Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent
1985-05-06
1987-09-01
Rubinson, Gene Z.
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
379388, H04M 908
Patent
active
046913483
ABSTRACT:
A two way telephone communication system includes a station having a signal transmitting channel for conveying a signal received at a microphone to another station, a signal receiving channel for conveying signals received from the other station to a speaker, and switches permitting the two signal channels to be selectively enabled or disabled. Two signal detection paths are associated with the transmitting and receiving channels, each containing circuitry which detects the presence of signals in one of the channels and responds by generating actuating signals. Control circuitry responds to the detection path which first generates an actuating signal by enabling its associated signal channel and simultaneously disabling the other signal channel, triggering the switches appropriately. Delay circuitry associated with each signal detection path can be selectively enabled to delay the generation of an actuating signal in the associated signal detection path. The delay circuitry of the signal detection path associated with the disabled signal channel is enabled so long as signals are present in the enabled signal channel. This arrangement tends to maintain the enabled signal channel until it is no longer required to convey signals.
REFERENCES:
patent: 3751602 (1973-08-01), Breeden
patent: 3925618 (1975-12-01), Kato et al.
patent: 3952166 (1976-04-01), Kato et al.
patent: 3970786 (1976-07-01), Randmere
patent: 4052562 (1977-10-01), Andersen
patent: 4490582 (1984-12-01), Munson
patent: 4542263 (1985-09-01), Mitani
NovAtel Communications Ltd.
Rubinson Gene Z.
Vaas R.
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