Noise canceling system

Details Noise canceling system Noise canceling system

H - Electricity

04

B

325/120

H04B 1/10 (2006.01) H04R 3/00 (2006.01)

Patent

CA 1259663

ABSTRACT OF THE DISCLOSURE Under the condition where a plurality of back- ground 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-cor- relation coefficients between the outputs of the first receiver and the respective second receivers.

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