Telephone capable of selectively accepting callers and enabling

Details Telephone capable of selectively accepting callers and enabling Telephone capable of selectively accepting callers and enabling

1990-11-27

1993-07-13

Dwyer, James L.

Telephonic communications

Audio message storage, retrieval, or synthesis

379200, 379386, 379387, 379424, 379199, H04M 151, H04M 164

Patent

active

052280756

ABSTRACT:
A telephone set capable of selectively accepting callers and enabling partial recognitions of callers is disclosed, and the telephone set includes: tip and ring terminals; a first analogue switch connected to said tip terminal; a first bridge diode connected to the first analogue switch and the ring terminal; a wave rectifying circuit connected to the first bridge diode; a microprocessor connected to the wave rectifying circuit and the first analogue switch; an EEPROM connected to the microprocessor; a hook switch connected to the microprocessor; a selecting switch connected to the microprocessor; a second bridge diode connected to the tip and ring terminals; a hybrid IC circuit connected to the second bridge diode; a DTMF decoder connected to the hybrid IC circuit and the microprocessor; a power supply means for supplying the required power to the internal circuits; and a second analogue switch and a microphone.

REFERENCES:
patent: 4266098 (1981-05-01), Novak
patent: 4791664 (1988-12-01), Lutz et al.
patent: 4802202 (1989-01-01), Takahashi et al.
patent: 4817133 (1989-03-01), Takahashi et al.
patent: 4924496 (1990-05-01), Figa et al.

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