Version: 1.18
PRELIMINARY/CONFIDENTIAL
TrueSpeech® Co-Processor
9.7.9
Programming the Record Peak Threshold
The PEAK bit in the Record mode status S2 response can be used by the Host to implement silence detection during
record. The PEAK bit is set whenever the average signal level for the most recent record frame is greater than the
Input Peak Threshold. Although the CT8022 includes a record data frame buffer which can hold a number of record
data frames, the PEAK indication provided always refers to the most recent frame recorded. In most cases, where
the Host services the CT8022 record data frame buffer every frame period (30ms), there should never be more than
one data frame in the buffer. The signal level measured is the input signal level before any scaling occurs due to the
Record Volume Control or AGC.
Command C1 (CF99H):
1100 1111 1001 1
(15-3)
001
(2-0)
Status S1:
1100 1111 1001 1
(15-3)
001
(2-0)
Command C2:
Status S2:
Threshold Value
(15-0)
Threshold Value
(15-0)
The default Threshold Value is 0100H.
CT8022A11AQC FW Revision 0118 DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
67
All specifications are subject to change without prior notice.
ETC [ ETC ]
