TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
In 8-bit playback (all types), the 120 word speech frame is broken up into seven sub-frames of 16 words plus one
sub-frame of 8 words.
Playback Frame Number
Data Transferred
Number Of Sub-Frames
Transferred
120 words of frame 1
(16,16,16,16,16,16,16,8)
+
16 words of frame 2
(16)
104 words of frame 2
(16,16,16,16,16,16,8)
+
16 words of frame 3
(16)
104 words of frame 3
(16,16,16,16,16,16,8)
+
16 words of frame 4
(16)
9 (136 words)
8 (120 words)
8 (120 words)
7 (104 words)
1
2
3
Final Frame
104 words of final frame
(16,16,16,16,16,16,8)
Of particular significance is the sequence of sub-frame sizes transferred by the Host to the CT8022 each 30ms
period. For 8-bit playback, as a result of the playback frame alignment offset, the sequence per frame is:
16,16,16,16,16,16,8,16.
Note: In view of this, it is recommended that Host software performing 8-bit playback should re-check the
status of the TX READY bit at least every 8 words transferred to the CT8022.
80
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 ]
