WOLA (Weighted-Overlap Add) filter bank based signal processing method for all-digital hearing aid

A filter bank and signal processing technology, applied in hearing aids, impedance networks, adaptive networks, etc., can solve the problems of low sub-band energy compensation range and high-frequency signal distortion, and achieve improved hearing aid effects, low latency, The effect of eliminating feedback

Inactive Publication Date: 2011-11-23
SHANGHAI CONGWEI ACOUSTICS TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a low-power, low-delay and high-precision digital hearing aid signal processing method based on WOLA filter ban...

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  • WOLA (Weighted-Overlap Add) filter bank based signal processing method for all-digital hearing aid
  • WOLA (Weighted-Overlap Add) filter bank based signal processing method for all-digital hearing aid
  • WOLA (Weighted-Overlap Add) filter bank based signal processing method for all-digital hearing aid

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Embodiment Construction

[0020] see figure 1 , the signal processing method based on the WOLA filter bank of the all-digital hearing aid of the present invention mainly comprises the following steps:

[0021] The first step is to use a preset algorithm in the time domain to sample the input signal connected to the microphone at a preset sampling frequency and perform adaptive filtering after being divided into blocks. In this embodiment, the input signal x(t) is sampled at a sampling frequency of 32000 Hz (it should be noted that, in order to improve the quality of the voice signal, generally, the input signal x(t) can be the currently accessed signal x i (t) and the feedback signal x of the previous hearing aid output signal y(t) after passing through the external equivalent feedback loop f (t) superimposed signal) sampling to form 16bit quantization, signal bandwidth is 16000Hz sampling digital signal x(n) mixed with feedback, and then it is divided into blocks, the length of each sampling block R=...

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Abstract

The invention relates to a WOLA (Weighted-Overlap Add) filter bank based signal processing method for an all-digital hearing aid, which comprises the following steps of: firstly, sampling and blocking input signals of microphone access at a preset sampling frequency by using a preset algorithm in a time domain, and performing adaptive filtering; secondly, performing serial parallel conversion, analysis window interception and discrete Fourier transform on the adaptively filtered signal so as to separate each frequency sub-band; thirdly, calculating the target gain according to the preset sound pressure input gain curve, processing the calculated target gain through a 1-order IIR (Infinite Impulse Response) filter to obtain real-time dynamic gain, and compressing each frequency sub-band signal according to the real-time dynamic gain; and finally, transforming the compressed signals from a frequency domain to a time domain, and performing comprehensive window processing and parallel serial conversion on the obtained time domain signals to form serial signals to be output. Therefore, the problems of whistling, serious high-frequency signal distortion and too low sub-band energy compensation range of the traditional digital hearing aid during high magnification can be effectively solved.

Description

technical field [0001] The invention relates to a signal processing method of a full digital hearing aid, in particular to a signal processing method of a full digital hearing aid based on a WOLA filter bank. Background technique [0002] With the continuous aging of Chinese society and the continuous improvement of the quality of life, people pay more and more attention to the problem of deafness, and the development and use of hearing aids have gradually attracted people's attention. Surveys show that 1 out of every 10 people in the world has hearing loss, and they can all benefit from the use of hearing aids. However, the causes of hearing impairment are different, and the hearing loss is quite different, so each patient has different requirements for hearing aids. Due to the limitations of its circuit functions, traditional hearing aids often only process speech signals in the time domain or frequency domain, which cannot meet the requirements of patients. Moreover, tr...

Claims

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Application Information

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IPC IPC(8): H04R25/00H03H21/00
Inventor 郭跃
Owner SHANGHAI CONGWEI ACOUSTICS TECH
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