Patent
1979-01-05
1980-11-25
Tupper, Robert S.
H04M 158
Patent
active
042360480
ABSTRACT:
An electronic device comprises separate channels for receiving input signals representative of an undesired signal and a composite signal, envelope detectors for detecting amplitude envelopes of signals representative of the input signals, and an electronic subtractor for determining the electronic difference between the envelope signals to produce an output signal indicative of a desired signal. The device is employed particularly for cancelling the effect of the telephone sidetone signal in a telephone to yield an output signal indicative of the telephone maintone signal.
REFERENCES:
patent: 3908094 (1975-09-01), Deluegue
Fairchild Camera & Instrument Corporation
Meetin Ronald J.
Pollock Michael J.
Popek Joseph A.
Tupper Robert S.
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