Specifications

AMBE-3000™ Vocoder Chip Users Manual
Version 2.8, August, 2011
3.
8.12
Typical AMBE-3000™ Vocoder Chip Power Measurements:.......................................................................26
4 INITIAL DESIGN CONSIDERATIONS..............................................................................27
4.1 Vocoder Speech and FEC Rate Selection ..............................................................................................27
4.2 Interface Selection...................................................................................................................................27
4.3 A/D – D/A Codec chip Selection..............................................................................................................28
4.4 Special Functions Description .................................................................................................................28
4.4.1 Voice Activity Detection & Comfort Noise Insertion......................................................................................29
4.4.2 Echo Canceller (EC_ENABLE TQFP pin120 BGA pin D5)........................................................................... 29
4.4.3 DTMF Dual Tone Multiple Frequency, Detection and Generation................................................................ 30
4.4.4 Soft Decision Error Correction.......................................................................................................................30
4.4.5 Skew Control (SK_ENABLE TQFP pin 6 BGA pin D3) .................................................................................30
4.4.6 Noise Suppressor (NS_ENABLE TQFP pin 7 BGA pin D2)........................................................................... 30
4.4.7 Companding Using A-Law and µ-Law ...........................................................................................................31
5 I/O MANAGEMENT...........................................................................................................32
5.1 Operating Modes.....................................................................................................................................35
5.1.1 Codec mode.....................................................................................................................................................35
5.1.2 I/O Handler in Codec Mode............................................................................................................................36
5.1.3 Packet Mode ...................................................................................................................................................37
5.1.4 I/O Handler In Packet Mode........................................................................................................................... 38
5.1.5 Switching between codec mode and packet mode using packets ....................................................................39
5.2 SPI Interface............................................................................................................................................40
5.3 UART Interface........................................................................................................................................41
5.4 McBSP Interface......................................................................................................................................42
5.4.1 McBSP Selected for Codec Interface..............................................................................................................42
5.4.2 McBSP Selected for Packet Interface .............................................................................................................43
5.5 Parallel Interface......................................................................................................................................45
5.5.1 Parallel Port Packet Interface........................................................................................................................ 45
5.6 Codec A/D / D/A Interface .......................................................................................................................46
5.7 Vocoder Front End Requirements...........................................................................................................46
5.8 Interfacing a codec to the AMBE-3000™ Vocoder chip..........................................................................49
5.8.1 The Texas Instruments General purpose TLV320AIC14 ................................................................................49
5.8.2 The Texas Instruments PCM3500 General purpose codec.............................................................................50
6 DATA AND CONFIGURATION PACKETS.......................................................................51
6.1 Overview..................................................................................................................................................51
6.2 Codec Mode Operation ...........................................................................................................................51
6.3 Packet Mode Operation...........................................................................................................................51
6.4 Packet Interfaces.....................................................................................................................................52
6.5 Packet Format .........................................................................................................................................52
6.5.1 START_BYTE (1 byte).....................................................................................................................................52
6.5.2 LENGTH (2 bytes) .......................................................................................................................................... 52
6.5.3 TYPE (1 byte)..................................................................................................................................................53
6.5.4 Packet Fields...................................................................................................................................................53
6.5.5 Parity Field (Parity is enabled by default)......................................................................................................54
(Subject to Change) Page vi
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