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Digigram IQOYA CALL Series, User Manual, Page: 7 / 77

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Summary of Contents for IQOYA CALL Series

Page 1: ...IQOYA CALL IQOYA CALL LE Stereo IP audio codecs for Audio Contribution User manual v0 99 valid from firmware v3 03 December 2015 ...

Page 2: ...ire un risque de choc électrique et toute modification du produit annule votre garantie S il est nécessaire d ouvrir l appareil pour l entretien ou la configuration avancée cela doit être fait par du personnel qualifié après avoir débranché le cordon d alimentation et les câbles réseaux Alimentation Il est primordial de connecter l appareil à une alimentation électrique telle que spécifiée dans ce...

Page 3: ... JAMAIS d essence de nettoyants en aérosols d alcool ou tout autre agent nettoyant volatile N utilisez pas de produits nettoyants abrasifs qui pourraient endommager les finitions métalliques ou d autres pièces Réparation Lorsque l appareil a été endommagé quelle qu en soit la cause ou qu il ne fonctionne pas normalement toute réparation doit être effectuée par du personnel qualifié Transport Avant...

Page 4: ... reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures reorient or relocate the receiving antenna increase the separation between the equipment and the receiver connect the equipment into an outlet on a circuit different from that to which the receiver is connected consult the dealer ...

Page 5: ...r the world Digigram sound cards audio processing software and IP audio and video codecs are conceived with a consistent attention to quality and reliability Broadcasting is one of the world s most demanding industries For that reason manufacturers need to be more and more creative to respond to the industry s continuing evolution Today the Digigram forward thinking R D ethos is harnessing cloud c...

Page 6: ...connections A FIRST USE CASE 1 INSTALLATION 1 1 Front and Back Panel Interfaces 1 1 1 IQOYA CALL Front Panel 1 1 2 IQOYA CALL LE Front Panel 1 1 3 IQOYA CALL and IQOYA CALL LE Back Panel 1 2 Connecting IQOYA CALL and IQOYA CALL LE 1 2 1 WEB access rights 1 2 2 Remote configuration through html pages 1 2 3 Web page layout 2 CONFIGURATION 2 1 Network parameters configuration 2 2 Audio parameters con...

Page 7: ...ard 2 5 7 SD Card Backup 2 5 8 Firmware Update 2 5 9 Change Password 2 5 10 Shutdown Restart 3 MAKING CONNECTIONS 3 1 Principles Using Dual Mono Mode 3 2 Using the Connection Book 3 2 1 Connection books Contacts and Profiles 3 2 1 1 Connection books Network Repository 3 2 1 2 Contacts Principles 3 2 1 3 Profiles Principles 3 2 2 Placing a call using the Connection Book 3 2 3 Placing a call using t...

Page 8: ...ats protocols 5 APPENDIX APPENDIX A AUDIO CONNECTORS APPENDIX B GPIO connectors APPENDIX C Serial port RS232 on DB9 APPENDIX D TYPICAL LATENCY VALUES APPENDIX E AAC SETTINGS FOR STEREO SAMPLES APPENDIX F ENHANCED APT X SETTINGS FOR STEREO SAMPLES APPENDIX G AVAILABLE FEC 8 77 ...

Page 9: ...rtise in audio quality IQOYA CALL and IQOYA CALL LE are built on a robust dedicated hardware platform ARM technology including FluidIP the Digigram IP audio codec engine you can trust Depending on your needs there are several ways of configuring and controlling IQOYA CALL or IQOYA CALL LE The manual at hand will guide through installation configuration and operation For any software related issue ...

Page 10: ...th auto answer for simple infrastructures without SIP Ultra low latency e g typical 10 ms analog end to end with EaptX Superior 24 bit audio quality THD 90 dB Fully independent dual Ethernet access Superior AAC Fraunhofer error concealment Key features Audio performances Sampling frequencies available analog I O 8 kHz up to 96 kHz digital I O AES 22 kHz up to 216 kHz with SRC on inputs Frequency r...

Page 11: ...eyboard 23 key keyboard TFT color screen 220x176 pixels only on IQOYA CALL Status 6 status LEDs 3 colors Stereo headphones output 6 35 mm jack max output level 2x50 mW 2x32 Ω load PC interface Web pages on local web server SNMP v2 monitoring Log file Remote firmware update Audio over IP formats and protocols Audio networking format Full compliance with ACIP EBU Tech 3326 Full compliance with SIP R...

Page 12: ...802 1Q 802 1p DSCP support Connectivity Analog and digital I Os Neutrik XLR 3 IP network 2 Neutrik EtherCon RJ45 for ACIP and Livewire networks 8GPI 8GPO on 2 Sub D25 4GPI 4GPO on CALL LE Auxiliary data 1 Sub D9 RS232 port 1 SDHC Secure Digital High Capacity card slot Environment Size 19 1U rackmount Fanless design for ultimate reliability Power consumption 11W typical 15W max Power supply 100 250...

Page 13: ...ng some ports for UDP forwarding in the router This simple operation will allow the audio stream to reach your equipment in the studio What does this mean Opening an UDP port for RTP audio means opening 2 ports one for audio and another for control The audio port must be an even value greater than 1024 and the two ports must have consecutive values e g 5004 and 5005 Moreover if you plan to use FEC...

Page 14: ...etwork So far so good Now you ll need to kindly ask your IT administrator to perform some port opening on your network router firewall The goal is that all audio packets sent by the remote codec to your studio public address is forwarded to your codec within the studio infrastructure In the router enter the port forwarding menu of the router to define the following forwarding rule for UDP streams ...

Page 15: ...InPort 3 Forward to IP address IQOYA_IP and Port IQOYAInPort 3 In case of SIP communications between the two codecs then the SIP listening port usually UDP 5060 it can be TCP 5060 must also be opened and redirected to your studio codec in addition of the port forwarding above UDP TCP Input port 5060 Forward to IP address IQOYA_IP and Port 5060 15 77 ...

Page 16: ...OYA CALL LE works in symmetrical RTP mode which allows for quick and easy setup of full duplex live audio connections over the internet no SIP required no NAT issues A typical use case of IQOYA CALL LE is the following A remote journalist uses an iPhone with IQOYA MOBILE application for real time live audio transmission towards a radio studio over IP through a 3G connection On the radio site an IQ...

Page 17: ...responding IP audio stream to the IP address and port from which it received the first frame from IQOYA MOBILE In other words the same socket port is used for sending and receiving the RTP audio streams This method allows simple NAT traversal in 95 of use cases and does not require SIP Example Given parameters Radio router public IP address RouterPub_IP IQOYA CALL LE private IP address on the radi...

Page 18: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 INSTALLATION 18 77 ...

Page 19: ...headphones output 2 Headphones output This output makes it possible to A monitor the output to be encoded B monitor the analog input C monitor the digital input D monitor the decoded audio output 3 SDHC card Not supported yet 4 LEDs and LCD screen Allow for status and device parameters 5 Touchpad The touchpad gives access to the direct selection of a contact and allows user to place hang up a call...

Page 20: ...e encoded B monitor the analog input C monitor the digital input D monitor the decoded audio output 3 SDHC card Not supported yet 4 LEDs LEDs management as described below is not implemented yet Power OFF No power GREEN Power OK wired Receive OFF Not configured GREEN OK packets received Blinking GREEN AoIP Transport OK but audio not correctly decoded payload unknown RED GREEN Poor AoIP transport j...

Page 21: ...r AES input or SEND Right not configured GREEN Audio detected and range x dBu RED GREEN Audio detected and range between x 24 dBu RED Clipping OR Bad SEND configuration Right SD Record OFF Default GREEN SD Running eg Recording Blinking GREEN à valider par SW SD OK no transfer eg no recording OK OFF Shutdown GREEN Reset on going Configuration underway data transfer SD XML SNMP html configuration fi...

Page 22: ... on the internal clock of the codec With the internal clock selected the AES receiver uses a sampling frequency converter of 125 dB Push button for enabling disabling the hardware bypass of AES EBU input to AES EBU output If enabled digital inputs are by passed through relays to digital outputs during absence of power supply and when restarting the unit 3 Serial port RS232 interface on DB9 see spe...

Page 23: ...he IQOYA codec to the LAN connect the Ethernet cable to the RJ45 port labeled IP AUDIO The default IP address of the IP AUDIO port Eth0 is 192 168 0 100 This port is enabled by default The default IP address of the IP BACKUP CONTROL port Eth1 is 192 168 1 100 This port is disabled by default Please note that these two Ethernet ports have the same capabilities IQOYA CALL and IQOYA CALL LE embed a w...

Page 24: ...d can only be modified when logged as Administrator 1 2 2 Remote configuration through html pages Open a web browser and type in the address bar the IP address of the IQOYA codec in https mode and hit the Enter key The WEB browser displays a message about security certificate Select the option to continue with this WEB server Enter the username and password to enter the WEB pages For configuring t...

Page 25: ...iguration parameters and services Call Application Page This pop up page is the direct access for the internal call application Fleet Manager Access This button gives direct access to Digigram s IQOYA CLOUD web platform and services The CONFIGURE button above enables configuration actions If pressed one can Apply or Cancel any parameter page edition If not pressed all parameter fields are read onl...

Page 26: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 CONFIGURATION 26 77 ...

Page 27: ...rameters configuration Click on the Network menu Select the network interface you want to configure Eth0 corresponds to Ethernet Interface at rear panel labelled IP Audio Eth1 corresponds to Ethernet Interface at rear panel labelled IP Control Backup Please note that these two Ethernet ports have the same capabilities 27 77 ...

Page 28: ...s Eth0 and Eth1 Select the appropriate mode for the IP interface speed and transmission mode Auto negotiation 10 100 Mbits s half full duplex Enable or disable the DHCP mode according to you network configuration If DHCP mode is Off enter a valid IP address the subnet mask and if necessary the gateway and DNS IP addresses Confirm the settings by clicking on Apply Type the new IP address into the a...

Page 29: ...AN 2 Eth1 VLAN 1 and Eth1 VLAN 2 Enable or disable the VLAN in the Status field Enter the parameters of your VLAN VLAN ID VLAN priority IP address of the equipment in this VLAN and subnet mask Confirm the settings by clicking on Apply From the Preferences page you can view the IP routing table from the menu Network IP routing 29 77 ...

Page 30: ...d table by clicking on Browse and selecting it Click on Apply Another important Network page is the IP metrics page one can find from the Preferences page menu Network IP Metrics This page gives access to all network info regarding reception of the audio packet at the unit level once a communication is established It is very useful for checking the quality of the network or the consistence of the ...

Page 31: ...nual v0 99 In the example below one can see that the 200ms Jitter Buffer set in the unit is way above the 1 ms Jitter measured on the network Once the network parameters are configured it is time to configure the audio parameters 31 77 ...

Page 32: ...channel mono mode enables the use of two independent contribution codecs in Mono The Left audio I O is used by codec 1 Right audio I O is used by codec 2 Please note both codecs are totally independent except for the choice of audio I O format Analog AES and the platform clock source and sampling frequency The following parameters concern the audio decoder receiver Listening port Set the audio dec...

Page 33: ...parameters Type Audio input on the unit is to be chosen between analog and AES input Both analog and AES output are active Input and Output Line levels Input and Output levels can also be set These sliders allow selecting the maximum expected level of the analog input signal on left and right channels in dBu by steps of 0 5 dBu For instance a selected value of 18 means the input signal max value i...

Page 34: ...ameter defines the working sampling frequency of the IQOYA platform If AES In clock is selected the sampling frequency must corresponds to the detected clock Note that received and generated IP streams can carry audio at a different sampling frequency in which case a high quality frequency change is applied When sampling frequency is set to 48 kHz IP streams can be at 48 kHz 32 kHz 16 kHz G722 and...

Page 35: ... 1 NTP These parameters are configurable from the Preferences page in Services menu NTP NTP Service enables NTP date and time synchronization Click on Configure button to be able to modify the parameters Select Yes in Service activation and enter the IP address of the NTP server in Server IP address Two NTP servers can be configured Click on Apply 35 77 ...

Page 36: ...essible through a specific MIB Management Information Block compliant with SNMP V2 protocol In addition of being accessible through web pages all network metrics jitter jitter histogram packet losses duplicated packets are accessible via IQOYA s MIB Proceed as follows to get the SNMP MIB from IQOYA Enable the FTP service from menu PREFERENCES Services FTP Run an FTP client application from your PC...

Page 37: ...re 2 3 6 1 Requirements You first need to create a SIP account on your SIP server or on any server of a free SIP account provider of your choice If you don t know a SIP server ask Digigram support for a test account at Digigram SIP server or try a public SIP server like iptel org Your minimum SIP account parameters are usually name e g myname password e g mypwd SIP proxy address e g sip digigram c...

Page 38: ...ined below Note that manual registration is possible in the call window We recommend Yes Registration Name This is the name used to register your audio codec with the SIP registrar also called SIP server This name is the first part of the SIP URI of your audio codec which generic syntax is name registrar address registrar port where the part in square brackets is optional The SIP URI also called S...

Page 39: ...h IQOYA CLOUD Monitoring application Presence Notification lease Duration between request to the Presence server in seconds Net topology related settings Select your connection type This parameter depends on your network configuration and only impact audio stream not signalisation Complete additional fields if necessary Direct The codec has a public internet address From behind a router firewall s...

Page 40: ...then uses this information to assist in establishing peer to peer IP connectivity While STUN is effective in addressing the NAT issue with most consumer NAT devices routers it doesn t work effectively for many corporate networks Digigram proposes through its broadcast graded SIP Infrastructure to overcome this issue by using media relay servers to facilitate media transport between end points even...

Page 41: ...9 2 3 4 Publish Discovery settings Discovery service is used for discovering and announcing AES67 streams on the network Specific configuration settings for network audio such as AES67 LiveWire Connectivity is detailed in a later chapter 41 77 ...

Page 42: ...her I Os settings are configurable through the Preferences Other I Os Menu 2 4 1 Serial Port Please note these I Os are not available in the current version v03 03a December 2015 2 4 2 GPIO Please note these I Os are not available in the current version v03 03a December 2015 42 77 ...

Page 43: ...tton 2 5 2 Alarms setup Each alarm occurring on the IQOYA can be written in a log file sent as an SNMP TRAP and sent to a GPO Click on Configure to be able to modify the alarms setup For each alarm Select Yes in the Log column if you want to get a trace of the alarm in the log file Select Yes in the Send By Trap column if you want a SNMP supervisor to receive a TRAP for the alarm Select a GPO numb...

Page 44: ...th1 Clock Sync Failed This alarm is significant when the audio synchronization on the NTP clock is enabled This alarm is set when IQOYA is not synchronized on the NTP server clock Audio Clock failed Error on selected audio clock Serial input silent No data received on the RS232 port This alarm is generated only if RS323 tunneling mode is enabled Send serial overflow Overflow of data received on th...

Page 45: ... reached the first block which contains the oldest traces is cleared and new traces are written This guarantees that the user retrieves at least the 1000 latest traces In case an SD card is used the log file is kept on the SD card after a proper restart of the codec Logged messages concerning the platform and generic services are displayed using 3 colors codes black generic info yellow orange warn...

Page 46: ...clicking on the View Device information link To save the Connection Book present in the unit click on Download The Connection Book is downloaded to your PC Upload to device The following operations are possible from the Action drop down menu Upload Configuration file from local disk self explained Upload Connection book file from local disk The Connection Book file can be uploaded from a local dis...

Page 47: ...ent system which allow for connection book and audio profile management but also equipment and stream supervision firmware deployment tool alarm notifications on roadmap This application is based on a fully web based architecture either hosted by Digigram or the client with easy access through any major web browser More info in a following chapter or contact presales digigram com 2 5 5 User Profil...

Page 48: ...encoding format can be specified for each User Profiles Incoming stream settings set if the incoming stream has the same audio encoding settings than the outgoing stream If not one can set parameters for the incoming stream meaning the stream sent back to the codec only apply for Digigram codecs 2 5 6 SD Card IQOYA supports SDHC cards formatted in FAT 32 The SD card is also used during a restart o...

Page 49: ...mware update procedure From Preferences System menu select Firmware update Click on the Configure button From the Action drop down menu select Upload a package Click on Browse button to select the file corresponding to the firmware the patch or the license Click on Apply to start the upload process A status bar is displayed on the top left of the WEB page Audio activity is not stopped during the u...

Page 50: ...lly The following operations are also possible from the Action drop down menu Check previous firmware package this allows checking that the previous firmware version that is stored on the SD card is correct Check last uploaded package this allows checking that the last uploaded firmware version is correct This operation is not useful for the moment and is for future use Install previous firmware p...

Page 51: ...r Read only as described in Chapter 1 2 This page enables the change of password for all users 2 5 10 Shutdown Restart This page allows for restarting remotely the software of the platform reboot and shutting down the software Please note that a remote shutdown will require a manual Power On on the unit for restarting 51 77 ...

Page 52: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 MAKING CONNECTIONS 52 77 ...

Page 53: ...b page through the codec s Call Application page 3 1 Principles In this firmware version both SIP and symmetrical RTP full duplex communications can be established from the Call application page The Call application page enables the user to focus on establishing a connection in a simple manner It is divided in 6 zones as represented in the capture below 53 77 ...

Page 54: ...stination address This zone displays the caller SIP or RTP address The address can be manually entered in this zone or selected from the Contact list below The pen logo on the right side of the zone enables to save the address as a local contact in the unit Contacts List field This zone displays the local contacts or the contacts imported from the Connection Book It also displays the latest receiv...

Page 55: ...button Click to place a call or hang up The capture below represents the Call application page during a communication Please note the Quality on the receiver is estimated using a custom algorithm implying packet loss and late packets It is also possible to display Digigram s advanced metrics as measured by the unit during the call 55 77 ...

Page 56: ...y codec 1 Right audio I O is used by codec 2 Both codecs are totally independent with the following limitations Same choice of audio I O format Analog AES and platform clock source and sampling frequency for both codecs Both codecs share the same Connection Book and the same local User Addresses Synchronized AoIP I Os such as LiveWire or Ravenna AES67 can not be used Simultaneous use of EaptX audi...

Page 57: ...OYA codecs can automatically download the relevant Connection Books For example one can setup one Connection book for a mobile fleet one Connection Book for all in house studio codecs and another Connection Book for a regional branch IQOYA CALL and CALL LE codecs can only download one Connection Book concurrently Network Repository Network repository are usually HTTP HTTPS WebDav repository The ne...

Page 58: ... Profiles Principles A Profile is a set of parameters which define the characteristics of the connection which will be established with the contact at call time A Profile specifies the preferred audio encoding formats to be used during the communication the intended Quality of Service class and optional codec parameters More than one audio encoding format can be specified and arranged as a list At...

Page 59: ...ontacts are displayed in the Contact Lists field Select one contact and eventually the intended address to be used if more than one address is available for this contact Upon selection if a default Profile is defined for this Contact this Profile will automatically be selected One can select an alternate Profile in the Profile field Click on the Call button to establish the conection 59 77 ...

Page 60: ...st IP codec have never been easier Please note the SIP registration status and Contact activity status if available are displayed respectively in the top left corner and near each contact in the contact list The two buttons at the right side of the screen enables for switching between codec 1 and codec 2 in Dual Mono Mode Complete touchpad functionalities will be implemented in future releases 60 ...

Page 61: ... field situations or when IQOYA CLOUD is not reachable it may be useful to create a contact diredctly from IQOYA CALL or CALL LE Just click on the Edit button from Operation page to reach a pop up allowing detailed edition of a contact Please note that the contact will remain in IQOYA local memory 61 77 ...

Page 62: ...he responsive design GUI is particularly suited for mobile platform Android and iOS Digigram SIP Infrastructure is provides a complete SIP signaling infrastructure dedicated for broadcast applications This infrastructure based on established open source software bricks has been specifically deployed by Digigram to meet live professional broadcast requirements such as high availability and redundan...

Page 63: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 63 77 ...

Page 64: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 SPECIFICATIONS 64 77 ...

Page 65: ...ax Net weight 3 1 kg 6 85 lbs Inputs Analog line inputs mono 2 balanced 1 Maximum input level impedance 24 dBu 10 kΩ Digital inputs stereo 1 AES EBU 2 Analog input gain 0 dB to 18 dB in 0 5 dB steps Sampling frequencies available analog 16 kHz up to 96 kHz at 24 bit data quantization digital AES 22 kHz up to 216 kHz using SRC at 24 bit data quantization Dynamic range A weighted Input gain 0 dB 107...

Page 66: ...20 kHz 0 3 dB Additional outputs Stereo headphones 6 35mm jack max 2x50 mW 2x32 ohm load 8 relay GPOs IQOYA CALL LE 4 relay GPOs GPOs characteristics 3 SPDT outputs common norm open norm closed max 220 V DC 250 V AC max 60 W 62 5 VA max continuous switching current 2 A 3 A Connectivity Analog line inputs 2 female XLR 3 Analog outputs 2 male XLR 3 Digital input 1 female XLR 3 Digital output 1 male ...

Page 67: ...nt Network protocols html pages via embedded web server http web server personalized web interface for a flexible management UDP client server to send receive network commands SNMP enables IQOYA to be managed over the network in very large systems 67 77 ...

Page 68: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 APPENDIX 68 77 ...

Page 69: ...onnectors for the analog inputs One for the AES EBU stereo input Audio Out Two male XLR 3 connectors for the analog outputs One for the AES EBU stereo output The pinout used on the XLRs is standard pin 1 carries the signal ground pin 2 carries the positive signal hot pin 3 carries the negative signal cold 69 77 ...

Page 70: ... 21 20 19 18 17 16 15 14 GPI O GPO3 GPO3 GPO2 GPI2 GPO1 GPO1 GPO0 GPI0 Lab el unu sed GND N O COM unuse d N C K N O COM unuse d N C K GND connected to ground N C contact normally closed N O contact normally open COM common contact unused not used DO NOT CONNECT K Optocoupler cathode General Purpose Inputs GPIs The IQOYA GPIs are compatible TTL 5 V The GPIs do not require any external power GPI sta...

Page 71: ...osed N O normally open According to the status applied to the GPO pin N C is connected to pin COM or pin N O is connected to pin COM GPO relay specifications Maximum power switching capability 60 W 62 5 VA Maximum switching current 5 A DC Maximum carrying current 2 A DC Maximum switching voltage 220 VDC 0 24A 60 W 250 VAC 0 25 62 5 VAC 125 VAC 0 5A 62 5 VAC 30 VDC 2 A 60 W Typical life expectancy ...

Page 72: ...B 9 connector on its back panel Use this port to connect any compatible device For pinout allocation details please refer to the figure and table below Pin Description 1 Not connected 2 RxD received data 3 TxD transmitted data 4 Not connected 5 Signal ground 6 Not connected 7 RTS request to send 8 CTS clear to send 9 Not connected 72 77 ...

Page 73: ... LD 160 kbps 38ms AAC 4 ELD 160 kbps 32ms Apt X 24 bits 12ms All measurements taken on stereo samples at 48 kHz Note the lower the sample rate the higher the latency Impact of the network on latency Latency highly depends on the quality of the network Network jitter and packets loss typically have a direct impact on latency Network jitter compensation is achieved by buffering audio data on the dec...

Page 74: ...375 Audio bit rate HE AACv2 SBR PS 16000 HE AACv2 SBR PS 22050 HE AACv2 SBR PS 24000 HE AACv2 SBR PS 32000 14000 56000 8250 Audio bit rate HE AACv2 SBR PS 44100 18000 56000 11369 Audio bit rate HE AACv2 SBR PS 48000 18000 56000 12375 Audio bit rate AAC LD 16000 AAC LD 22050 AAC LD 24000 80000 111999 24750 Audio bit rate AAC LD 32000 112000 320000 33000 Audio bit rate AAC LD 44100 45478 Audio bit r...

Page 75: ...CED APT X SETTINGS FOR STEREO SAMPLES Sampling Frequency Hz Sample Size Audio Format bit s IP stream bit rate bit s 32000 16 bits 256 kb s 344 Kbits s 32000 24 bits 384 kb s 472 Kbits s 48000 16 bits 384 kb s 516 Kbits s 48000 24 bits 576 kb s 708 Kbits s 75 77 ...

Page 76: ... 100 bandwidth recovery 3 2 streams audio FEC 100 bandwidth additional delay of 1 frame recovers 2 consecutive lost packet at 100 recovers 3 consecutive lost packet at 75 100 bandwidth recovery 4 2 streams audio FEC 100 bandwidth additional delay of 4 frames recovers 3 lost packet at 100 recovers 4 consecutive lost packet at 80 50 bandwidth recovery 1 2 2 streams audio FEC 50 bandwidth additional ...

Page 77: ...r Digigram S A 82 84 Allée Galilée 38330 Montbonnot Saint Martin FRANCE Tel 33 0 4 76 52 47 47 Fax 33 0 4 76 52 18 44 E mail info digigram com Digigram Asia Pte Ltd 60 Albert Street 19 11OG Albert Complex Singapore 189969 Singapore Tel 65 6291 2234 Fax 65 6291 3433 E mail info_asia digigram com 77 77 ...

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