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
Status
= CF05H
= 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
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
93
All specifications are subject to change without prior notice.
ETC [ ETC ]
