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AssigneeOki Electric Industry Co., Ltd.
InventorsTakashi Ishiguro, Koichi Kihara, Yuzuru Masuya, Junji Arai
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An echo canceler has an adaptive filter that generates an echo replica signal from a far-end signal. The filter coefficients of the adaptive filter are updated according to a residual error signal, which is obtained by subtracting the echo replica signal from a near-end signal to cancel echo. A background noise estimator estimates the near-end background noise power level from the residual error signal. A step size calculator uses the estimated near-end background noise power in determining the step size of the adaptive updating of the filter coefficients. When the estimated near-end background noise level is high, a small step size is used, which improves echo cancellation under these conditions. When the estimated near-end background noise level is low, a larger step size is used to permit rapid convergence of the filter coefficients.
An echo canceler having an adaptive filter that generates an echo replica signal from filter coefficients and a far-end signal, and a subtractor that subtracts the echo replica signal from a near-end signal to remove an echo of the far-end signal in the near-end signal, leaving a residual error signal, the echo canceler comprising:
An echo canceling method, comprising:
Dependencies are inferred from the claim text.