Multi-stage noise-reducing system

Details Multi-stage noise-reducing system Multi-stage noise-reducing system

1989-03-20

1990-10-23

Isen, Forester W.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

H04B 1500

Patent

active

049658344

ABSTRACT:
An electronic noise-reducing system which includes a plurality of adaptive filters forming multiple stages of noise reduction and producing greatly increased signal-to-noise ratio. The input for the primary channel of the first adaptive filter, which forms the first noise-reducing stage, is the signal including multitones buried in noise. The reference channel ideally uses signal-free noise as input. The output of the first adaptive filter is used as the input to the primary channel of the second or final adaptive filter, whereas the reference channel thereof is fed with "clean noise". The clean noise can be obtained as the output of the intermediate adaptive filter by feeding simultaneously both the primary and reference channels of the intermediate filter with the noise-reduced waveform present at the output of the first noise-reducing filter.

REFERENCES:
patent: 4589137 (1986-05-01), Miller
patent: 4649505 (1987-03-01), Zinser, Jr. et al.
Heinone, et al., FIR-Median Hybrid Filters, IEEE Transactions on Acoustics, peech, and Signal Processing, vol. ASSP-35, No. 6, Jun., 1987.

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