CT8022 Datasheet, PDF (93/194 Pages) List of Unclassifed Manufacturers – VOIP/VON G.723.1, G279AB TRUESPEECH CO-PROCESSOR

Version: 1.18
PRELIMINARY/CONFIDENTIAL
TrueSpeech® Co-Processor
9.11 Pre-Scaling of DTMF and Call Progress Filter Input
The CT8022 provides a pre-scaler multiplier, which allows independent adjustment to be made to the input signal
level that goes to the tone detection sub-system (DTMF and Call Progress Tone Filters). This pre-scaler (input
volume) control is separate from the record and playback volume controls.
The pre-scaler setting can be read using the following command:
Command = CF05H
Status
= pre-scaler value (default is 0040H)
The pre-scaler setting can be written using the following command:
C1 Command = CF07H
S1 Status = CF07H
C2 Command = new pre-scaler setting
S2 Status = new pre-scaler setting
The default value for the pre-scaler is 0040H, and it acts as a linear scaler. Changing the pre-scaler setting to 0020H
will multiply the signal by 0.5 relative to the normal setting.
CT8022A11AQC FW Revision 0118
DSP GROUP, INC., 3120 SCOTT BOULEVARD
93
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
All specifications are subject to change without prior notice.