Speech enhancement method applied to deaf-aid

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...

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