Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1986-09-18
1987-09-01
Lev, Robert
Telephonic communications
Audio message storage, retrieval, or synthesis
379110, H04Q 704
Patent
active
046913386
ABSTRACT:
A line switching circuit for a communications system which includes a cordless telephone and gives priority of use to an ordinary telephone associated with the cordless one is disclosed. The circuit includes a current detector for detecting a current which flows through the telephone, a circuit having a time constant on only one of positive going edges and negative going edges of an output of the current detector, a relay interposed between the cordless telephone and a subscriber's telephone line, and a driver for driving the relay. The relay is closed immediately upon change of the telephone from an off-hook state to an on-hook state and opened with a predetermined time constant upon change of the same from an on-hook state to an off-hook state, whereby a hand-over of conversation between the telephones may be effected without any malfunction even if a ringing signal from a central office is received.
REFERENCES:
patent: 4082919 (1978-04-01), Day et al.
patent: 4400584 (1983-08-01), Vilmur
patent: 4430755 (1984-02-01), Nadir
patent: 4542262 (1985-09-01), Ruff
patent: 4578540 (1986-03-01), Borg et al.
patent: 4591661 (1986-05-01), Benedetto et al.
patent: 4640987 (1987-02-01), Tsukada
patent: 4640988 (1987-02-01), Rorinton
Lev Robert
NEC Corporation
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