AMBE-2000™ Vocoder Chip Users Manual
Version 4.92, June, 08
DVSI Confidential Proprietary, Subject to Change
Page 6
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5.2.6
Framed Input: Word 8 : Unused in Input
31
5.2.7
Framed Input: Word 9 : Unused in Input
31
5.2.8
Framed Input: Word 10 : DTMF Control
32
5.2.9
Framed Input: Word 11 : Control Word 2
32
5.2.10
Framed Input: Words 12-23 : Channel Data
33
5.3
Framed Output Format
33
5.3.1
Framed Output: Word 0 : Header
34
5.3.2
Framed Output: Word 1 : Power Control ID
34
5.3.3
Framed Output: Word 1 : Control Word 1
34
5.3.4
Framed Output: Words 2-6 : Rate Information
35
5.3.5
Framed Output: Word 7 : Bit Error Rate
35
5.3.6
Framed Output: Word 8 : Soft Decision Distance
35
5.3.7
Framed Output: Word 9 : Detected Bit Errors
35
5.3.8
Framed Output: Word 10 : DTMF Control
35
5.3.9
Framed Output: Word 11: Control Word 2
37
5.3.10
Framed Output: Words 12-23 : Channel Data
38
5.4
Unframed Serial Format
38
5.4.1
Unframed Serial Output Format
38
5.4.2
Unframed Serial Input Format
39
6
A/D-D-A Interface
40
6.1
A/D-D/A Overview
40
6.2
Configuring the A/D-D/A Interface using CODEC_SEL[1-0]
40
6.3
Low Level A/D–D/A Timing
41
7
Special Functions
43
7.1
Hardware vs. Software Selection Note
43
7.2
Coding Rate Selection
43
7.3
Voice Activity Detection (VAD), Comfort Noise Insertion (CNI)
44
7.4
Dual Tone Multiple Frequency, Detection and Generation
45
7.5
Normal Power and Power Saving Modes
45
7.5.1
Standard Sleep Mode
45
7.5.2
Power Down
45
7.6
Slip Enable
46
8
Appendices
49
8.1
Example: AD73311 Usage
49
8.2
Example: Texas Instruments TLV320AIC10 Usage
50
8.3
Configuring the AD73311 for 3-Volt Operation
54
8.4
Interfacing to the Texas Instruments PCM3500 Codec
56
8.5
Expanded Tone Detection and Generation
59
8.6
Soft Decision Decoding
60
8.7
Special Rate 2350 bps Voice / 50 bps FEC AMBE-1000™ Vocoder Chip Compatible Mode 62
