CT8022 Datasheet, PDF (8/194 Pages) List of Unclassifed Manufacturers – VOIP/VON G.723.1, G279AB TRUESPEECH CO-PROCESSOR

TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
11 CT8022 CODEC INTERFACE TIMING AND AC SPECIFICATION .................................................... 169
11.1 SHORT FRAME SYNC.................................................................................................................................. 169
11.2 LONG FRAME SYNC ................................................................................................................................... 170
12 ELECTRICAL CHARACTERISTICS......................................................................................................... 172
13 MECHANICAL DATA - CT8022 ................................................................................................................. 175
13.1 PQFP PACKAGE 14X20MM........................................................................................................................ 175
14 CT8020/1 MIGRATION TO CT8022 ........................................................................................................... 176
15 CT8022 EVB SCHEMATIC .......................................................................................................................... 177
15.1 CT8022 EVB ............................................................................................................................................ 177
15.2 CT8022 EVB CODECS ............................................................................................................................ 178
Appendices
A SPEAKERPHONE THEORY OF OPERATION ........................................................................................ 179
A.1 INTRODUCTION .......................................................................................................................................... 180
A.2 ANALOG CIRCUITRY................................................................................................................................... 180
A.3 ACOUSTIC SYSTEM .................................................................................................................................... 180
A.4 CT8022 DIGITAL CANCELLER.................................................................................................................... 181
A.4.1 Half-Duplex Mode ............................................................................................................................ 181
A.4.2 Full-Duplex Mode ............................................................................................................................. 181
A.5 VOLUME CONTROL .................................................................................................................................... 182
A.6 DIAL TONE DETECTION.............................................................................................................................. 182
A.7 PERFORMANCE........................................................................................................................................... 182
A.8 CONTROL ALGORITHM EXAMPLE............................................................................................................... 183
B AEC PERFORMANCE IN DSVD APPLICATIONS.................................................................................. 184
C WAVE FILE FORMAT (.WAV)................................................................................................................... 185
D CT8022 EVALUATION BOARD.................................................................................................................. 187
D.1 CT8022 EVB CONNECTOR PIN OUT ......................................................................................................... 188
E G.723.1 FRAME STRUCTURE .................................................................................................................... 189
E.1 G.723.1 VERSION HISTORY ....................................................................................................................... 191
E.2 G.723.1 CONTROL BITS ............................................................................................................................. 192
F ORDERING INFORMATION ...................................................................................................................... 193
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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.