System for processing an audio signal so as to reduce the noise

Details System for processing an audio signal so as to reduce the noise System for processing an audio signal so as to reduce the noise

1993-11-19

1996-01-16

Brinich, Stephen

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381 46, H04B 1500

Patent

active

054855241

ABSTRACT:
The invention relates to a system for processing an audio signal to reduce the noise contained therein, the system comprising a source (1) of an audio signal in electric form, a first filter group (2) for dividing the audio signal into several subband signals in different frequency bands, a detector (3) for each subband signal to detect the audio signal level thereof, and a compressor/expander (4) for compressing/expanding each subband signal on the basis of the detected audio signal level thereof, and a second filter group (5) for combining the compressed/expanded subband signals to generate a reconstructed audio signal (6). According to the invention the first filter group (2,5) is arranged to divide the sound frequency range into bands with a width enabling the processing of the signal within the critical bands, and each compressor/expander (4) is arranged to attenuate the signal in its band when the detector (3) associated therewith has detected that the audio signal is missing from said frequency band.

REFERENCES:
patent: 3803357 (1974-04-01), Sacks
patent: 4882762 (1989-11-01), Waldhauer
patent: 4896362 (1990-01-01), Veldhuis et al.
patent: 5067157 (1991-11-01), Ishida et al.
patent: 5105463 (1993-04-01), Veldhuis et al.
patent: 5321758 (1994-06-01), Charpentier et al.
patent: 5337367 (1994-08-01), Maeda

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