Method and system for reducing interference and noise in speech signals

摘要

Interference in an audio signal is reduced by estimating a target signal using beam-forming in a direction of the signal source. A set of estimates of interference is determined by using a microphone array filtering matrix to block the target signal in the audio signal. A set of filters is optimized by minimizing an objective function measuring a mismatch between the set of estimates of interference and the estimate of the target signal. The minimizing uses a sparse regularization of coefficients of the set of filters. The set of estimates of interference are filtered using the set of filters after the optimizing. Then, the estimate of interference after the optimizing is subtracted from the target signal.

主权项

1. A method for reducing interference in an audio signal in a form of a microphone signal acquired by an array of microphones from a source, comprising the steps of:
determining an estimate of a target signal by beam-forming the microphone signal in a direction of the source; determining a set of estimates of interference by using a microphone array filtering matrix to block the target signal in the microphone signal;optimizing a set of filters by minimizing an objective function measuring a mismatch between the set of estimates of interference, determined by the estimates of interference determining step, and the estimate of the target signal, wherein the minimizing uses a sparse regularization of coefficients of the set of filters;
filtering the set of estimates of interference using the set of filters after the optimizing; and subtracting the set of estimates of interference, filtered by the filtering step, after the optimizing from the target signal, wherein the steps are performed in a processor.