Audio peripheral mixer circuit and method for noise reduction

Details Audio peripheral mixer circuit and method for noise reduction Audio peripheral mixer circuit and method for noise reduction

1993-05-13

1995-08-08

Kuntz, Curtis

Electrical audio signal processing systems and devices

With mixer

381 94, 381106, H04B 100, H04B 1500, H03G 700

Patent

active

054406439

ABSTRACT:
A circuit and method for mixing signals from audio sources provide noise reduction by employing a noise gate to selectively attenuate one of the source signals. The noise gate has a low gain state and a unity gain state. The noise gate switches to its unity gain state when a control signal reaches a predefined threshold voltage. The control signal is generated by rectifying and integrating the noisy source audio signal, so that the noise gate enters the unity gain state only when a useful sound occurs. Thus, the noise in the combined audio signal is reduced, without attenuating useful components of the source signals.

REFERENCES:
patent: 3992584 (1976-11-01), Dugan
patent: 4357492 (1982-11-01), Campbell et al.
patent: 4374300 (1983-02-01), Ponto et al.

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