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
ANALOG CIRCUITRY................................................................................................................................... 180
ACOUSTIC SYSTEM .................................................................................................................................... 180
CT8022 DIGITAL CANCELLER.................................................................................................................... 181
A.2
A.3
A.4
A.4.1
A.4.2
A.5
A.6
A.7
A.8
Half-Duplex Mode ............................................................................................................................ 181
Full-Duplex Mode............................................................................................................................. 181
VOLUME CONTROL .................................................................................................................................... 182
DIAL TONE DETECTION.............................................................................................................................. 182
PERFORMANCE........................................................................................................................................... 182
CONTROL ALGORITHM EXAMPLE............................................................................................................... 183
B
C
D
AEC PERFORMANCE IN DSVD APPLICATIONS.................................................................................. 184
WAVE FILE FORMAT (.WAV)................................................................................................................... 185
CT8022 EVALUATION BOARD.................................................................................................................. 187
D.1
CT8022 EVB CONNECTOR PIN OUT ......................................................................................................... 188
E
F
G.723.1 FRAME STRUCTURE .................................................................................................................... 189
E.1
E.2
G.723.1 VERSION HISTORY ....................................................................................................................... 191
G.723.1 CONTROL BITS ............................................................................................................................. 192
ORDERING INFORMATION...................................................................................................................... 193
8
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 ]
