Read Panasonic KX-TG2560B / KX-TG2560S Service Manual online
45
KX-TG2560B/KX-TG2560S
12. DSP (Digital Speech/Signal Processing) Circuit
General Description:
(IC701~IC702) is a digital speakerphone/speech/signal processing system that implements all the functions of speech
compression, record and playback, and memory management required in a digital telephone answering machine.
The DSP system is fully controlled by a host processor IC701. The host processor provides activation and control of all that
functions, such as speech Recording, Playback, Tone detecting and Line monitoring.
The DSP system comprises of following.
— a Host Processor.
— a Digital Signal Processor which includes the firmware implemented functions.
— a EPROM (IC703), which is used for stored voice messages and synthesized voice.
Circuit Diagram
DSP
(IC701)
Analog
I/O
EPROM
(IC703)
Audio In
Audio Out
Audio Out
• 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.
• Caller ID and Call Waiting CID demodulation
The DSP implements monitor and demodulate the FSK signals that provide CID information from the Central Office.
Click on the first or last page to see other KX-TG2560B / KX-TG2560S service manuals if exist.