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Multi-channel wide dynamic range compressing system for digital hearing aid

A wide dynamic range, compression system technology, used in hearing aids, digital technology networks, impedance networks, etc., can solve problems such as time difference and signal distortion, achieve reduced group delay, high efficiency, and overcome problems that cannot be realized in real time and phase distortion. Effect

Inactive Publication Date: 2010-04-14
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

However, since the group delay of the all-pass filter is related to frequency, the system will cause different frequency components of the signal to pass through the system at different times, resulting in signal distortion. often severe

Method used

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  • Multi-channel wide dynamic range compressing system for digital hearing aid
  • Multi-channel wide dynamic range compressing system for digital hearing aid
  • Multi-channel wide dynamic range compressing system for digital hearing aid

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Embodiment Construction

[0057] Such as figure 1 As shown, the multi-channel wide dynamic range compression system based on the auditory perception model disclosed by the present invention includes an analysis filter bank 2 simulating the auditory perception model, a sound pressure level detection module 3, a compression amplification gain calculation module 4, a multiplier 5 and an analog The auditory perception model synthesizes filter banks with 6 five main parts. The input digital signal x(n)1 is divided into K channels after the analysis filter bank 2 of the simulated auditory perception model, the sound pressure level detection module 3 detects the sound pressure level of each channel, and the compression amplification gain calculation module 4 calculates each channel the specific gain value, the multiplier 5 multiplies the channel gain value with the corresponding sub-band signal, and the obtained result is synthesized into an output signal y(n)7 through the synthesis filter bank 6 simulating t...

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Abstract

The invention relates to a multi-channel wide dynamic range compressing system based on an audition perception model. The multi-channel wide dynamic range compressing system comprises an analysis filter group for simulating an audition perception model, a sound pressure level detecting module, a compression amplification gain calculating module, a multiplier and an integrated filter group for simulating the audition perception model, wherein audio digital signals x (n) are divided into K channels after passing through the analysis filter group, the sound pressure level detecting module is used for detecting the sound pressure level of each channel, the compression amplification gain calculating module is used for calculating the specific gain value of each channel, the multiplier can multiply the gain values of the channels with corresponding sub-band signals, and the obtained results of the multiplier are integrated into a path of output signal y (n) through the integrated filter group, the integrated filter group respectively carries out the all-pass transformation and all-pass inverse transformation in an analysis filter group and an integrated filter group of a weighted splice adding structure through the mode of combining the weighted splice adding structure and the all-pass transformation, and can simulate ear audition resolution of a human under the condition of fewer channels.

Description

technical field [0001] The invention relates to the digital signal processing technology in the digital hearing aid, in particular, relates to a multi-channel wide dynamic range compression system for the digital hearing aid, which is used for compressing and amplifying the audio signal of the digital hearing aid. Background technique [0002] Hearing loss, especially sensorineural hearing loss, is not only manifested as an increase in the hearing threshold, but the discomfort threshold of most patients remains unchanged or even decreases, resulting in a decrease in the wide dynamic range of hearing. In response to this feature, digital hearing aids usually use wide dynamic range compression (WDRC), which compresses the wide dynamic range of the input signal to the residual hearing dynamic range of the hearing-impaired. In addition, hearing-impaired people may have the same perception of sound in a certain frequency range as ordinary people, but they cannot hear sounds with ...

Claims

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Application Information

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IPC IPC(8): H04R25/00H03H17/00
Inventor 孟晓辉肖灵崔杰
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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