TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
To set the base frame size use the following command:
Command
Status
07XXH
07XXH or 0000H
Where XX selects the desired frame size (for example 07F0H selects a base frame size of 240 (decimal) for 30ms
operation, 0750H selects a base frame size of 80 (decimal) for 10ms operation)
Note that the base frame size can only be changed when the CT8022 is in the Idle state and the AEC is in the Off
state. The Host must ensure that the base frame size selected matches the requirements of the speech compression
algorithms that the Host activates. If the command to set the base frame size is completed successfully, the status
response is 07XXH, echoing the command sent. If an attempt is made to change the base frame size when the
CT8022 is not in the Idle state, the status response will be 0000H and the actual base frame size in the device is not
changed.
For the uncompressed modes (G.711 µ-law/A-law, and 8-bit and 16-bit linear) any frame size may be used.
Changing the frames size also causes corresponding changes in the size of the data block transferred to the Host:
Uncompressed Data Type
Frame Size Selected
Size Of Data Transfer Block
(16-Bit Words)
16-bit linear
16-bit linear
16-bit linear
240 (30ms XX=F0)
160 (20ms XX=A0)
80 (10ms XX=50)
240 (30ms XX=F0)
160 (20ms XX=A0)
80 (10ms XX=50)
240
160
80
120
80
8-bit linear/µ-law/A-law
8-bit linear/µ-law/A-law
8-bit linear/µ-law/A-law
40
56
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 ]
