Microphone or mouthpiece signal suppression circuit

Details Microphone or mouthpiece signal suppression circuit Microphone or mouthpiece signal suppression circuit

1983-12-28

1985-08-20

Rubinson, Gene Z.

H04M 158

Patent

active

045366160

ABSTRACT:
The invention relates to a circuit for a telephone set. In order to eliminate the mouthpiece signal between the receiver and the telephone set, there are provided a subtraction means receiving the mouthpiece signal and the composite signal present on the telephone line, one of the two being produced by different compensation impedances, and on the other hand a mixer controlled by a circuit as a function of the telephone line impedance. The two compensation impedances respectively correspond to the compensation of a long line and the compensation of a short line and the output of the mixer supplies a signal mixture, with variable proportions, which effectively suppresses the mouthpiece signal, no matter what the length of the telephone line.

REFERENCES:
patent: 3708630 (1973-01-01), Matsuda et al.
patent: 3745261 (1973-07-01), Friedman

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