| 摘要 |
PROBLEM TO BE SOLVED: To provide an adaptive filter capable of realizing high-speed convergence, simple computation, high tracking capability, and sufficiently low delay together with step size control for each frequency domain. SOLUTION: An adaptive filter 80 includes: a FIR filter 90 having a matrix W(k) of adaptive coefficients for receiving input signals x(k); a subtracter 98 for computing an error signal e(k) based on a reference signal y<SB>ref</SB>(k) and an output y(k) of the FIR filter 90; a coefficient updating module 94 for updating the matrix W(k) in response to the signals x(k) and e(k) each transformed into DFT region segments and based on a predetermined probability density distribution of the error signal e(k); and a double-talk detector 96 for adaptively controlling the module 94 such that, for each of the DFT region segments, the module 94 updates the matrix W(k) only when interference and noise is present in the input signals x(k) and freezes the update when a desired signal is present in the input signals x(k). COPYRIGHT: (C)2007,JPO&INPIT
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