Circuit for automatically connecting and disconnecting a speaker

Details Circuit for automatically connecting and disconnecting a speaker Circuit for automatically connecting and disconnecting a speaker

1983-09-29

1985-01-29

Rubinson, Gene Z.

179 615, 179 616, H04M 164

Patent

active

044967977

ABSTRACT:
A pair of optical isolator circuits (18, 56) associated with a subscriber's telephone line are utilized to automatically connect and disconnect a speakerphone to the telephone line. Receipt of each calling ringing signal operates the first optical isolator (18) and a first one shot multivibrator (28) to generate and apply counting pulses to a counter (37). Upon receipt of a predetermined count, the counter acts to energize a relay (51) to connect the speakerphone and the second monitoring optical isolator to the telephone line. Upon either party going "on hook" at the completion of the call, the second monitoring optical isolator (56) is interrupted which results in the operation of a second one shot multivibrator to generate a pulse to reset the counter whereupon the relay is released to disconnect the speakerphone and the second monitoring optical isolator from the telephone line.

REFERENCES:
patent: 3041411 (1962-06-01), Beatty
patent: 4049916 (1977-09-01), Danner

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