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NICA X Reference Manual

Coding Mode

Coding Delay

APT 64k mono

~ 13mS

APT 256k stereo

~ 5mS

APT IMUX 2 x 64k mono

~ 13mS

APT 64k mono over ISDN (local call)

~ 17mS

3.1.1.3 – Auto Synchronisation

When operating in a CLEAR Date Mode, the NICA X sets the auto synchronisation mode of the apt-X100 chip to

automatically synchronise to the incoming data stream. In an IMUX mode the Autosync is not required as the

IMUX process itself deals with the synchronisation of the audio data stream.

3.1.1.4 - CLEAR Mode

CLEAR mode will only operate at 64kbit/s on 1 channel of ISDN to give 7.5kHz mono audio. On a fixed data

service such as a Kilostream, Satellite link or Microwave link, the NICA X can operate at either 64k, 128k or 256k.

The clock can be provided by the network or internally by the NICA X.

The CLEAR mode enables the unit to operate with other products using aptX-100 coding on just 64kbit/s.

3.1.1.5 - IMUX Mode

The IMUX mode employs APT's inverse multiplexing technique known as MUCAS. This links two 64kbit/s channels

together, taking into account any delays between the two data stream clocks and any slippage, to give a 128kbit/s

data stream which the codec can then utilise.

In IMUX mode the NICA X will operate at 7.5kHz mono over 64kbit/s, 15kHz mono over 2x64kbit/s and 7.5kHz

stereo over 2x64kbit/s.

3.1.1.6 - Stereo/Mono Operation

In CLEAR mode the NICA X can operate in mono over 64kbit/s, mono or stereo at 128kbit/s, and stereo only at

256kbit/s.

With IMUX modes the stereo operation is only relevant for 2 x 64kbit/s data channels. To operate in stereo mode

in IMUX, only one unit needs to be set to stereo as the other unit will automatically change to stereo.

In IMUX mode the NICA X can operate in mono mode at 7.5kHz audio bandwidth over 64kbit/s and 15kHz audio

bandwidth over 2x64kbit/s. In IMUX mode the NICA X can operate in stereo mode at 7.5kHz audio bandwidth over

2x64kbit/s.

If the unit is operating in stereo mode and one 64kbit/s data channel is lost, then the unit will continue to operate

at 7.5kHz mono.

The table below summarises the variations.

Data

64kbit/s

IMUX mode

2 x 64kbit/s

IMUX mode

Mono

mode

7.5kHz

15kHz

Stereo

mode

7.5kHz

Mono

7.5kHz

Stereo

3.1.1.7 - Auxiliary Data

Quick Reference Table

MEANS OF

CONTROL

REMOTE

CONTROL

DIP SWITCHES

ACTION

- SYSTEM-CONFIG

- 6.AUXDATA

AUX

6,7,8

If enabled the auxiliary data uses part of the audio data stream. Therefore the audio quality is slightly affected by

the reduction in data bits used to represent the audio. The higher the baud rate, the more data is "stolen" from

the audio data. The apt-X100 Codec can operate at 1200, 2400, 4800, 9600 baud rate.

The auxiliary data channel within the audio data stream is only active when enabled. It will only operate with

another codec which has the auxiliary data enabled. The baud rate between two units is determined by the unit

with the highest setting. The auxiliary data can be used in any mode e.g. Mono/Stereo, CLEAR/IMUX

NOTE:

If a codec has the auxiliary data enabled and connects to a codec with it disabled the audio will be

corrupted.

Содержание NICA X

Страница 1: ...NICA X Codec System Reference Manual ...

Страница 2: ...endor Sonifex Ltd shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual Sonifex Ltd reserves the right to revise the information in this Manual from time to time without notice No part of this manual may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying recording informa...

Страница 3: ...cs 6 3 1 1 1 Modes For apt X100 6 3 1 1 2 Coding Delays 6 3 1 1 3 Auto Synchronisation 7 3 1 1 4 CLEAR Mode 7 3 1 1 5 IMUX Mode 7 3 1 1 6 Stereo Mono Operation 7 3 1 1 7 Auxiliary Data 7 3 1 1 8 Compatibility 8 3 1 2 MPEGL2 G 722 Codec Specifics 8 3 1 2 1 Modes For MPEGL2 8 3 1 2 2 G 722 Coding 8 3 1 2 3 MPEGL2 Coding 8 3 1 2 4 Coding Delays 8 3 1 2 5 Stereo Mono Operation 9 3 1 2 6 Compatibility ...

Страница 4: ...rs CBN 42 Configure Backup Monitor Settings CBM 42 Configure Backup Primary Settings CBP 42 Configure Backup Reserve Settings CBR 43 Configure Backup Switch Backup CBS 43 Configure Call Timeout Setting CCT 43 Configure System PINS PST 43 Configure TA Answer Option CTA 44 Configure TA Call Permit Numbers CTN 44 Configure TA Channel Settings CTC 44 Edit Book Entry BKE 44 Enable Disable LoopBack LBK ...

Страница 5: ...issions 52 B 6 TA Module 52 B 7 Safety Approval Notice 52 Appendix C The apt X100 Audio Data Compression System 53 C 1 Introduction 53 C 2 Linear PCM Digital Audio Coding 53 C 3 Characteristics Of Audio 53 C 4 ADPCM Audio Coding 54 C 5 Sub Band Coding 54 C 6 Backward Adaptive Quantisation 54 C 7 Linear Prediction 54 C 8 apt X100 Sub Band ADPCM 55 C 9 Inherent Properties 55 Appendix D Specification...

Страница 6: ...NICA X Reference Manual ...

Страница 7: ...loyees whilst in the course of their employment or its agents in the course of the agency ii for any breach by the Company of any statutory undertaking as to title quiet possession and freedom from encumbrance d Subject to conditions a and c from the time of despatch of the Goods from the Company s premises the Purchaser shall be responsible for any defect in the Goods or loss damage nuisance or i...

Страница 8: ... This equipment has been designed to meet the safety regulations currently advised in the country of purchase and it conforms to the safety regulations specified by use of the CE Mark The power supply is rated to 90 250VAC at 47 63Hz Warning There are no user serviceably parts inside the machine If you should ever need to look inside the unit always disconnect the mains supply before removing the ...

Страница 9: ...cards are installed in a single NICA X unit the user can operate the system either as two discreet codecs or as one codec capable of auto detecting any incoming mode for example an auto detect G 722 MPEG L2 apt X100 codec 1 1 2 Line Interfaces The NICA X can be operated on X21 and or ISDN S Bus line interfaces On the X21 connection the NICA X can be connected to a fixed point to point digital serv...

Страница 10: ...1A NO YES NO NO 1U NO NICA X 1M NO NO YES NO 1U NO NICA X 1AT YES YES NO NO 1U NO NICA X 1MT YES NO YES NO 1U NO NICA X 2A YES YES NO NO 2U YES NICA X 2M YES NO YES NO 2U YES NICA X 2AM YES YES YES NO 2U YES NICA X 2MM YES NO YES YES 2U YES NICA X 2AX NO YES NO NO 2U YES NICA X 2MX NO NO YES NO 2U YES NICA X 2AMX NO YES YES NO 2U YES NICA X 2MMX NO NO YES YES 2U YES ...

Страница 11: ...ction 3 2 This port can be set to operate at 56kbit s or 64kbit s 2 3 ISDN S Bus The ISDN S Bus RJ45 connector should be connected to the ISDN2 termination box using the cable provided Note The ISDN TA is optional in both NICA X 1 and NICA X 2 units 2 4 RS232 Remote Control Port The RS232 Remote Control Port connector is a 9 way D type female connector The supported signals are RXD TXD and GND The...

Страница 12: ...supply 4 75 12 6V or using the supply voltage 12V nominal provided on the External Input connector ion 1 5mA min imax 10mA Isolation Voltage 48V max Excitation Voltage 4 75 15V max The External Inputs can be programmed to perform any command in the system Some common uses are to Trigger dialling Book entries Change Codec Mode Trigger Backup functions COMMON IN1 R 4 75 12 6V Isolated Switch Inputs ...

Страница 13: ... have synchronised framed to the incoming clock and data These will only illuminate if the correct format data is present i e the correct type of codec is at the remote end for the mode set at the NICA X If in Autodetect Mode these indicators will flash whilst the unit is hunting for the correct Mode This only occurs when an ISDN call is active or an X 21 interface is active See sections 3 1 1 1 a...

Страница 14: ...ifics The following information is relevant to NICA X units fitted with an apt X100 codec card 3 1 1 1 Modes For apt X100 Quick Reference Table MEANS OF CONTROL MENU REMOTE CONTROL DIP SWITCHES ACTION CONFIG MODE MOD 9 10 11 12 The tables below list the Codec Modes for apt X100 versions apt X100 Mode Name Max Audio Bandwidth Audio Mode Data Rate kbit s Data Mode Data Interface 0 None Set 1 Auto De...

Страница 15: ...ereo only at 256kbit s With IMUX modes the stereo operation is only relevant for 2 x 64kbit s data channels To operate in stereo mode in IMUX only one unit needs to be set to stereo as the other unit will automatically change to stereo In IMUX mode the NICA X can operate in mono mode at 7 5kHz audio bandwidth over 64kbit s and 15kHz audio bandwidth over 2x64kbit s In IMUX mode the NICA X can opera...

Страница 16: ...to encode decode There is only one mode associated with G 722 which gives 7 5kHz mono audio over 64kbit s The sample rate is 16kHz Note It is a feature of statistical framing that a G 722 decoder will not frame to silence Therefore audio must be input to the encode end for a decoder to frame Also G 722 coding does not encode 1kHz tones very well 3 1 2 3 MPEGL2 Coding ISO MPEG 1 Layer II ISO IEC 11...

Страница 17: ...set i e apt x100 or MPEGL2 If in an MPEG mode a clock must be available i e an ISDN call must be active or an X 21 active or the internal clock enabled When in loopback the unit cannot link to a remote codec 3 1 4 CH1 Mic Or Line Input Quick Reference Table MEANS OF CONTROL MENU REMOTE CONTROL DIP SWITCHES ACTION SYSTEM CONFIG 5 OPTIONS 1 AUDIO OPT 4 A microphone can be connected directly to a NIC...

Страница 18: ...the NICA X internal codec can only operate on channel 1 of the ISDN 3 3 Dip Switches NICA X 1 Quick Reference Table MEANS OF CONTROL MENU REMOTE CONTROL DIP SWITCHES ACTION None RSW There is a row of 12 DIP switches on the front of the NICA X 1 allowing a number of parameters to be set A cover plate is provided to cover the DIP switches to avoid tampering Note that the mode settings for the codec ...

Страница 19: ...X type mode setting Audio Input XLR CH1 Audio Input XLR CH2 Audio Output XLR CH1 Audio Output XLR CH2 NICA X 1A 1AT 2A APT CH1 APT CH2 APT CH1 APT CH2 NICA X 1M 1MT 2M MPEG CH1 MPEG CH2 MPEG CH1 MPEG CH2 NICA X 2AM Ch 1 APT mode Ch 2 no mode APT mode APT CH1 APT CH2 APT CH1 APT CH2 NICA X 2AM Ch 1 MPEG mode Ch 2 APT mode MPEG CH1 APT CH1 MPEG CH1 APT CH2 NICA X 2MM Ch 1 MPEG1 mode Ch 2 no mode MPE...

Страница 20: ...ell as the local codec The external input command will override the DIP Switch settings currently set on a NICA X 1 unit The external inputs are programmed either from the front panel keypad and display see section 5 NICA X 2 or from the remote control port see section 8 In a new system they are factory set to perform dial of BOOK entry 101 on input 1 through to dial BOOK entry 108 on input 8 Thes...

Страница 21: ...hanges The System Configuration PIN is required to access the System Configuration menus 3 9 Remote Inband Control Quick Reference Table MEANS OF CONTROL MENU REMOTE CONTROL DIP SWITCHES ACTION SYSTEM CONFIG 7 REMOTE REM 3 Chapter 8 details the remote control commands available to the user on the RS232 Remote Control Port Using the auxiliary data channel the NICA X can also control the remote end ...

Страница 22: ...e Subscriber Numbering MSN Quick Reference Table MEANS OF CONTROL MENU REMOTE CONTROL DIP SWITCHES ACTION SYSTEM CONFIG 1 ISDN TA CONFIG CTC The Multiple Subscriber Number MSN can be set for Channel 1 and Channel 2 MSN is used where specific devices on an ISDN line need addressing This may be the case if two pieces of ISDN equipment are sharing the same ISDN line and need to be independently addre...

Страница 23: ... as the CPN matches any of the BOOK entries in the NICA X NUMBERS allows 10 numbers to be programmed into the System and the incoming call will only be Permitted if the CPN matches any of the 10 numbers MANUAL allows a remote control command to answer the call NONE prevents incoming calls from being answered 4 6 Dialling Prefix Quick Reference Table MEANS OF CONTROL MENU REMOTE CONTROL DIP SWITCHE...

Страница 24: ...dle or not in use Busy Channel busy performing a function in between states Out 384050 ISDN Call is active made outgoing manually to number displayed Out WRFM ISDN Call is active made outgoing from Book name displayed In ISDN Call is active made incoming no Called Party Number In 517120 ISDN Call is active made incoming from number displayed In WRFM ISDN Call is active made incoming from number ma...

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Страница 28: ...ke up a single channel In a single MPEG unit or a dual APTX MPEG unit the MPEG and G 722 modes are only available for channel 1 In a dual MPEG unit they are available independently for the two channels NOTE The Mode Configuration sets the required Mode The Mode actually running is displayed in the Top Menu Single APTX Version With the NICA X 1A or NICA X 2A APTX version the CH1 mode only needs to ...

Страница 29: ...and select the correct coding Mode This will be displayed as the running Mode in the Top Menu The Auto Detect feature allows two NICA X units to be in Auto Detect Mode and connected together over ISDN The units will frame to the best coding Mode where the best is defined as 2 channel 15kHz mono audio for apt X100 1 channel 24kHz sampling 10kHz mono audio for G 722 MPEGL2 5 4 Making An ISDN Call Qu...

Страница 30: ...lls to the correct port or terminal equipment on an ISDN line The remote terminal equipment must have a sub address defined An incoming call with a sub address element present will be checked against the sub address defined If they match the call will be answered If they do not match the call will not be answered If the remote equipment does not have a sub address set or if the sub address element...

Страница 31: ...ngestion Switch Congestion 43 access information discarded Call failed 44 requested channel not available Call failed 47 resources unavailable Resources Not Avail 49 quality of service unavailable Quality Not Avail 50 requested facility not subscribed Not Subscribed 57 bearer capability not authorised Capability Not Auth 58 bearer capability not available Capability Not Avail 63 service or option ...

Страница 32: ... digits The optional settings in the BOOK entry are the codec Mode to be used the Data Rate of the ISDN and the Auxiliary Data setting If the Mode of the codec is set in a book entry when the book entry is used the Mode may be changed from the current default Mode Therefore when the BOOK entry is then cleared down the Mode will be set back to the default If the NICA X is used as two independent co...

Страница 33: ... to fine tune their operation The table below gives an overview of this Parameter Options Backup Enable NORMAL BACKUP SM2 Primary Mode Any codec mode or none set none set indicates primary service is external Primary Channel 0 1 2 1or2 1 2 Primary No s ch1 ch2 ISDN numbers If primary Mode is on ISDN Reserve Mode Any codec mode Reserve Channel 0 1 2 1or2 1 2 Reserve No s ch1 ch2 ISDN numbers A and ...

Страница 34: ...h set The A number s are tried first If the NICA X fails to connect with these number s after the set number of retries it will then use the B number s Fail Detect The Backup operation is continually checking to see if it must activate the Reserve service depending on the state of the option selected here The options and their activation criteria are listed below The Fail detect must be active for...

Страница 35: ...e Reserve service will be activated If the Reserve service is activated but fails to connect or frame the system reverts to trying the Primary service Up Time When the Reserve service is operating this is the value reloaded into the countdown timer while Restore Detect is false While the Restore Detect is true the timer will count down If the timer expires then the Primary service will be activate...

Страница 36: ...ISDN IMUX M 3 APT ISDN IMUX M Reserve Channel 1 2 1 2 Reserve No s 1 01933651819 2 01933651819 1 2 Fail Detect Frame Frame Restore Detect External External Down Time 10 seconds 10 seconds Up time 10 seconds 10 seconds Silence Level n a n a Number of retries 2 0 Monitor function OFF OFF Monitor Time n a n a Setup Commands Using the Remote Control Port Transmitter Unit Studio Unit 0 CBP8 1 0 CBR3 4 ...

Страница 37: ...nit as long as they are set to compatible coding Modes If separate units were used for Primary and Reserve they would not have to be in Backup Mode If the same NICA X unit was used remotely to provide Primary and Reserve then it would have to be in Backup Mode with the same settings as below Parameter Setting Backup Enable BACKUP Primary Mode 8 APT X21 256K S Primary Channel 1 Primary No s n a Res...

Страница 38: ...e is provided by an external system and the Reserve service is provided by the NICA X using ISDN IMUX on 2 channels see figure section 7 4 backup diagram In this example the Audio Switch Module option is fitted The Audio Programme feed from the primary external service is input into the CH1 and CH2 input connectors of the NICA X and the Audio Switch Module loops this through to the output connecto...

Страница 39: ...NF The unit is monitoring the Primary service and the Primary service is active Primary On FAIL Reserve Off P M00 R M03 PRIM RES CONF The failure detector detects that Audio has failed on channels 1 and 2 Primary Off FAIL Reserve On BUSY P M00 R M03 PRIM RES CONF After the set Down Time the NICA X automatically dials the Reserve Numbers Primary Off Reserve On ACTIVE P M00 R M03 PRIM RES CONF The u...

Страница 40: ...he return audio path is not used The two audio channels are described as Channel 1 and Channel 2 General Definitions Channel 1 controlled by Local end unit opto input 1 External Input connector Channel 2 controlled by Local end unit opto input 2 External Input connector Channel 1 Remote Relay contact at Remote end unit Relay 3 External Input connector Channel 2 Remote Relay contact at Remote end u...

Страница 41: ...s The Alarm relays are fixed in software as Relay 6 for channel 1 Relay 7 for channel 2 When the external I P 0 open the relay contact and go to OFFLINE 6 6 2 User Interface When the NICA X is in SM2 mode the top level display is as below 1 Idle 2 Out 01933651819 1 OFF 2 ONLINE CONF The first two lines show the connection state of the two channels the same as in the Normal mode The next line shows...

Страница 42: ...meters marked may or may not affect operation and operation can only be guaranteed with them set as shown Remote Unit Configuration The Mode of Channel1 and Channel2 should be set to 15 G722 ISDN M To give the codecs signal bits control over their respective relays External I P Bits Parameter Value Type Signal 1A 0 REL3 1 Latching Signal 1B 0 REL3 0 Latching Signal 2A 0 REL4 1 Latching Signal 2B 0...

Страница 43: ...NICA X Reference Manual 35 CHAPTER 7 APPLICATION DIAGRAMS ...

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Страница 48: ...nswers within 7 seconds and never transmits except in answer to a received message The end style sent by the NICA X matches that received if no valid end was detected no answer is sent The PC must not start sending another message until the last character of the previous response has been fully received or 7 seconds have elapsed since the last message was sent and no reply was received All command...

Страница 49: ...X unit id CBE enable RESPONSE respcode enable PARAMETERS enable 0 disable backup operation 1 enable backup operation 2 enable special SM2 operation EXAMPLE PC 0 CBE1 NX 00 i e Set the unit into backup mode the NICA X accepts the command and reports back the current settings Configure Backup External Input CBI DESCRIPTION Indicate the state for the external detector SYNTAX unit id CBI state chno RE...

Страница 50: ...code id num ISDN number PARAMETERS id num ISDN id number one of 1 Primary mode channel 1 number 2 Primary mode channel 2 number 3 Reserve mode channel 1 number pair A 4 Reserve mode channel 2 number pair A 5 Reserve mode channel 1 number pair B 6 Reserve mode channel 2 number pair B isdn number ISDN calling line identification number up to 24 digits EXAMPLE PC 0 CBN3 01933651819 NX 00 3 0193365181...

Страница 51: ...Timeout Setting CCT DESCRIPTION Configure the call timeout setting SYNTAX unit id CCT timer dial time RESPONSE respcode timer dial time PARAMETERS timer one of 0 disable call timer 1 7 set call timer to one of the times shown below timer value time set 1 5 minutes 2 10 minutes 3 30 minutes 4 1 hour 5 2 hours 6 5 hours dial time time allowed for TA to establish an ISDN call 1 99 seconds EXAMPLE PC ...

Страница 52: ...buzz call in 0 disable buzz 1 enable buzz EXAMPLE PC 0 CTC1 0 1 123 1 NX 00 1 0 1 123 1 i e Set channel 1 of the TA to have 64k data rate no msn using B1 with a sub address of 123 and buzz on calls in the NICA X accepts the command and reports back the current settings Edit Book Entry BKE DESCRIPTION Edit the settings for a specified book entry SYNTAX unit id BKE book name number1 number2 main mod...

Страница 53: ...on number and serial number for the system SYNTAX unit id INF RESPONSE respcode 0 product name PARAMETERS product name the name of the product and revision number of the software EXAMPLE PC 0 INF NX 00 NICA X 1 2 i e Request product information the NICA X accepts the command and reports back the product information Interface Revision IFR DESCRIPTION The interface revision of the NICA X remote cont...

Страница 54: ...ue then the response code will be 02 parameter3 third parameter if there is a fault with this value then the response code will be 03 EXAMPLE PC 0 NUL1 3 NX 00 1 2 3 i e The command is presented with parameter 2 missing the NICA X accepts the command and returns the values of all the parameters PC NUL1 6 3 NX 02 i e The command is presented with parameter 2 incorrect the NICA X rejects the command...

Страница 55: ...relay states SYNTAX unit id ROP RESPONSE respcode relay system user PARAMETERS relay a string of 8 characters 0 or 1 representing the state of the actual relays system a string of 8 characters 0 or 1 representing the factory default states for relay use auto a string of 8 characters 0 or 1 representing the programmed states for relay use where 0 inactive 1 active EXAMPLE PC 0 ROP NX 00 11110000 11...

Страница 56: ...OD main mode secondary mode RESPONSE respcode main mode secondary mode PARAMETERS main mode a valid mode number secondary mode a valid mode number EXAMPLE PC 0 MOD0 15 NX 02 i e Set the secondary codec mode to mode 15 the NICA X rejects the command due to an error with parameter 2 Signal Private User SPU DESCRIPTION MPEG modes have a Private User bit available for application dependent in band sig...

Страница 57: ...XAMPLE PC 0 STP0 NX 00 i e Stop calls on both channels of the TA the NICA X accepts the command System Reset RES DESCRIPTION After a short delay reboot the NICA X SYNTAX unit id RES RESPONSE respcode PARAMETERS EXAMPLE PC 0 RES NX 00 8 5 Response Codes Response Codes are as follows Code Description 00 OK 01 10 Parameter 1 10 error 21 Invalid Command 22 Rejected 23 Security Level 24 Invalid Pin 25 ...

Страница 58: ...he rear of the unit is a 9 way D type male connector The minimum connections required are RX TX and GND This provides access for two auxiliary ports Pin Signal Type Description Example PC Connection 1 AUX2 TXD Input Transmit Data 2 AUX1 RXD Output Receive Data 2 3 AUX1 TXD Input Transmit Data 3 4 5 SG Signal Ground 5 6 AUX2 RXD Output Receive Data 7 APT CTS Output Clear to Send 8 APT RTS Input Req...

Страница 59: ...erminated in D type connectors must use screen cable with screened connector hoods The screen should be connected to the D shells The Opto Input connector is a 15 Way D type female connector These inputs are programmable Pin Opto Input 1 12V 2 COMMON 3 Opto IN 2 4 Opto IN 4 5 Opto IN 6 6 Opto IN 8 7 GND 8 GND 9 12V 10 Opto IN 1 11 Opto IN 3 12 Opto IN 5 13 Opto IN 7 14 GND 15 GND Thermal Fuse prot...

Страница 60: ...to the unit These ferrite clamps are provided with the unit and must be fitted on any cable connected to the unit The Large ones must be fitted to X21 cables while the small ones must be fitted to audio cables The ISDN cable will be supplied with an integral ferrite which must be used B 6 TA Module This product uses an internal Teltrend Midas plus module B 7 Safety Approval Notice The MIDAS PLUS m...

Страница 61: ...edia can be eliminated as can multiple generation degradation and performance criteria such as frequency response and distortion can be better controlled and therefore virtually guaranteed However the problems created by the very much higher frequencies required to code audio digitally coupled with the necessity to maintain the original integrity of the code throughout any processing inhibit and c...

Страница 62: ...e ear The system automatically adjusts the band edges to changes in sample rates It is important to note that the bottom band always covers the most critical area of the spectrum for any hi fi music application so that the musical fundamental frequencies are coded as accurately as possible Low bit rate Sub band ADPCM coding alone as so far described cannot be relied upon to produce audible transpa...

Страница 63: ...ocessing technology has made it possible to code and decode audio in real time LOW CONSTANT CODING DELAY By operating in the time domain to analyse the audio signal the amount of backward information required to optimise the predictors is relatively small giving the advantage of a minimal coding delay The calculations are made accurately over a fixed 122 samples making the total constant codex del...

Страница 64: ...dard apt MUCAS 2 x 64kBit s Sample rate 16 24 32 48KHz Bit Error Immunity 1 x 10 4 Auxiliary Data RS232 1200 9600 baud Logic Inputs 8 Opto Inputs Logic Outputs 8 Relay outputs Alarm Output Uses Relay Outputs Backup Switchover Loss of Framing Silence Detector Logic Input Backup Logic User Selectable Audio Routing Relay Option Board ISDN TA Module International Compatibility Digital Interface 2 x X ...

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