Panasonic KX-TG6381LBB Service Manual

11KX-TG6381LBB/KX-TG6381LBS/KX-TG6382LBB/KX-TGA632LBB/KX-TGA632LBS4.4. Circuit Operation (Base Unit)General Description:(DSP, EEPROM) is a digital speech/signal processing system that implements all the functions of speech compression andmemory management required in a digital telephone.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)• DTMF GeneratorThe DTMF detection is implemented by the DSP system in software.The DTMF detection is performed during Line Monitoring modes of operation.When the DTMF data from the handset is received, the DTMF signal is output.• Caller ID demodulationThe DSP implements monitor and demodulate the FSK/DTMF signals that provide CID information from the Central Office.• Digital SwitchingThe 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 CircuitRF part, LED, Key scan, Telephone line.4.4.2. EEPROM (IC611)Following information data is stored.• Settingsex: ID code, Flash Time, Tone/Pulse