Adaptive noise cancellation device

Details Adaptive noise cancellation device Adaptive noise cancellation device

1993-12-03

1996-10-22

Coles, Sr., Edward L.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381 71, H04B 1500

Patent

active

055685587

ABSTRACT:
An adaptive noise cancellation device comprises: convolution logic (10) for convolving the signal from a reference input (x) with a discretized L-tap filter to form a filtered reference signal; and logic (20) for subtracting the filtered reference signal from a signal input to form an output signal; logic for generating the filter taps as a linear combination of N basis functions each having a corresponding coefficient C.sub.k ; and logic for repeatedly determining the coefficients C.sub.k which minimize the power in the output signal (z), characterized in that N is less than the number of filter taps L and the basis functions have respective values over a portion of finite width, outside of which portion the functions are substantially zero, both in the frequency and time domains, in an embodiment they are gaussian. A full-duplex speakerphone is disclosed including such a noise cancellation device.

REFERENCES:
patent: 5386372 (1995-01-01), Kobayashi
patent: 5414733 (1995-05-01), Turner
patent: 5416844 (1995-05-01), Nakaji

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