Noise cancellation arrangement

Details Noise cancellation arrangement Noise cancellation arrangement

A - Human Necessities

61

B

A61B 5/0444 (2006.01) G06F 17/00 (2006.01) H03H 17/02 (2006.01) H04B 15/00 (2006.01)

Patent

CA 2080292

Information collected from the primary sensor and a plurality of the reference sensors is compared to derive correlation data. A matric, representing correlation data in the time domain or cross-spectral density information in the frequency domain, is constructed based on the computed correlation data. The matrix is transformed to a diagonal matrix and a threshold value is selected with reference to one of the larger eigenvalues of the diagonalized matrix. Components of the diagonalized matrix are compared to the threshold and values greater than the threshold are used together with primary sensor correlation data to compute Wiener filter constants. The reference sensor outputs are modified by the filter constants and modified sensor outputs are substracted from the primary sensor output. A noise-cancelled output signal is then synthesized.

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