Ambient noise suppression circuit

Details Ambient noise suppression circuit Ambient noise suppression circuit

1994-04-18

1998-05-12

Lee, Thomas D.

Electrical audio signal processing systems and devices

Noise or distortion suppression

381 711, 381 945, H04R 100, H03G 500, H03G 900, H03G 300

Patent

active

057518220

ABSTRACT:
An ambient noise suppression electrical circuit to be used with a voice communication terminal comprising a gain control amplifier, whose input is a microphone, and a peak-hold circuit that includes a band-pass amplifier that amplifies a specified frequency range of the output signals of the microphone, a peak detection circuit that produces signals in proportion to the peak level of the output signals of the band-pass amplifier, and a holding circuit that controls reduction of output signals of the peak detection circuit for a specified period of time. The output signal from the peak-hold circuit controls the gain of the gain control amplifier. When a microphone is located far from a mouth and is used under high ambient noise, the present invention makes it possible for the microphone to perform as if it is a microphone which is located in a quality telephone handset that cuts off ambient noise.

REFERENCES:
patent: 4112384 (1978-09-01), Buchberger
patent: 4506381 (1985-03-01), Ono
patent: 4771472 (1988-09-01), Williams, III et al.
patent: 5036540 (1991-07-01), Eastmond
patent: 5212551 (1993-05-01), Conanan
patent: 5235637 (1993-08-01), Kraz et al.
patent: 5371803 (1994-12-01), Williamson, III
patent: 5461223 (1995-10-01), Butturini
Exhibit A.

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