Method and system for processing subband signals using adaptive filters

An adaptive filter and self-adaptive technology, applied in the field of signal processing, can solve problems such as signal distortion of gap filter banks, high calculation consumption, slow convergence of crossover filters, etc.

Inactive Publication Date: 2010-05-26
SEMICON COMPONENTS IND LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Systems with interleaved filters converge slower and are computationally expensive, while gapped filter banks produce significant signal distortion

Method used

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  • Method and system for processing subband signals using adaptive filters
  • Method and system for processing subband signals using adaptive filters
  • Method and system for processing subband signals using adaptive filters

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Embodiment Construction

[0034] Figure 1-3 A subband adaptive filter (SAF) system according to an embodiment of the invention is illustrated. Figure 1-3 The SAF systems 10A-10C in have the function of improving the convergence performance of the adaptive filter. The SAF system is implemented by using an Oversampled Weighted Addition (WOLA) filter bank. On pages 569-572 of U.S. Patent No. 6,236,731, U.S. Patent No. 6,240,192 and Proc.IEEE Int.Symp. Such an oversampled WOLA filterbank is described in "Extensive Signal Manipulations In Digital Hearing Aids" ("A Flexible Filterbank Architecture for Extensive Signal Processing in Digital Hearing Aids"), incorporated herein by reference. Such an oversampled WOLA filter bank can be implemented using digital signal processor (DSP) technology.

[0035] This oversampled WOLA filter bank has a WOLA analysis filter bank for converting an input signal into an oversampled subband signal, a subband signal processor for processing the oversampled subband signal ...

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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 includesan 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 ofthe 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.

Description

technical field [0001] The present invention relates to signal processing, and more particularly to methods and systems for processing subband signals using adaptive filters. Background technique [0002] It is well known that a noise cancellation system can be implemented with a fullbank adaptive filter operating over the entire frequency band of interest. The Least Mean Square (LMS) algorithm and its variants are often used to make full-band filters with relatively low computational complexity and sufficient performance when the interfering signal is white noise. However, due to the large number of eigenvalue expansions and slow convergence, this full-band LMS solution suffers from a significant reduction in performance with colored interference signals. Furthermore, when increasing the length of the LMS filter, the convergence rate of the LMS algorithm decreases and the computational requirements increase. This is problematic in applications such as acoustic echo cancel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02H03H21/00H04B3/23H04R3/02G10L21/0272
CPCH04B3/234H03H2021/0089G10L21/0208H03H2021/0041H03H21/0012G10L25/18
Inventor H·R·阿布塔利布R·L·布伦南H·谢赫扎德-纳贾D·孙
Owner SEMICON COMPONENTS IND LLC
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