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KX-PRW130W/KX-PRWA13W
4.4.
Circuit Operation (Base Unit)
General Description:
(BBIC, Flash Memory, EERROM) is a digital speech/signal processing system that implements all the functions of speechcom-
pression, record and playback, and memory management required in a digital telephone answering machine.The BBIC system
is fully controlled by a host processor. The host processor provides activation and control of all that functionsas follows.
RF part
EEPROM IC502
4.4.1.
BBIC (Base Band IC: IC501)
• Voice Message Recording/Play back
The BBIC 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 BBIC implements synthesized Voice, utilizing the built in speech detector and a Flash Memory, which stored the vocabulary.
• Caller ID demodulation
The BBIC 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 theTele-
phone line, etc. They are determined by the signal path route operation of voice signal.
• Block Interface Circuit
RF part, Key scan, Telephone line.
4.4.2.
Flash Memory (IC611)
Following information data is stored.
• Voice signal
ex: Pre-recorded Greeting message, Incoming message
4.4.3.
EEPROM (IC502)
Following information data is stored.
• Settings
ex: message numbers, ID code, Flash Time, Tone/Pulse
DECT RF system
ADPCM
TDMA/TDD
Mod/Demod
ADPCM
PA/LNA
Host CPU
BBIC (IC501)
Keys/ Charge
Digital
Speech
Processor
Caller ID
Modem
Digital TAM System
Flash Memory IC611
12
TEL
Analog
Line
Front
Interface
End
&
Multi-
plexer
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Troubleshooting
