- DTMF Detection
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.
- Synthesized Voice
The DSP implements synthesized Voice, utilizing the built in
speech detector and an FLASH MEMORY (IC571), which stored the
vocabulary.
- Caller ID and Call Waiting CID demodulation
The DSP implements monitor and demodulate the FSK signals that
provide CID information from the Central Office.
- Transmit and Receive ADPCM Data
This DSP implement ADPCM.
13.11. Greeting Recording Circuit
Circuit Operation:
MIC C474 C475 C476 R476 pin 47 of IC501.
When Pin82 of IC501 is “Low“ Greeting recording.
13.12. Greeting Play Back Circuit
Circuit Operation:
pin36 of IC501 R431 C432 C433 Telephone Line.
68
To Next Page
Loading...
