A late-stage correction method for low-complexity amplitude-frequency response for digital hearing aids

Abstract

The invention discloses a post-correction method for a low-complexity amplitude-frequency response oriented to a digital hearing aid. The original signal is firstly passed through a high-pass filter to remove the DC offset, and then passed through a sub-band divider composed of a filter bank to obtain several sub-bands. , the amplitude-frequency response of several sub-band signals to be corrected and the expected amplitude-frequency response of the digital hearing aid are sent to the post-correction system for post-correction of the amplitude-frequency response of the digital hearing aid. The system adaptively selects the amplitude-frequency response through the amplitude-frequency response correction control unit. Appropriate amplitude-frequency response correction method combines strategies and correction parameters, and finally obtains a corrected amplitude-frequency response close to the expected value, which is convenient for configuring the amplitude-frequency response of digital hearing aids in a simple and efficient manner, and can adaptively correct the amplitude-frequency response later, avoiding the The calculation of FFT and IFFT, so that the complexity of the algorithm is greatly reduced, and it is more suitable for the design of digital hearing aids, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a post-correction method for a low-complexity amplitude-frequency response of a digital hearing aid. Background technique [0002] With the rapid development of industry and the aggravation of aging phenomenon, the number of people suffering from different degrees of hearing impairment continues to increase. Choosing a suitable hearing aid to improve the hearing of hearing-impaired patients is the most convenient, fast, and common method under the current medical level. And cause discomfort to the hearing-impaired and even lead to "secondary damage" and other shortcomings. Digital hearing aids have higher sound accuracy, less distortion, longer life, and can be programmed to achieve more complex calculations and adapt to different complex environments. Stronger and many other advantages make it have a broad development space in the field of hearing aids. Therefore, it ...

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Problems solved by technology

[0004] In terms of frequency response correction methods, researchers have proposed many practical methods: the published patent CN1870135A based on the masking curve frequency response compensation method of digital hearing aids uses the method of calculating the masking threshold and dividing the critical band to realize the frequency response compensation of digital hearing aids. However, due to the inclusion of calculation processes such as FFT, IFFT, calculation of extended critical band spectrum, and calculation of masking threshold, it is not suitable for low-complexity, low-computation and low-power digital hearing aid application scenarios, and although the above method can be used for However, it is not suitable for digital hearing aids that have high requirements on real-time performance, computational complexity and power consumption

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