Voice Message Recording - Panasonic KX-TG2583B Service Manual

13.10. DSP (Digital Speech/Signal Processing) Circuit
General Description:
(IC501, IC571) 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 IC501. 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 FLASH MEMORY (IC571), which is used for stored voice messages and synthesized voice.

- Voice Message Recording

The DSP system use a proprietary speech compression technique
to record and store voice message in FLASH MEMORY (IC571).
An error correction algorithm is used to enable playback of these
messages from the FLASH MEMORY (IC571).
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