Detector for use with an automatic disconnect feature in a telep

Details Detector for use with an automatic disconnect feature in a telep Detector for use with an automatic disconnect feature in a telep

1991-01-07

1993-11-02

Dwyer, James L.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 79, 379 81, 379385, H04M 165

Patent

active

052590224

ABSTRACT:
In a telephone answering machine, a detector for a automatic disconnect function uses a first amplifier to detect, amplify, and invert small input signal changes, and second amplifier to detect large input signal changes and a logic arrangement responsive to the output signals of the first and second amplifiers to detect the presence of only the small input signal changes.

REFERENCES:
patent: 4311879 (1982-01-01), Brush
patent: 4392023 (1983-07-01), Sears
patent: 4523056 (1985-06-01), Fisher
patent: 4759052 (1988-07-01), Hashimoto
Schematic for the GE Model No. 9882 telephone answering machine, manufactured by Thomson Consumer Electronics.

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