User`s manual

AMBE-2000™ Vocoder Chip
User’s Manual Version 4.9
DVSI Confidential Proprietary, Subject to Change Page 5
Visit us at www.dvsinc.com
5.2.7 Framed Input: Word 9 : Unused in Input 29
5.2.8 Framed Input: Word 10 : DTMF Control 30
5.2.9 Framed Input: Word 11 : Control Word 2 31
5.2.10 Framed Input: Words 12-23 : Channel Data 31
5.3 Framed Output 32
5.3.1 Framed Output: Word 0 : Header 32
5.3.2 Framed Output: Word 1 : Power Control ID 32
5.3.3 Framed Output: Word 1 : Control Word 1 32
5.3.4 Framed Output: Words 2-6 : Rate Information 33
5.3.5 Framed Output: Word 7 : Bit Error Rate 33
5.3.6 Framed Output: Word 8 : Soft Decision Distance 33
5.3.7 Framed Output: Word 9 : Detected Bit Errors 33
5.3.8 Framed Output: Word 10 : DTMF Control 34
5.3.9 Framed Output: Word 11 : Control Word 2 35
5.3.10 Framed Output: Words 12-23 : Channel Data 36
5.4 Unframed Serial Format 36
5.4.1 Unframed Serial Output Format 36
5.4.2 Unframed Serial Input Format 36
6 A/D-D-A Interface 38
6.1 A/D-D/A Overview 38
6.2 Configuring the A/D-D/A Interface using CODEC_SEL [1-0] 38
6.3 Low Level A/D–D/A Timing 39
7 Special Functions 41
7.1 Hardware vs. Software Selection Note 41
7.2 Coding Rate Selection 41
7.3 Echo Cancellation 42
7.4 Voice Activation Detection (VAD), Comfort Noise Insertion (CNI) 43
7.5 Dual Tone Multiple Frequency, Detection and Generation 43
7.6 Normal Power and Power Saving Modes 43
7.6.1 Standard Sleep Mode 43
7.6.2 Power Down 44
7.7 Slip Enable 45
8 Appendices 49
8.1 Example A/D-D/A 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 57
8.5 Expanded Tone Detection and Generation 60
8.6 Soft Decision Decoding 60
8.7 Special Rate 2350 bps Voice / 50 bps FEC AMBE-1000™ Vocoder Chip Compatible Mode 63