TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
9.8.1
9.8.2
9.8.3
9.8.4
9.8.5
9.8.6
9.8.7
9.8.8
9.8.9
Transfer Mode..................................................................................................................................... 70
Playback Modes .................................................................................................................................. 72
Playback Protocol................................................................................................................................ 73
Playback Frame Alignment Using Transmit Data Buffer.................................................................... 79
Select TrueSpeech Playback Rate ....................................................................................................... 81
Inserting Silence During Compressed Speech Playback ..................................................................... 82
Activating The G.723.1 Frame Erasure Mechanism ........................................................................... 82
G.723.1 Comfort Noise Generation (CNG)......................................................................................... 82
Reading the Playback Signal Level Value........................................................................................... 83
STOP RECORD/PLAYBACK............................................................................................................................ 84
9.9
9.10 PLAYBACK & RECORD VOLUME CONTROL.................................................................................................. 85
9.10.1 Read Record/Playback Volume Control Command ............................................................................ 85
9.10.2 Set Record/Playback Volume Control................................................................................................. 86
9.10.3 Automatic Gain/Level Control (AGC or ALC)................................................................................... 88
9.11 PRE-SCALING OF DTMF AND CALL PROGRESS FILTER INPUT...................................................................... 93
9.12 HOST SYNC MODES ..................................................................................................................................... 94
9.13 PLAYBACK & RECORD BUFFER CONTROL ................................................................................................... 95
9.13.1 Monitoring Buffer Depth..................................................................................................................... 95
9.13.2 Speech Frame Create........................................................................................................................... 95
9.13.3 Speech Frame Delete........................................................................................................................... 96
9.13.4 Playback & Record Buffer Freeze (Pause).......................................................................................... 96
9.13.5 Buffer Depth Limit.............................................................................................................................. 97
9.13.6 Playback Auto-Repeat......................................................................................................................... 98
9.14 FULL-DUPLEX SPEECH MODE ...................................................................................................................... 99
9.15 ACOUSTIC ECHO CANCELLER IN DSVD MODE ......................................................................................... 100
9.15.1 Concurrent AEC and Speech Operation............................................................................................ 101
9.15.2 AEC Tail Length............................................................................................................................... 102
9.15.3 Controlling the AEC Adaptation (Training) Rate.............................................................................. 103
9.15.4 Adding Additional Echo Suppression ............................................................................................... 105
9.15.5 Activating the Advanced Echo Canceller Features in the CT8022.................................................... 107
9.15.6 AEC Train-and-Lock......................................................................................................................... 112
9.15.7 Controlling the Automatic Loop Adjustment Attenuation................................................................. 115
9.15.8 Setting AEC Microphone Noise Cut-Off Level When Canceling Telephone Line Echoes............... 116
9.15.9 Reading the Instantaneous AEC Attenuation .................................................................................... 117
9.15.10 Saving and Restoring the AEC and EEC Coefficients ...................................................................... 117
9.15.11 Evaluating Echo Canceller Performance........................................................................................... 118
9.16 SPEECH FRAME INTERRUPT ....................................................................................................................... 118
9.16.1 Frame Interrupt via the FR Pin.......................................................................................................... 118
9.16.2 Frame Interrupt via Aux Software Status Register ............................................................................ 120
9.17 DEVICE SELF-TEST .................................................................................................................................... 120
9.17.1 Check Internal Program ROM Integrity............................................................................................ 120
9.17.2 Test External Data SRAM................................................................................................................. 121
9.17.3 External Data SRAM Configuration ................................................................................................. 121
9.18 DEVICE IDENTIFICATION ............................................................................................................................ 122
9.18.1 Get Device Identification Code......................................................................................................... 122
9.18.2 Get Device Version (Revision) Code................................................................................................ 122
9.19 TONE GENERATION IN IDLE PLAYBACK & RECORD MODES ...................................................................... 123
9.19.1 Stop Tone Generation ....................................................................................................................... 123
9.19.2 Synchronous Mode............................................................................................................................ 124
9.19.3 Asynchronous Mode.......................................................................................................................... 125
9.19.4 Tone Generation in Asynchronous Mode.......................................................................................... 126
9.19.5 Tone Level Table .............................................................................................................................. 126
9.19.6 New Tone Initialization..................................................................................................................... 127
9.19.7 Default (Power-On) Tone Table Contents......................................................................................... 129
9.20 CT8022 LINE MONITOR COMMANDS......................................................................................................... 130
6
DSP GROUP, INC., 3120 SCOTT BOULEVARD CT8022A11AQC FW Revision 0118
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
All specifications are subject to change without prior notice.
ETC [ ETC ]
