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14.4. Ports for Transmitting and Receiving of Data
15. BLOCK DIAGRAM (BASE UNIT)
16. CIRCUIT OPERATION (BASE UNIT)
General Description:
The DSP system is fully controlled by a host processor DSP. The host processor provides
activation and control of all that functions as follows.
16.1. DSP (Digital Speech/Signal Processing: IC201)
- DTMF Detection/Generator
The DTMF detection is implemented by the DSP system in
software. The DTMF detection is performed during Record,
Playback, and Line Monitoring modes of operation.
When the DTMF data from the Handset is received, the DTMF
signal is output.
- Caller ID and Call Waiting CID demodulation
The DSP implements monitor and demodulate the FSK signals
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