Noise canceling system

Details Noise canceling system Noise canceling system

1986-12-08

1988-02-02

Isen, Forester W.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

H04B 1500

Patent

active

047232943

ABSTRACT:
Under the condition where a plurality of background noise sources exists, there are arranged a first receiver, primarily receiving desired voice, and a plurality of second receivers each primarily receiving noise from a corresponding noise source. Filter coefficients of equivalent noise-producing filters, each having a frequency transmission characteristic equivalent to that of transmission path from its corresponding noise source to the first receiver, are estimated based upon mutual-correlation coefficients among the outputs of the first and second receivers and auto-correlation coefficients of the respective outputs of the second receivers. The noise signals from the equivalent noise-producing filters are subtracted from the output of the first receiver, thereby canceling the background noise. The filter coefficients estimation may be performed by using a maximum of the mutual-correlation coefficients between the outputs of the first receiver and the respective second receivers.

REFERENCES:
patent: 4008439 (1977-02-01), Schroeder
patent: 4536887 (1985-08-01), Kaneda et al.
patent: 4630304 (1986-12-01), Borth et al.
patent: 4658426 (1987-04-01), Chabries et al.

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