Panasonic KX-TG9341T Service Manual - Page 11

Circuit Operation Base Unit - call block code

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4.4. Circuit Operation (Base Unit) KX-TG9341T/KX-TG9342T/KX-TG9343S/KX-TG9343T/KX-TG9344T/KX-TGA931S/KX-TGA931T General Description: (DSP, Flash Memory) is a digital 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 DSP. The host processor provides activation and control of all that functions as follows. 4.4.1. DSP (Digital Speech/Signal Processing: IC501) • Voice Message Recording/Play back The DSP system uses a proprietary speech compression technique to record and store voice message in Flash Memory. An error correction algorithm is used to enable playback of these messages from the Flash Memory. • DTMF Generator When the DTMF data from the handset is received, the DTMF signal is output. • Synthesized Voice (Pre-recorded message) The DSP implements synthesized Voice, utilizing the built in speech detector and a Flash Memory, which stored the vocabulary. • Caller ID demodulation The DSP implements monitor and demodulate the FSK/DTMF signals that provide CID information from the Central Office. • Digital Switching The voice signal from telephone line is transmitted to the handset or the voice signal from the handset is transmitted to the Telephone line, etc. They are determined by the signal path route operation of voice signal. • Block Interface Circuit RF part, LED, Key scan, Speaker, Microphone, Telephone line. 4.4.2. Flash Memory (IC601) Following information data is stored. • Voice signal ex: Pre-recorded Greeting message, Incoming message • Settings ex: message numbers, ID code, Flash Time, Tone/Pulse 11

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KX-TG9341T/KX-TG9342T/KX-TG9343S/KX-TG9343T/KX-TG9344T/KX-TGA931S/KX-TGA931T
4.4.
Circuit Operation (Base Unit)
General Description:
(DSP, Flash Memory) is a digital 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 DSP. The host processor provides activation and control of all that func-
tions as follows.
4.4.1.
DSP (Digital Speech/Signal Processing: IC501)
•
Voice Message Recording/Play back
The DSP system uses a proprietary speech compression technique to record and store voice message in Flash Memory.
An error correction algorithm is used to enable playback of these messages from the Flash Memory.
•
DTMF Generator
When the DTMF data from the handset is received, the DTMF signal is output.
•
Synthesized Voice (Pre-recorded message)
The DSP implements synthesized Voice, utilizing the built in speech detector and a Flash Memory, which stored the vocabulary.
•
Caller ID demodulation
The DSP implements monitor and demodulate the FSK/DTMF signals that provide CID information from the Central Office.
•
Digital Switching
The voice signal from telephone line is transmitted to the handset or the voice signal from the handset is transmitted to the Tele-
phone line, etc. They are determined by the signal path route operation of voice signal.
•
Block Interface Circuit
RF part, LED, Key scan, Speaker, Microphone, Telephone line.
4.4.2.
Flash Memory (IC601)
Following information data is stored.
•
Voice signal
ex: Pre-recorded Greeting message, Incoming message
•
Settings
ex: message numbers, ID code, Flash Time, Tone/Pulse