US 2004/0071284 A1 · Method and system for processing subband signals using adaptive filters

Abstract

A method and system for processing subband signals using adaptive filters is provided. The system is implemented on an oversampled WOLA filterbank. Inputs signals are oversampled. The system includes an adaptive filter for each subband, and the functionality of improving the convergence properties of the adaptive filter. For example, the convergence property is improved by whitening the spectra of the oversampled subband signals and/or affine projection algorithm. The system is applicable to echo and/or noise cancellation. Adaptive step size control, adaptation process control using Double-Talk detector may be implemented. The system may further implement a non-adaptive processing for reducing uncorrelated noise and/or cross-talk resistant adaptive noise cancellation.

Claims22

Dependent claims

A method of processing subband signals for cancelling an undesired effect on a signal, the method comprising steps of:

analysing a primary signal, which has a signal affected by an undesired signal, and a reference signal corresponding to the undesired signal, to produce frequency domain primary signals and frequency domain reference signals in a plurality of subbands;
processing the frequency domain primary signal and the frequency domain reference signal using an adaptive filter in each subband, comprising operating on at least the frequency domain reference signal to improve the convergence of the adaptive filter in each subband;
and
synthesizing the outputs of the adaptive processing blocks to output a time domain signal in which the effect of the undesired signal has been cancelled.

1 more element

Dependencies are inferred from the claim text.

Method and system for processing subband signals using adaptive filters

Life of this patent

Method and system for processing subband signals using adaptive filters

Life of this patent

Abstract

Claims22