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Wide-dynamic compression algorithm of digital hearing aid under noise condition

A compression algorithm and wide dynamic technology, applied in hearing aids, electrical components, etc., can solve the problems of reducing intelligibility and comfort, losing audio signals, etc., and achieve the effect of noise cancellation

Inactive Publication Date: 2015-06-10
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

The general wide dynamic range compression algorithm makes the output sound pressure level 0, which loses part of the information of the audio signal, and also reduces the intelligibility and comfort

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  • Wide-dynamic compression algorithm of digital hearing aid under noise condition
  • Wide-dynamic compression algorithm of digital hearing aid under noise condition

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] attached figure 1 It is the hearing threshold and pain threshold level curves of patients and normal people at each frequency point, and the hearing loss is about 50dB. where TH hi for patient hearing thresholds, UL hi is the pain threshold of the patient; TH n Hearing threshold for normal people, UL n Pain threshold for normal people. The hearing threshold level and pain threshold level of normal people are certain, and may be different due to gender reasons; but the hearing threshold level and pain threshold level of hearing loss patients are different from individual to individual, s...

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Abstract

The invention provides a wide-dynamic compression algorithm of a digital hearing aid in a noise environment. The wide-dynamic compression algorithm comprises the following steps of (A) outputting a de-noised voice signal by means of a voice enhancement algorithm, (B) estimating a voice signal output feedback path, performing boundary checking calculation and performing calculation and output according to three self-adaptive wide-dynamic compression rules, (C) using an output obtained the step A and an output obtained the step B as an input of a wide-dynamic compression module to perform voice signal compression and amplification and improve signal-noise ratio. When the sound pressure level of an outside sound source is smaller than hearing threshold of a normal person according to a traditional compression algorithm, the hearing aid ordinarily does not start the compression algorithm, the output sound pressure level is set as 0, and therefore a part of information of audio signals is lost. By means of the wide-dynamic compression algorithm, the process is improved and optimized, the part of information of audio signals with the sound pressure level smaller than hearing threshold of the normal person is kept, and meanwhile a noise elimination function is provided.

Description

technical field [0001] The invention relates to the technical field of speech signal processing, in particular to a wide dynamic compression algorithm for digital hearing aids. Background technique [0002] Among the various algorithms of hearing aids, the hearing compensation algorithm is the most basic and important algorithm. The purpose of the hearing compensation algorithm is to compress and amplify the sound, map the hearing dynamic range of normal people to the hearing dynamic range of hearing-impaired patients through algorithm processing, and keep the sound recognition and low distortion as much as possible. The environment in which hearing aids are used often contains a lot of noise, so speech denoising must first be performed before dynamic compression. [0003] The dynamic range of hearing refers to the range of sound intensity that the human ear can feel unbearable to a sound of a certain frequency or a certain type of sound from just hearing it. Therefore, th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R25/00
Inventor 刘明王明江曾伟浩蒋贤慧王兆阳张健曹彬
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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