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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.
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
RF part
ADPCM
Analog
Front
End
&
Multi-
plexer
TEL
Line
Interface
Digital
Speech
Processor
Caller ID
Modem
Digital TAM System
Flash Memory IC611
Host CPU
BBIC (IC501)
DECT RF system
TDMA/TDD
Mod/Demod
PA/LNA
ADPCM
Keys/ Charge
EEPROM IC502