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Speech enhancement method applied to deaf-aid

A technology for speech enhancement and hearing aids, used in hearing aids, speech analysis, instruments, etc.

Inactive Publication Date: 2007-05-23
北京大学科技开发有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention specifically solves three problems: one is how to accurately estimate the noise spectrum; the other is how to adjust the noise-containing speech spectrum to suppress noise components; the third is how to use the auditory perception mechanism to make the sound more natural and obtain better intelligibility

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Embodiment Construction

[0031] A preferred embodiment of the present invention will be described in more detail below with reference to the accompanying drawings of the present invention.

[0032] According to the speech enhancement method based on auditory perception of the present invention, the overall structural block diagram of the system is shown in FIG. 1 , and the system structure will be described in detail below in conjunction with the accompanying drawings.

[0033] 1. Implementation of endpoint detection (VAD):

[0034] The characteristic parameters used in this embodiment are defined as follows:

[0035] Assuming that x(n) is the noisy speech signal after framing, and X(k, l) is the magnitude spectrum of its lth frame and kth band, then the N-order long-term spectral envelope (Long-Term Sprctral Envelop-LTSE) defined as:

[0036] LTSE ( k , l ) = max { ...

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Abstract

The invention provides a speech enhancement method that can restrain noise component in noisy voice and improve voice quality and intelligibility in noise environment. According to the method of the present invention, it specifically includes the following steps: 1) first, estimating the noise spectrum of the speech using endpoint detection technology; 2) removing noise using two-step Wiener filter technology; 3) meanwhile, adjusting the filter parameters according to auditory masking curve. The de-noising method in the invention has undertaken a thorough study and consideration on the signal level and perceptual level. For the estimation of noise, it uses the endpoint detection method, which has good robustness, to accurate estimate the noise spectrum as far as possible. Furthermore, it uses a two-step Wiener filter to solve this problem. Meanwhile, taking into account people's ears, by using auditory masking curve, it decreases the signal distortion. Thus, the eventually enhanced signal has a big increase on the voice quality and intelligibility.

Description

technical field [0001] The invention belongs to the field of speech signal processing, and relates to a speech enhancement method of a hearing aid, in particular to a method for improving speech quality and speech intelligibility in a noise environment in a hearing aid. Background technique [0002] Speech communication is the basic way of communication in human society, and it is also one of the basic living abilities of individuals. However, for those deaf patients, the impairment of speech communication due to hearing loss seriously affects their quality of life. This not only brought great pain to himself and his family, but also increased the burden on the whole society. According to a statistics released by the China Disabled Persons' Federation on February 7, 2002, there are 20.57 million disabled people with hearing and speech impairments in my country, accounting for 34.3% of the total number of 60 million disabled people in the country. In addition, due to geneti...

Claims

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Application Information

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IPC IPC(8): G10L21/02H04R25/00G10L21/0216G10L25/87
Inventor 迟惠生吴玺宏韩润强张志平
Owner 北京大学科技开发有限公司
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