AC wall outlet This will prevent damage to the product due to lightning and power surges Overloading Do not overload AC wall outlets extension cords or integral convenience outlets as this can result in a fire or electric shock hazard Object and Liquid Entry Never push objects of any kind into this product through openings as they may touch dangerous voltage points or short out parts that could result in a fire or electric shock Never spill liquid of any kind on the product 30 A3 14 15 16 17 18 19 Accessories Do not place this product on an unstable cart stand tripod bracket or table Any mounting of the product needs to follow the manufacturer s instructions Servicing Refer all servicing to qualified service personnel Damage Requiring Service Unplug this product from the wall AC outlet and refer servicing to quali fied service personnel under the following conditions 4 When the AC cord or plug is damaged If liquid has been spilled or objects have fallen into the product Ifthe product does not operate normally following operating instructions If the product has been exposed to rain or water Ifthe product has been dropped or damaged in a
8. s IP address and run SHOUT cast DNAS with the following minimal sc_serv conf file SHOUTcast 1 9 8 configuration file not production ready MaxUser 32 Password Telos PortBase 8800 SrcIP ANY Dest IP ANY Streaming server operation can be verified by opening a web browser and navigating to the SHOUT cast server root URL This URL is the IP of the computer running SHOUTcast DNAS followed by a colon and the port number configured in the sc_serv conf file I E http 192 168 0 9 8800 When functioning the SHOUTcast DNAS Status webpage will appear displaying Server Status Server is currently down Status Song Hist Listen Stream URL Admin Login Current Stream Information Server is currently down Written by Stephen Tag Loomis Tom Pepper and Justin Frankel 1998 2004 TELOS SYSTEMS PROSTREAM 3 ProSTREAM Settings Erom the front panel of the ProSTREAM set the following menu options 1 4 4 4 4 Audio Connect an audio source to the XLR inputs and select Audio Input XLR Verify input audio with headphones by pressing the headphone knob to select Listening to input audio Network Choose LAN Mode Auto DHCP to select Configure the LAN port of the ProSTREAM to feed your SHOUT cast server The stream can be delivered via the LAN port in a single network configuration Omnia Processing Select a preset best suited to the audio source material If unsure use Normalize Processor enhance me
9. the ProSTREAM s options and settings When in operation the display screen displays audio and process meters 3 Control Knob The main control knob next to the display also acts as a selector by pressing the knob Once a desired option is displayed pressing the control knob will select the option The control knob is also be used for character selection in text entry fields 6 Section 2 Return Button The return button is adjacent to the control knob and will step back from a selected option Repeated presses of the return button will switch the display between the menu and metering display Headphone Jack 1 4 Stereo TRS Jack switching between input and post process output audio monitoring Headphone Volume Knob The headphone volume knob controls the output level of the audio being sent to the headphone jack Pressing the headphone volume knob will toggle the headphone output between the input audio and the post process output audio Connections Eol cH 1 QUT AC Mains connection CH 2 OUT 2 TELOS SYSTEMS CLEVELAND OHIO telos systems com 2001 0028800 A sore CE Sonia A a Retails oe joe PARALLEL CONTROL i j MAC j amp ona aa i Tae gt 0286K0010 LAN 110 220v auto switching power connection Use supplied power cord appropriate for your area LAN Network The LAN network jack is a 10 100 RJ45 jack and can be used on a Livewire network for source audio and post process au
10. the world s first digital telephone hybrid a product that changed the face of radio forever Looking back at Telos history What if is found at the root of many more technologies broadcasters have since made ubiquitous MP3 bit rates are perfectly matched to the bandwidth of ISDN what if we combined them What if we built a box that let radio stations stream audio on the Internet What if we could use Ethernet to treat audio as data and move it around the radio station in real time By the way if you recognized the answers to those questions as the Zephyr ISDN codec AudioActive MPEG encoder and Livewire IP Audio standard give yourself a cookie Today as technology roars ahead we re constantly seeking new ways to apply it to the problems of everyday broadcast ing Voice over IP VoIP is particularly compelling for its ability to packetize high quality phone calls and direct them anywhere in the broadcast plant using ubiquitous standard Ethernet as a backbone A new digital tech called AEC Advanced Echo Cancellation is helping to literally ALETTERFROMOURCEO VII eliminate the age old problem of feedback in open speaker environments And the prize of using the public Internet for remote connections as reliable as those of switched circuits is within broadcasters grasp thanks to ever more sophisti cated coding algorithms Pioneering ideas aren t limited just to technology though We believe t
11. 0247 24 7 Technical Support Support Telos Systems com Inquiry Telos Systems com Notices and Cautions This symbol wherever it appears alerts you to the presence of uninsulated dangerous voltage inside the enclosure voltage which may be sufficient to constitute a risk of shock This symbol wherever it appears alerts you to important operating and maintenance instructions Read the manual CAUTION THE INSTALLATION AND SERVICE INSTRUCTIONS IN THIS MANUAL ARE FOR USE BY QUALIFIED PERSONNEL ONLY TO AVOID ELECTRIC SHOCK DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO REFER ALL SERVICING TO QUALIFIED PERSONNEL WARNING TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOIS TURE USA CLASS A COMPUTING DEVICE INFORMATION TO USER WARNING This equipment generates uses and can radiate radio frequency energy If it is not installed and used as directed by this manual it may cause interference to radio communication This equipment complies with the limits for a Class A computing device as specified by FCC Rules Part 15 Subpart J which are designed to provide reasonable protec tion against such interference when this type of equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference If it does the user will be required to eliminate the interferen
12. TELOS ProSTREAM Network Audio Processor and Stream Encoder I gt USER S MANUAL Version 1 0 September 2011 Telos ProSTREAM Manual 2011 TLS Corporation Published by Telos Systems TLS Corporation All rights reserved Trademarks Telos Systems the Telos logo and ProSTREAM are trademarks of TLS Corporation All other trademarks are the property of their respective holders Notice All versions claims of compatibility trademarks etc of hardware and software products not made by Telos mentioned in this manual or accompanying material are informational only Telos Systems makes no endorsement of any particular product for any purpose nor claims any responsibility for operation or accuracy We reserve the right to make improvements or changes in the products described in this manual which may affect the product specifications or to revise the manual without notice Warranty This product is covered by a two year limited warranty the full text of which is included in this manual Updates The operation of the ProSTREAM is determined largely by software We routinely release new versions to add features and fix bugs Check the Telos web site for the latest We encourage you to sign up for the email notification service offered on the site Feedback We welcome feedback on any aspect of the Telos ProSTREAM or this manual In the past many good ideas from users have made their way into software revisions or new products Pl
13. Those will add loud ness but usually at the cost of quality Many times building a little more RMS level in the AGC sections will do the trick instead and with no obvious sonic penalties Here in order are the best places to start 1 Alter the following parameters in the AGC sections Increase the AGC Drive to the WB wideband AGC section Increase the Drive to each band of the multiband AGC screen Decrease the Release time settings in each band to make it operate faster 2 Drive the final limiter section harder 3 Use combinations of the above steps but in small increments When multiple changes occur it becomes difficult to determine why the result of an adjustment did or did not make sense Focus on one specific area the processed sound at a time Once that area is satisfactory then move the focus to the next area as needed It may be desirable to have the processing be perceptibly loud but dynamic This may give the illusion of loudness retaining detail and clarity but reduce listener fatigue This can be achieved by centering efforts in the multiband section and avoiding heavy use of the final limiter One trick is to use fast release times in the multiband limiters but do not let them produce more than 5 dB 7 dB of gain reduction This keeps the IM distortion of the limiters to a minimum and doesn t over squash the audio When adjusted in this manner the limiter sections are relied upon to generate higher
14. Wide dynamic range audio audio with low RMS and high peak levels causes the opposite to occur The multiband bar graphs become active while the WB AGC section appears to not respond as much The mul tiband AGC s can work aggressively with wide dynamic range audio while the WB AGC section indicates little activity The WB AGC section is designed to operate much slower than the multiband gain controls primarily because of the nature of each function The WB AGC operates on the audio s RMS energy During gain calculations the incoming audio s average level is established and gain adjustments if needed are made based on those calculations The WB AGC bar graph will appear to move slower as it makes changes over relatively long time periods The intent of the multiband gain control is to normalize the spectral balance and provide control of the peak levels Peak energy must be detected and adjusted in a quick and accurate manner but not interfere with the sonic integrity of the audio signal For this reason the multiband gain controls operate faster with special background instructions to govern their behavior and strictly on an as needed basis 12 Section 3 Limit The limit bar graphs monitor the level to which the processor is engaging gain reduction in the post process audio for each the left and right channels The meters only analyze the signals and aid in adjusting the specific parameters needed to achieve desired
15. al web interface accessible via both the LAN and WAN net works as well as via the front panel controls The web interface can be reached by pointing a web browser to the IP address of either LAN or WAN network The default credentials to access the web interface are username admin password Telos All configurations and settings available for ProSTREAM are available via the front panel and the web interface unless specifically called out in this document Some setting values may or may not be locked or unavailable if they are dependant upon other configured options We ll show Web interface screenshots as well as front panel displays where appropriate Audio Menu Audio I O interface You may choose XLR or Livewire network inputs from this drop down box Audio Input Level 0 0 dB 22 5 dB The Audio Input Level is adjustable from a OdB level of gain to 22 5 dB level of gain 10 0dB is a good starting point for analog audio input _AH ProS rien Select the audio D O parameters below Click the save button when done Audio T O interface xR ll nan db 0to225dB gt nan dB 95 2to0dB source audio or the processed audio push the volume knob to toggle ProStream v1 0 14b Build 2011 07 14 Copyright E 2011 TLS Corporation 8 Section 3 Audio Output Level 95 2 dB 0 0 dB The Audio Output Level affects the signal level for the ProSTREAM s rear outputs and Livewire returns The internal au
16. aph This action is more apparent on dynamically textured audio Another feature unique to Omnia processing is processor hold During brief pauses in audio the bar graphs will freeze indicating the processor in the hold mode of the algorithm This can occur when there is dry vocal audio in the signal ProSTREAM s processor is capable of performing many different processing functions at different times The processing display bar graphs indicate different kinds of operation with different audio sources This is primarily based on dynamic range differences in source audio Bar graphs will indicate differently for pre processed audio or audio lacking dynamic range the than with audio possessing a high degree of dynamic range Audio signals which lack dynamic range whether natu rally or by prior processing will possess a lower peak to average ratio Conversely audio with wide dynamic range possesses a higher peak to average ratio ProSTREAM adapts to each case Low dynamic range audio audio with high RMS and low peak levels will show more activity in the WB AGC bar graph and less activity in the multiband bar graphs The WB AGC responds to high RMS energy while the multiband section reacts to lower peak energy Multiband bar graphs may not indicate any action at all with some low dynamic range audio which is normal for Omnia processing This may occur with heavily processed commercials or music or with music passages of sustained level
17. aural results The processing displays are capable of providing a wide range of information but is not recommended to set up processing based on using ears to judge the sound not specified meter indications O Omnia Processing Omnia Processing The dynamics processing algorithms in use in the ProSTREAM are based upon Omnia Audio s highly successful Omnia 3net which is a hardware based DSP audio processor ProSTREAM performs internal calculations on the source audio with precision sufficient to guarantee 24 bit dynamic range ProSTREAM s processor effects can be monitored via the front panel when set to Status ProSTREAM employs the following Omnia processing architecture Wideband AGC 3 Band Combined Compressor Limiter HFEQ Adjustable Bandwidth Lowpass Filter Final Look Ahead Limiter 4 Processing Preset Editor Editing preset Smooth used by ProStream Input Output 0 i 4 6 6 1 12 Ic Final 8 Limit i pi 30 30 36 Output 36 dBFS Gain Right I i 0 5 10 15 20 25 WB AGC 0 5 10 15 20 Preset Editor L MH Main Save Final Limit L R 0 5 10 15 PROSTREAM CONTROLS 13 All audio processing adjustments are performed in the Preset Editor which is only available via the web interface A preset represents all of the control values for every control in the Omnia processor When a preset is chosen for the processor control values for the processo
18. ce at the user s expense NOTE Objectionable interference to TV or radio reception can occur if other devices are connected to this device without the use of shielded interconnect cables FCC rules require the use of shielded cables CANADA WARNING This digital apparatus does not exceed the Class A limits for radio noise emissions set out in the Radio Interference Regulations of the Canadian Department of Communications Le present appareil numerique n emet pas de bruits radioelectriques depassant les limites applicables aux appareils numeriques de Class A prescrites dans le reglement sur le brouillage radioelectrique edicte par le ministere des Communications du Canada TELOS PROSTREAM MANUAL V Table of Contents WE SUDDOM VO s cana ra E A OS SE Oe A letter from our CEO lt Vil 1 Introducing ProSTREAM 1 FYI MPEG License Music Copyright 1 UKS se wee eee OS ee oe ae oo oe eee 2 Streaming Server software 2 o o 2 ProSTREAM Settings 3 2er HS 6 ER OS OS ewe oe 3 Listening to the encoded ProSTREAM web stream 3 2 Controls and Connections 5 UNEN cB RE Oe aoe ee era aras Be 5 User Interface 24 2068 20k aoe o 8 6 aS God Mike hae Oe Boe Grd 5 CONMCCUONS reso sarao dae 6 CAMI aseo ar e A E 6 3 ProSTREAM Controls 7 Audio Men 4 a sea ah eae ee ok a oS eGo Rh eee ea 7 Network Menu 24 24 6 Goose 4 Geb So rs de YS 9 IOUS sue ica
19. dio bridge from the processor to the encoder is unaffected by the Audio Output Level setting The default setting of 0 0 dB will direct the full level of the processed audio to the ProSTREAM outputs Livewire Input Channel If you ve chosen the Livewire interface you 1l be given fields to assign input and output channels Livewire IP audio is assigned via channel numbers This must be set to the channel of an active Livewire IP audio source channel generated by another device connected to the ProSsTREAM s LAN network port Livewire Output Channel A channel number should be assigned to the ProSTREAM s Livewire source This audio is the same post process audio as the rear XLR outputs The Livewire channel should be unique to the available channels on the Livewire audio network connected to the ProSTREAM LAN network jack Prod REAM Audio V O interface Livewire Warning Uncompressed audio generates a lot of network traffic Do not use Livewire unless you have a properly configured network switch destination Output Livewire channel source NOTE The rear panel audio output plays the Ommia processed audio The headphone output plays either the source audio or the processed audio push the volume knob to toggle ProStream v1 0 22b Build 2011 07 30 Copyright amp 2011 TLS Corporation PROSTREAM CONTROLS 9 Network Menu teto Prod REAM Configure the network interfaces below then click the Save button when
20. dio monitoring The LAN network can also be used to access ProSTREAM s internal web configuration pages The LAN network may also be used for connection to the stream ing server instance WAN Network The WAN network jack is a 10 100 RJ45 jack which can be used to access the streaming server instance if the streaming server is running on a network other than a local or Livewire network Typically this would be an Internet accessible network connection if connecting to a streaming relay service Analog Audio Inputs female 3 pin XLR left amp right Analog Audio Outputs male 3 pin XLR left amp right USB Future use Parallel Interface Future use Editing Text When a text field is displayed press the main knob to enter edit mode If the field was previously blank you will now be in text entry mode a solid cursor is displayed otherwise you will be in erase mode a rectangle cursor In text entry mode mode turning the knob cycles though all available characters while pressing the knob selects the current character and moves the cursor to the next character position While in text entry mode pressing the Return button once switches the cursor to erase mode In erase mode turning the knob erases or restores characters While in erase mode pressing the main knob switches back to text entry mode while pressing the return button exits the field editing altogether ProSTREAM Controls ProSTREAM can be configured via its intern
21. done The ProSTREAM is equipped with two RJ45 gigabit network ports marked LAN Local Area Network and WAN Wide Area Network The networking settings of the ProSTREAM are of IPv4 conventions and must be assigned an IP address before the ProSTREAM will communicate with any other devices If Livewire IP audio is to be used as a source instead of the rear mounted XLR inputs the LAN port must be connected and assigned an IP address on the Livewire audio network Encoded audio can be delivered via either the LAN or WAN port The settings available in the ProSTREAM configuration options contain independent settings for the separate WAN and LAN networks Each port can be configured with the following settings Mode The Mode of the network port can be set either to Auto DHCP Manual or Disabled In Auto mode the network port must receive it s IP address via broadcast from a DHCP server elsewhere on the network When in Auto mode assigned settings from the DHCP server will be visible in the following settings but will be unable to be changed The assigned IP address will be needed in order to connect to the internal web configuration interface In Manual mode all configurations must be entered manually If a network port is unused the port should be set to Disabled 10 Section 3 IP Address The IP Address is made up of four octets assigned to either the LAN or WAN network ports on the ProSTREAM When the port s mode is set to manua
22. dvance playlists and a requirement to identify the song artist and album on the website There are other requirements as well The Recording Industry Association of America provides quite a bit of information on copyright law as it applies to webcasting and both ASCAP and BMI have created license agreements that they are willing to grant to webcasters that they believe conform to the provisions of the new copyright rules for webcasting For additional information on the statutory license and other aspects of webcasting please visit the following sites The U S Copyright Office http www copyright gov The Recording Industry Association of America http www riaa com issues music webcasting Y ASCAP http www ascap com weblicense webintro html BMI http www bmi com iama webcaster index asp Streaming Server software 2 Section 1 Quick Start Telos ProSTREAM Omnia i MPEG Stream Processor l encoder In order to quick start a ProSTREAM web stream a streaming relay server instance can be used to test ProSTREAM functionality This example uses SHOUTcast DNAS 1 9 8 Current Stable Version freely available for major computational platforms from http www SHOUTcast com broadcast tools Audio Source Analog XLR or LiveWire AES optional Streaming server ShoutCAST server Internet listeners Streaming Server software Once SHOUTcast DNAS is installed make note of the server machine
23. e ProSTREAM s stream compressor Both input and output audio can be monitored via the front panel headphone jack and selector but encoded audio still requires an external decoder in order to be monitored A streaming server instance will accept the continuous stream of packed data from the ProSTREAM and replicates the packet streams to each client program device or mobile phone via the Internet As the stream s content increases in popularity the task of delivering the stream can require significant Internet bandwidth may even need to be shared amongst multiple server instances and or services A streaming server instance can be used in this situation to supply multiple streaming server instances or services Just like a terrestrial broadcast this distribution must all start with the single server instance to which the ProSTREAM is delivering the compressed packet stream Streaming Server Software Icecast2 http www icecast org Wowza http www wowzamedia com Streamcast http www radiotoolbox com Windows Media HTTP Streaming ProSTREAM has a built in mini server on TCP port 8000 This server can accept only a few connections and should not be used as the main streaming server It is intended to be used for stream monitoring with a player or to have another media server pull the stream from ProSTREAM allowing monitoring of the encoded stream This is helpful in troubleshooting server connections or just as a quic
24. e bar section represents the RMS average of the signal Wide dynamic range will display a separation between the pills and the bar whereas signal with little peak information will cause the pills to ride on the crest of the bar graph The bar graphs can indicate up to 25 dB of gain reduction PROSTREAM CONTROLS 11 Note The input and output levels are displayed relative to OdB full scale OdBfs The 0 indicator on the input output bar graphs means that every available bit of signal level is being used at that time There is nothing more in the level department except to create distortion nasty sounding distortion Automatic Gain Control AGC There are two sections to the Automatic Gain Control AGC bar graphs display wide band automatic gain control WB AGC and multiband automatic gain controls The multiband AGC bands are low frequency mid frequency and high frequency The bar shows the average value of the gain reduction while the floating pill indicates the peak value of gain reduction The Omnia processor algorithms automatically adapt the style of compression limiting control being employed on a moment by moment basis This can be deduced if the metering is studied over time During normal operation the bar graphs will have a dynamic bounce Every now and then the processor will react quickly and show a larger amount of gain reduction This action will recover very slowly and return to rest with the main bar gr
25. e display interface and provides a visual representa tion of the aural states of the ProSTREAM The status display as shown in the display photo above shows real time bar graphs representing the metered audio level for each the left and right inputs and post process outputs Clicking on any block in the signal flow diagram lets you adjust the options for that particular block AGC LIMIT 20 202 E E IN OUT status bar graphs The IN bargraphs meter the audio input levels from either the rear panel or Livewire audio sources con nected to the ProSTREAM This audio can be aurally monitored via the front panel headphone jack if the headphone audio is set to Listening to input audio The OUT bargraphs meter the post process audio levels being sent to the internal stream encoder as well as either the ProSTREAM s external outputs or the Livewire output channel on the LAN connector Note that the output level of the ProSTREAM s physical output can be varied with the Audio Output setting The post process audio can be aurally monitored via the front panel headphone jack of the headphone audio is set to Listening to output audio The bar graphs are capable of indicating more than just level information The texture and density of the audio signal can be observed based upon the dynamic action of the bar graphs and peak responding pills Of interest are the pills at the end of the input and output meters which indicate peak level Th
26. e overall dynamic texture will be affected less Start with reducing the limiter amount in 0 5 dB steps Detail can be restored from just a small change of 0 5 dB Generally changes in limiter drives will have the most noticeable effect on quality but it will also affect the relative loudness level as well Preset Editor Main Editing preset Smooth used by ProStream Save pp nn AE Output AGC Final Limit 0 WB L MH LR 1 0 0 05 12 5 5 1 18 10 24 15 3 20 25 16 Section 3 Equalization Changes Use the following steps to tailor the shape of the overall audio spectrum 1 Adjust the relative drive settings in the multiband AGC menu These controls set the drive levels of the multiband AGC sections 2 Adjust the settings of the multiband mixer controls 3 Adjust the mixer The first two options will provide noticeable change in EQ We suggest the first option In this case an EQ change is still followed by a dynamically controlled stage therefore any excessive EQ change can be undone by the subsequent AGC The last option adjusting the mixer is designed to provide a final minor trim to the spectrum The mixer controls are calibrated in 0 10 dB steps for fine trim Since the mixer stage follows the dynamic AGC and limiting a radical change in level in the mixer will result in additional and possibly excessive limiting of audio in that band Changes implemented here are best limited to about 1
27. ease contact us with your comments Service You must contact Telos before returning any equipment for factory service We will need the serial number located on the back of the unit Telos Systems will issue a Return Authorization number which must be written on the exterior of your shipping container Please do not include cables or accessories unless specifically requested by the technical support engineer at Telos Be sure to adequately insure your shipment for its replacement value Packages without proper authorization may be refused US customers please contact Telos technical support at 1 216 622 0247 All other customers should contact your local representative to make arrangements for service We support you By Phone Fax You may reach our 24 7 Support Team anytime around the clock by calling 1 216 622 0247 For billing questions or other non emergency technical questions call 1 216 241 7225 between 9 30 AM to 6 00 PM USA Eastern Time Monday through Friday Our fax is 1 216 241 4103 By E Mail Technical support is available at Support Telos Systems com All other inquiries at Inquiry Telos Systems com Via World Wide Web The Telos Web site has a variety of information which may be useful for product selection and support The URLis www Telos Systems com 10987654321 Telos Systems USA Telos Systems 1241 Superior Avenue E Cleveland OH 44114 USA 1 216 241 7225 phone 1 216 241 4103 fax 1 216 622
28. eiling level in the signal chain and accept the by products of the interactions and conflicts among them ProSTREAM can change that The Omnia processing is designed to look at the incoming audio and make the final mix consistently loud without the artifacts or grunge created by older processors ProSTREAM makes loudness an effortless exercise The trade off between quality and loudness is primarily determined by the limiting and clipping sections While each function alone will generate added loudness each has its strength as well as side effects When excessive limiting is used inter modulation distortion is increased making the audio sound mushy and smeared The added short term density can also cause the audio to be tight squashed or dense The dynamics artifacts caused by excessive limiting might sound like pumping or breathing The suggestion for limiting is a little goes a long way When excessive clipping is used harmonic distortion is increased The audio level is in effect running into the 99 66 99 66 brick wall Too much clipping can cause the audio to sound broken up torn rough or edgy The harder the limiters and clippers are driven the louder the audio perception However increased inter modulation and or harmonic distortion is likely to occur Resist the temptation to crank up the aggressive processing sections like the limiters
29. g changes to processing ears become less sensitive to the adjust ments Spreading the adjustment period over a number of days is recommended Getting the Sound You Want ProSTREAM is designed to minimize the impact of the quality vs loudness trade off If the desire is to process aggressively here are some suggestions that should help achieve that goal It s recommend that be fore tuning the processor for raw loudness decide what sonic characteristics are lacking in the final sound Obtaining the objective sound can be as simple as creating an illusion of added loudness by changing a single time constant parameter There are even instances where stereo enhancement can create the necessary apparent loudness The old adage of less is more really can apply 14 Section 3 There is no precise recipe for setting up audio processing While there are some basic fundamentals which can be used to get started toward the desired sound it may require a concerted effort with extended listen ing and subtle processing changes over time to achieve the ultimate goal It s very helpful to know the goals take time and adjust methodically It s perfectly acceptable for the final mix to be loud In the past loudness was a problem due to the limita tions of the processors of the day In the quest for ultimate loudness older processors were probably either adjusted or modified well outside of their safe range Another method was to push the OdBfs c
30. hat investing in people pays off big so we ve assembled the largest R amp D team in the industry a talented staff of engineers scientists and broadcast professionals We re also the first and only broadcast equipment maker with a 24 7 support team ready to offer assistance any time of the day or night As they say radio never sleeps so neither do we As Telos navigates its third decade in broadcasting s choppy waters the culture of innovation and creativity that propelled Steve in the early days still guides us today We re still in love with radio still turned on by new technology still driven to ask What if If you re reading this you are too for which we thank you from the bottom of our hearts Michael Catfish Dosch CEO Introducing ProSTREAM The Telos Systems ProSTREAM is a hardware based audio processor and web stream encoder device in a compact 1U rack mount chassis The ProSTREAM will process and encode audio sourced from either rear mounted analog audio inputs via Livewire IP audio technology or via optional AES EBU digital inputs ProSTREAM uses Omnia Audio s proven audio processing algorithms to balance the input audio to fit your program s sound ProSTREAM encodes the processed audio and muxes the companion real time program meta data into a compressed web stream ProSTREAM then connects to a streaming relay server instance or streaming service provider to deliver a rock solid packet stream
31. he streaming audio contain displays which can be used to present the text information in real time In the event that no metadata is provided to ProSTREAM the stream s Stream Name configuration will be included as the stream s text content Most automation systems will provide an option for submitting metadata to a streaming server Metadata connections are made to ProSTREAM via TCP or UDP connections to port 9000 If no automated data stream is available a manual entry form is included in ProSTREAM to allow manual entry of playlist information ProSTREAM includes default templates for several common automation data formats Each of the tem plates can be modified to suit any changes needed or new templates can be created Metadata templates can be selected via the front panel or via the web interface however adding or changing templates can only be done via the metadata manager portion of the web interface The templates included with ProSTREAM include the following 4 Character Parser Sample 4 Line Parser Sample Nexgen Audio Sense Simian Template 1 XML Parser Sample XML Jazler Y XML Jazler2 XML MediaTouch XML MediaTouch2 XML Sample2 Y XML Zetta The metadata selection page describes the format accepted by the templates in more detail The ProS TREAM metadata parser utilizes the templates to determine the incoming data contents and will wait for a complete record before it will update the outgoing metadata The tem
32. he various audio equipment parts software and accessories manufactured sold and or distributed by TLS Corp d b a Telos Systems hereinafter Telos Systems With the exception of software only items the Products are warranted to be free from defects in material and workmanship for a period of two years from the date of receipt by the end user Software only items are warranted to be free from defects in material and workmanship for a period of 90 days from the date of receipt by the end user This warranty is void if the Product is subject to Acts of God including without limitation lightning improper installation or misuse including without limitation the failure to use telephone and power line surge protection devices accident neglect or damage EXCEPT FOR THE ABOVE STATED WARRANTY TELOS SYSTEMS MAKES NO WARRANTIES EXPRESS OR IMPLIED INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FIT NESS FOR A PARTICULAR PURPOSE In no event will Telos Systems its employees agents or authorized dealers be liable for incidental or conse quential damages or for loss damage or expense directly or indirectly arising from the use of any Product or the inability to use any Product either separately or in combination with other equipment or materials or from any other cause In order to invoke this Warranty notice of a warranty claim must be received by Telos Systems within the above stated warranty period and warranty coverage mus
33. icrelay 0 in the sc_serv conf file used to run the SHOUTcast server instance Wowza Media server Wowza media server is a popular streaming server which can be used to stream to clients of all kinds via the Internet Wowza also includes a customizable flash streaming client Wowza server does not accept a push stream configuration from ProSTREAM and thus will not require any stream configuration within ProSTREAM but instead will pull the stream from ProSTREAM s internal mini server on port 8000 The Wowza website at http www wowzamedia com contains documentation on configuring SHOUT cast compatible streaming Streaming Services A streaming service can provide all that is needed for distribution of ProSTREAM s stream Typically pricing via a monthly base rate and bandwidth costs The streaming service provider will provide the stream configurations for ProSTREAM and return to the client any number of services including stream link URL s to provide to listeners A streaming service can also provide failover and optional configurations shoulda connection be lost Stream Server Service Providers 4 Stream Guys http www streamguys com 4 PlayStream http www playstream com ViaStreaming com http viastreaming com Additional streaming services can be found at http www radiotoolbox com hosts A 1 Warranty and Application Cautions ProSTREAM LIMITED WARRANTY This Warranty covers the Products which are defined as t
34. k way to test every thing is working as expected The HTTP server is also useful when adjusting audio processing parameters as the audio can be monitored with compression The audio delay should also be shorter than listening to the stream delivered through an external server SHOUTcast DNAS http www SHOUTcast com broadcast tools SHOUT cast com is a streaming community on the Internet operated by Nullsoft and sponsored and supported by AOL SHOUTcast does not relay streams or provide any live bandwidth features for free SHOUT cast com is the home of the following free software and services 24 Section 4 Winamp client media player SHOUT cast DNAS Streaming Server SHOUTcast Transcoder SHOUTcast Radio Directory The SHOUT cast streaming protocols used for the transport of encoded data streams are the protocols used by many other streaming servers and services ProSTREAM currently supports SHOUTcast version 1 not version 2 Note When a SHOUTcast DNAS is used in it s default configuration the SHOUTcast DNAS stream ing server will accept incoming streams and automatically configure them as PUBLIC In it s default configuration SHOUTcast DNAS will post PUBLIC streams to the free SHOUTcast Radio Directory while the stream instance is active This innocuous listing can be desirable in a production setup but is typically unnecessary during development YP listing feature in SHOUT cast can be disabled by setting allowpubl
35. l this setting can be manually assigned When the port s mode is set to auto this setting will show the ProSTREAM s assigned IP address for that port if the port is connected to a network and has successfully negotiated with a DHCP server for an address If the port is set to auto and has not received an IP address from a DHCP server then the IP address will show 0 0 0 0 Netmask The netmaskis a needed component of IPv4 networking The netmask defines the scope of the local network that port can speak to without requiring use of the gateway When the port s mode is set to auto this setting will be locked and displaying the assigned netmask if a DHCP lease has been negoti ated or 0 0 0 0 if not If the port s mode is set to manual the appropriate netmask for the IP address assigned to this port should be entered Gateway The gateway is a needed component of IPv4 networking The gateway defines the address of the router device used to communicate with other subnets if available When the port s mode is set to auto this setting will be locked and displaying the assigned gateway if a DHCP lease has been negoti ated or 0 0 0 0 if not If the port s mode is set to manual the appropriate gateway for the IP address assigned to this port should be entered if available If no network gateway is available this setting can be left unassigned or set to 0 0 0 0 vw Status Status The status display of the ProSTREAM is the default devic
36. lexity Gp AAC LC Also known as aacPlus or AAC Advanced Audio Coding s Low Complexity codec is a high performance codec for excellent audio quality at lower bitrates AAC LC can be found in widespread use most notably in Apple s iTunes When compared side by side with MP3 the superior quality of audio encoded with AAC LC becomes much more apparent at lower bitrates HE AAC Co HE AAC High Efficiency Advanced Audio Coding is a newer AAC codec and incorporates Spectral Band Replication SBR bandwidth expansion to improve audio at very low bitrates HE AAC v2 applies a Parametric Stereo feature to HE AAC codec allowing for even further reduction in bandwidth Channels Choose from mono or stereo encoding Bitrate The full spectrum of ProSTREAM encoding can be anywhere from 14 320 kbps for the output data stream bitrate The output bitrate constraints will differ depending on which codec is selected and whether the encode is set to mono or stereo The range of each codec is shown in the table below Codec Bitrate Range MP3 16 to 320 kbps AAC LC 24 to 320 kbps HE AAC 24 96 kbps HE AAC v2 24 96 kbps Transport AAC audio encoding does not include a container for packaging the data stream as part of it s format but instead allows for a choice of transport to define the container The most common container for AAC data on a personal computer is MP4 This is the technique used by iTunes for m4a audio files F
37. ne or the other bank to be the active The dual firmware options allow for a firmware image to be tested for proper application If a new firmware image is installed and then produces undesir able results ProSTREAM can be rebooted to the previous software bank to restore prior functionality Firmware is delivered via a single compressed tgz file From the system page of the web interface the Update Software button will bring up a file browser where the new firmware image file can be updated to the software bank Once uploaded ProSTREAM can be rebooted to the new software bank All existing configuration options will remain intact 4 Streaming Servers Streaming Servers A streaming server or relay must be a component of any ProSTREAM connected streaming solution The streaming server can be either free software from the Internet community or a paid service from a provider While ProSTREAM is capable of serving streams directly a streaming server instance should be utilized for clients to connect to the encoded stream ProSTREAM is NOT designed to serve direct client requests ProSTREAM has audio outputs as well as inputs There are stereo male XLR analog outputs mounted on the rear panel of ProSTREAM Livewire IP audio input outputs or optional AES EBU inputs and outputs The audio output direct from ProSTREAM does not reflect the encoded audio that comes from the stream container but instead represents the full bandwidth audio feeding th
38. nts can be heard live during selection either via the rear XLR outputs or via headphones by pressing the headphone volume knob and selecting Listen to output audio Codec Select Codec MP3 MP3 Channels Stereo and MP3 Bitrate 128 9kilobits sec from the Codec menu asa good test stream Streaml Set the Stream1 menu options as follows SHOUTcast Server Address SHOUTcast DNAS root URL I E 192 168 0 9 8800 SHOUT cast Password Telos This is the password to access the streaming server set in the sc_serv conf file Stream Name ProSTREAM test The Stream Name can be anything and should be something This is the source title for playlists etc Stream Genre test SHOUTcast DNAS does require the genre field be set to a value Now you can listen to your encoded web stream The output or encoded audio can be heard by connecting to ProSTREAM with a client audio application Use a program like VLC or WinAMP to open the network stream connection to port 8000 at ProoSTREAM s IP address I E 192 168 0 10 8000 or open the internal web configuration page The main configuration page will include playlist links to connect to ProSTREAM s internal mini server ProSTREAM will automatically attempt to connect to any configured stream servers When ProSTREAM is connected updating the status webpage for SHOUTcast DNAS should yield Server Status Server is currently up and public 4 Section 1 Status Song History i St
39. ny way When the product exhibits a distinct change in performance outside of normally operating specifications Replacement Parts When replacement parts are required be sure the service technician has used replacement parts specified by the manufacturer Unauthorized substitutions may result in fire electric shock or other hazards Safety Check Upon completing of any repairs to this product ask the service technician to perform safety checks to determine that the product is in proper operating condition Cleaning Do not use liquid cleaners or aerosol cleaners Use only a damp cloth for cleaning the exterior of the product only
40. o at incomprehensibly high ratios of compression When selecting a codec there is a trade off between more modern compression standards which sound much better than older standards but may risk incompatibility with older client software and devices The core of this choice will likely be between MP3 MPEG Audio Layer IIT and the newer and aptly named Advanced Audio Coding AAC MPEG 4 with MPEG 2 components Many factors may be considered when choosing a codec to employ for the output stream Is content mostly vocal or musical How is the processor tuned What types of clients are connecting to the audio stream Compression Codec It is generally accepted that AAC performs better and is the codec of choice It is rare to find clients which are MP3 only a decade after the AAC codecs became standard but they do still exist MP3 was released in 1993 and as the first digital compression technique to find widespread acceptance is in most all digital stream clients that exist AAC benefited greatly from being the second go at audio compression as it was able to be designed with all that was learned with MP3 AAC also boasts multiple profiles to fit the need of the transmission MP3 The standard for digital audio MP3 is an all encompassing audio compression codec MP3 is the safest choice for decoding compatibility but creates the least clear audio of all codecs available PROSTREAM CONTROLS 19 AAC LC Low Comp
41. on the end user s player or device Capitalization and punctuation of StreamName is fine and will be displayed as such in the end client Stream Genre SHOUTcast DNAS server requires a genre field for all incoming connections While the genre may not be displayed on the end user s device or client application some streaming servers and services may publish the existence of the encoded audio stream in a directory A good example of this is SHOUT cast DNAS which will publish any streams configured as public to http www SHOUTcast com Ss eS Prod REAN Stream 1 Main Configure the parameters for stream 1 below Click the save button when done Target server SHOUTcast Server address 192 168 99 100 8800 e g 192 168 1 23 8000 Stream password Telos Stream name ProSTREAM e g the station name Stream genre test ProStream v1 0 14b Build 2011 07 14 Copyright 2011 TLS Corporation 22 Section 3 System Fl _ae Atl SAA ProT REAN ProStream v1 0 18b Build 2011 07 16 Copyrigh ProSTREAM s firmware is the actual software code which allows the ProSTREAM unit to function The firmware can be periodically updated via images obtainable from Telos Systems The system configuration menu allows ProSTREAM s firmware to be switched and the unit to be rebooted ProSTREAM has two separate internal software banks to which firmware images can be installed The system configuration page allows for selection of o
42. or streaming use a file container is not always appropriate or understood by streaming clients so an alternative container should be used ADTS The default transport container to use for all AAC codecs is Audio Data Transport Stream ADTS ADTS encapsulates the packetized elementary streams of encoded AAC audio and metadata for transport over IP networks 20 Section 3 ADTS CRC ADTS CRC includes CRC error correction and stream synchronization features to the ADTS transport and can be used for maintaining transmission integrity when the signal is degraded ADIF Audio Data Interchange Format ADIF is a transport container more suited to files then streaming as the data stream is preceded with a header packet and then raw AAC data follows ADIF may be used in applica tions where the audio will be muxed with other audio channels for multi channel transport but is not likely to be used in traditional streaming RAW Raw mode will release the AAC data stream without any transport container at all and consists of nothing more than the encoded audio data Metadata Metadata or data about the data metadata includes textual information about the current content of the audio stream such as track title and can be combined with the audio stream for delivery to end clients The artist current program titles or branding and can also include a URL to associate with the stream Most end clients which are used to play t
43. plate files used by ProSTREAM are PROSTREAM CONTROLS 21 scripts written in Lua a free open source scripting language More information on Lua scripting can be found at the official Lua website at http www lua org v Status Streams ProSTREAM can be configured to push connect to up to four separate streaming servers Target Server Set the target server to match the required streaming server protocol SHOUTcast Set the target server to SHOUT cast SHOUTcast Server Address The SHOUT cast server address should be set to the source URL for the streaming server software Once set the ProSTREAM will attempt to open a connection to this network location Once the connection pipeline is established the ProSTREAM will push the encoded audio muxed together with the streaming metadata Depending on the configuration of the streaming server it will accept incoming requests from the Internet to access the stream SHOUTcast Server Password Most streaming software and services require an authentication password in order to accept an incoming data stream In the case of SHOUTcast DNAS steaming server this is the value of password value used in the SHOUTcast DNAS sc_serv conf file used to launch the SHOUT cast server instance This password is typically case sensitive Y Stream Name When an Internet user or device connects to the stream the Stream Name will be sent in the initial meta data burst This title is typically displayed
44. r s settings are loaded into the processing structure and applied to the input audio Presets allow different processing setups to be loaded into the processor The following factory presets have been provided as starting points for customizing your sound Music 24kbps Music 32kbps Normalize 4 PhatOne Smooth Sparkle Squashed Talk 24kbps Talk 32kbps Talk Note Itis possible to gain dramatic sonic improvement from ProSTREAM s Omnia processing right away We suggest that an easy way to get started is to choose one of the factory presets and then customize it to suit your own aural taste Processor Adjustment Procedure 1 Review the aural objectives for the post processed audio 2 Start with an Omnia preset and adjust processor values in small increments 3 Listen to the post processed audio then adjust and listen again Aural evaluation should occur over time not in short moments 4 While making changes to the system tweak levels in small increments Do not make too many differ ent adjustments all at once Multiple adjustments at once can make for more difficult determination of what affected an aural change Make changes in increments of no more than 0 5 dB or 1 dB or in 1 or 2 step increments Turn functions on and off to better determine their affect on the audio 5 Sleep onit Spend time adjusting and then listening and when the system gets to a point where it sounds good stop When makin
45. ream URL Admin Login Current Stream Information Server is currently up and public Stream is up at 192 kbps with 0 of 32 listeners 0 unique 0 Om 01s Stream Title ProSTREAM test Content Type audio mpeg Stream Genre test Stream URL Stream AlM Stream IRC Current Song Written by Stephen Tag Loomis Tom Pepper and Justin Frankel 1995 2004 The stream can now be heard with a streaming player by connecting to the SHOUT cast base URL or by clicking on the Listen link 2 Controls and Connections Overview The Telos ProSTREAM is very simple to set up and use having a minimal amount of controls and easy intuitive interface Here we ll take a look at the front and rear panels of your ProSTREAM Here s what you ll find inside your packing box Telos Systems ProSTREAM unit Telos Systems ProSTREAM manual warranty reregistration form Y warranty information sheet IEC 320 power cords Euro 220v amp US 110v network cable CatSe 7ft RJ45 to RJ45 DB25 Female Solder Cup DB25 Plastic Hood 9 10 rack screws User Interface 179 a 1 Power LED The blue power LED is located to the upper left of the display When the unit is first powered the power LED will flash until the unit is fully booted when the power LED will light solid d 2 Display Screen The OLED display screen will display when the unit is operational Use the display control knob and return button to navigate
46. t be authorized by Telos Systems If Telos Systems authorizes the performance of warranty service the defective Product must be delivered shipping prepaid to Telos Systems 1241 Superior Avenue East Cleveland Ohio 44114 Telos Systems at its option will either repair or replace the Product and such action shall be the full extent of Telos Systems obligation under this Warranty After the Product is repaired or replaced Telos Systems will return it to the party that sent the Product and Telos Systems will pay for the cost of shipping Telos Systems authorized dealers are not authorized to assume for Telos Systems any additional obligations or liabilities in connection with the dealers sale of the Products oF A2 PROSTREAM AUDIO SPECIFICATIONS Line Input THD N Pro Pro Freq Response Head Room Dynamic Range Crosstalk Output Clipping Output Impedance Input Impedance Analog to Digital Converter Digital to Analog Converter Power 4dBu input lt 0 03 12dBu 1 kHz Sine 1dB 25 20 kHz 18dB gt 87dB Unweighted gt 90 dB A Weighted Over 80 db 22dBu 50 Ohm differential 6K Ohm differential 24bits 24bits 115Vac 14 2 Watts 29 A3 Safety Notification 10 11 12 13 This symbol wherever it appears alerts you to the presence of uninsulated dangerous voltage inside the enclosure voltage which may be sufficient to constitute a risk of shock
47. y common Internet network infrastructure Telos Systems licenses Motion Picture Experts Group MPEG compression codecs from Fraunhofer IIS http www iis fraunhofer de en bf amm produkte audiocodec and includes the codecs as a source component of ProSTREAM Lossless encoding like a ZIP or DMG file on a computer allow an end user to un compress the data and restore all of the original information In order to gain much greater compression ratios audio compression employs lossy compression or encoding by making certain assumptions about human hearing For instance a CF note played by a guitar at 85 db of power overpowers a C harmonic of a keyboard at 30 db of power so the 30db signal is minimized or tossed Lossy compression relies upon subjective process thus there are many techniques to digitally compress audio and there are many more opinions as to which are best In anticipation ofthe need for compression algorithms the Motion Picture Experts Group MPEG http mpeg chiariglione org was formed by the International Standards Organization ISO http www iso org and the International Electro mechanical Commission IEC http www iec ch to address the needs of digital compression Their research has yielded the codecs licensed and used by ProSTREAM MPEG has released different standards as technology has required and each successive standard has built upon the previous yielding modern codecs which can deliver extremely clear audi
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