METHOD AND APPARATUS FOR REDUCING DISTORTION ECHO

摘要

Method and apparatus for reducing distortion echo are provided. K-path amplification and pre-distortion process are performed to the downlink reference signal to obtain K-path pre-distorted signals. Afterwards, filtering is performed using the self-adaptive filters which correspond to the downlink reference signal x(t) and the K-path pre-distorted signals to obtain the filtering signals. Error signals are obtained by calculating differences between the target signal and each of the filtering signals. The minimum-value fusion process is performed to the error signals to obtain the residual signal which is then output as the final self-adaptive echo cancellation. In embodiments of the present disclosure, the residual signal is relatively small as the minimum-value fusion process is performed to the error signals. That is to say, echo loss is relatively great. Therefore, the method may provide echo loss with high amplitude under a situation that a speaker has relatively serious distortion.

主权项

1. A method for reducing distortion echo, comprising:
performing K-path amplification to a downlink reference signal x(t) to obtain K-path preprocessed signals, where K is a positive integer; performing a pre-distortion process to the K-path preprocessed signals, respectively, to obtain K-path pre-distorted signals rk(t), where k=1, 2, . . . , K; performing a filtering process to the downlink reference signal x(t) and each of the K-path pre-distorted signals using a self-adaptive filter which corresponds to the downlink reference signal x(t) and the corresponding pre-distorted signal, to obtain (K+1) path filtering signals; calculating differences between a target signal d(t) and each of the (K+1) path filtering signals to obtain (K+1) path error signals; performing a minimum-value fusion process to the (K+1) path error signals to obtain a residual signal e(t); and outputting the residual signal e(t) as a final self-adaptive echo cancellation.