Cordless telephone

Details Cordless telephone Cordless telephone

1986-08-14

1987-08-25

Lev, Robert

Telephonic communications

Audio message storage, retrieval, or synthesis

379 61, H04Q 704

Patent

active

046898123

ABSTRACT:
A cordless telephone having a fixed unit and a portable unit which are capable of exchanging an identification (ID) signal assigned to the telephone with each other is disclosed. The portable unit includes a receiver circuit which in turn includes a low-frequency section. A cut-off/attenuation circuit, a logic circuit and a timer circuit are built in the low-frequency section of the receiver circuit. The cut-off/attenuation circuit cuts off or attenuates the ID signal when a conversation is under way. The logic circuit controls the cut-off/attenuation circuit while the timer circuit determines a period of time for the ID signal to be cut off or attenuated. The cut-off/attenuation circuit is enabled after the transmission of the ID signal over a predetermined period of time as determined by the timer circuit, thereby cutting off or attenuating the ID signal returned from the fixed unit to the portable unit.

REFERENCES:
patent: 4213009 (1980-07-01), Suzuki
patent: 4508935 (1985-04-01), Mastromoro
patent: 4646345 (1987-02-01), Zouner et al.

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