H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 15/00 (2006.01) G10L 21/02 (2006.01)
Patent
CA 2170811
In a noise cancelling device including a first subtractor for producing a first difference signal as a noise cancelled signal by subtracting a first pseudo signal from an input signal having a main signal and a first noise signal superposed on the main signal and a first adaptive filter for processing a second noise signal correlated with the first noise signal into the first pseudo signal in accordance with filter coefficients thereof, a second subtractor subtracts a second pseudo signal from the first pseudo signal to produce a second difference signal. A second adaptive filter processes the second noise signal into the second pseudo signal in accordance with filter coefficients thereof. First and second power averaging circuits produce first and second power averages of the second difference signal and the first pseudo signal, respectively. A step size calculating circuit calculates, from the first and the second power averages, a step size used for renewing the filter coefficients of each adaptive filter in deciding a rate of convergence of each adaptive filter. The first adaptive filter renews the filter coefficients thereof into renewed filter coefficients in accordance with the second noise signal, the first difference signal, and the step size. The second adaptive filter renews the filter coefficients thereof into renewed filter coefficients in accordance with the second noise signal, the second difference signal, and the step size.
Corporation Nec
G. Ronald Bell & Associates
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