On-board ring signal generator

Details On-board ring signal generator On-board ring signal generator

1994-11-15

1997-02-04

Brown, Thomas W.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379377, 379373, 379418, H04M 1902

Patent

active

056007132

ABSTRACT:
A ring generator circuit that produces a ring output for a plurality of telephones simultaneously. The ring generator circuit includes a switch that receives an oscillating signal in response to an on condition of an on/off signal. The on/off signal is related to whether an incoming phone call is directed to one of the plurality of telephones or not. The ring generator circuit also includes a DC offset circuit that receives a DC input potential, an amplifier stage for providing a ring output, and a feedback circuit connected between the ring output of the amplifier stage and the switch output.

REFERENCES:
patent: 3904833 (1975-09-01), Beene et al.
patent: 4110569 (1978-08-01), Schindler et al.
patent: 4581733 (1986-04-01), Sarson et al.
patent: 4675899 (1987-06-01), Ahuja
patent: 5321596 (1994-06-01), Hurst

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