Circuit Operation (Base Unit); Bbic (Base Band Ic: Ic501); Flash Memory (Ic502); Flash Memory (Ic601) - Panasonic KX-PRL260B Service Manual

4.5.

Circuit Operation (Base Unit)

General Description:
(BBIC, Flash Memory, EERROM) 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 BBIC system is fully controlled by a host processor. The host processor provides activation and control of all that functions
as follows.
Bluetooth Unit
RF part
EEPROM
IC611
4.5.1.

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 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, Telephone line.
4.5.2.

Flash Memory (IC502)

Main program data is stored.
4.5.3.

Flash Memory (IC601)

Following information data is stored.
• Voice signal
ex: Pre-recorded Greeting message, Incoming message
4.5.4.

EEPROM (IC611)

Following information data is stored.
• Settings
ex: message numbers, ID code, Flash Time, Tone/Pulse
4.5.5.

Bluetooth Unit (IC721)

Use for Bluetooth communication.
PCM OUT
PCM IN
ADPCM
TDD & TDMA
with FHSS
Processor
ADPCM
Host CPU
BBIC (IC501)
Digital TAM System
Flash Memory
Keys/ LEDs
(Program)
/ Charge
IC502
Digital
Speech
Analog
Processor
Front
End
&
Caller ID
Multi-
Modem
plexer
Flash Memory IC601
13
KX-PRL260/KX-PRL262/KX-PRD260/KX-PRD262/KX-PRLA20
TEL
Line
Interface
MIC
IC402 IC401
Dock SP