Noise canceling apparatus

Details Noise canceling apparatus Noise canceling apparatus

1986-10-30

1988-09-06

Isen, Forester W.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

H04B 1500

Patent

active

047698470

ABSTRACT:
In order to eliminate background noise infiltrating into an input audio signal, a noise-canceling apparatus includes: first and second acoustic pickups for primarily picking up the audio signal and noise, respectively; a filter receiving the output of the second acoustic pickup; a subtracter for subtracting the output of the filter, when the audio signal is silent, from the output of the first acoustic pickup; and a coefficient determination for determining coefficients of the filter so as to make the filter generate a noise signal corresponding to a signal generated by passing the noise through a transmission path having a transmission frequency characteristic from the noise source to the first acoustic pickup. The coefficients of the filter are determined on the basis of mutual-correlation coefficients between the outputs of the first and second pickups and self-correlation coefficients of the output of the second pickup, thereby improving the processing efficiency.

REFERENCES:
patent: 4649505 (1987-03-01), Zinser, Jr. et al.

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