Voice enhancement method for fusing phase estimation and human ear hearing characteristics in digital hearing aid

A phase estimation and speech enhancement technology, applied in speech analysis, instruments, etc., can solve problems such as speech intelligibility, unsatisfactory comfort, loss, etc.

Active Publication Date: 2016-07-06
BEIJING UNIV OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the speech enhancement algorithm in the existing digital hearing aid in the non-stationary external noise environment, especially in the low signal-to-noise ratio environment, a large amount of background noise remains, and "music noise" is also introduced, which affects the clarity of the speech signal , resulting in the loss and distortion of part of the frequency components of the speech signal, resulting in unsatisfactory speech intelligibility and comfort for the wearer of the digital hearing aid. A digital

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  • Voice enhancement method for fusing phase estimation and human ear hearing characteristics in digital hearing aid
  • Voice enhancement method for fusing phase estimation and human ear hearing characteristics in digital hearing aid
  • Voice enhancement method for fusing phase estimation and human ear hearing characteristics in digital hearing aid

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Embodiment Construction

[0025] Step 1, preprocessing the input signal of the digital hearing aid, that is, de-averaging, normalizing, pre-emphasis, framing, and windowing;

[0026] The analog input signal x(t) of the digital hearing aid, in the analog / digital conversion process, the sampling rate is 16kHz, the converted digital signal is x(n), n represents the serial number in the time domain; in order to eliminate the DC component , using de-averaging; to avoid large errors caused by the large difference in the magnitude of input and output data, normalize the data; due to the small high-frequency energy of the voice signal, the high-frequency transmission is weakened, and the pre-emphasis is emphasized for the high-frequency part. , to improve the signal transmission quality. The de-averaging formula is shown in formula (1), the normalization formula is shown in formula (2), and the pre-emphasis formula is shown in formula (3).

[0027] x 1 (n)=x(n)-mean(x(n))(1)

[0028] In the formula, n is th...

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Abstract

The invention discloses a voice enhancement method for fusing phase estimation and human ear hearing characteristics in a digital hearing aid, comprising steps of obtaining a frequency domain expression mode containing noise through Fourier transformation, adopting a minimum value control recursive average method to obtain a noise power spectrum, obtaining initial enhancement voice and a noise amplitude spectrum, obtaining the initial enhancement voice and noise through correcting the phase of the voice and the noise through improving the phase estimation of the voice distortion under the low signal-to-noise ratio environment, performing filtering processing on the initial enhancement voice and the noise through a gammatone filter assembly which simulates the working mechanism of the artificial cochlea, performing analysis on the time frequency of the gammatone filter assembly to obtain the time frequency expression form consisting of time frequency units, using the hearing characteristics of the human ear to calculate binary mast containing noise in the time frequency domain, and using the mask value to obtain the enhanced voice after synthesis.

Description

technical field [0001] The invention belongs to the technical field of speech signal processing, and relates to two speech signal processing technologies of phase estimation and speech enhancement in digital hearing aids. Background technique [0002] Language is an important tool for humans to communicate information with each other. However, with the continuous development of society, people's demand for information is getting higher and higher, and deafness hinders normal human information exchange. According to statistics, there are about 27.8 million hearing-impaired people in my country, of which about 0 to 6 years old are hearing-impaired children. 137,000, with an annual increase of 23,000. This is a large number of social groups with outstanding difficulties. Hearing impairment and deafness have become one of the important factors affecting the quality of our population. With the advancement of science and technology, more and more attention has been paid to hearin...

Claims

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Application Information

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IPC IPC(8): G10L21/0232G10L21/0332G10L21/0224
CPCG10L21/0224G10L21/0232G10L21/0332
Inventor 李如玮王帅
Owner BEIJING UNIV OF TECH
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