Microphone expansion for background noise reduction

Details Microphone expansion for background noise reduction Microphone expansion for background noise reduction

1996-01-16

1998-01-13

Kuntz, Curtis

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381104, 381106, 381107, 381 57, 395 234, 395 235, 395 237, 455 501, H04B 1500

Patent

active

057087229

ABSTRACT:
Disclosed is an apparatus for reducing background noise in a telecommunications device, the telecommunications device including a microphone for receiving acoustic sights and generating corresponding electrical signals therefrom, the acoustic signals including voice signals and background noise signals. The apparatus of the present invention in one embodiment include an amplifier having an input for receiving the electrical signals from the microphone and an output, said amplifier operable to receive electrical signals at the first input and provide amplification to the electrical signals to produce amplified electrical signals. The amplifier is further operable to provide amplification at a first gain level and a second gain level, said first gain level exceeding the second gain level. The apparatus also includes a feedback device connected to the output of the amplifier and further operably connected to control the operation of the amplifier. The feedback device is operable to cause the amplifier to provide amplification at the first gain level when the feedback device receives amplified electrical signals at the output having an amplitude above a predetermined threshold and cause the amplifier to provide amplification at the second gain level when the feedback device receives amplified electrical signals at the output having an amplitude below the predetermined threshold.

REFERENCES:
patent: 3691311 (1972-09-01), Wilson
patent: 4630304 (1986-12-01), Borth et al.
patent: 4630305 (1986-12-01), Borth et al.
patent: 4677389 (1987-06-01), Op de Beek et al.
patent: 5235637 (1993-08-01), Kraz et al.
AT&T Microelectronics data book, pp. 9-73 through 9-79.

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