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A method and system for adaptive acoustic feedback cancellation based on transform domain

An acoustic feedback and adaptive technology, applied in the field of acoustics, can solve problems such as inability to obtain effects

Active Publication Date: 2017-09-22
欧仕达听力科技(厦门)有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Due to the limitations of the basis for judgment, this method often cannot achieve good results

Method used

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  • A method and system for adaptive acoustic feedback cancellation based on transform domain
  • A method and system for adaptive acoustic feedback cancellation based on transform domain
  • A method and system for adaptive acoustic feedback cancellation based on transform domain

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Embodiment Construction

[0053] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0054] As a specific embodiment, the embodiment of the present invention uses one microphone as an example, such as figure 1 As shown, the microphone simultaneously collects the target sound source and the sound signal leaked from the speaker to the microphone to obtain an audio signal with a feedback signal. In order to illustrate the present invention better, at first do a simple description to the circuit structure in the present invention, refer to figure 2 As shown, the present invention is realized based on the following hearing aid circuit structure, including a microphone, an audio signal acquisition module, a digital signal processor, a digital-to-analog converter and a loudspeaker, and the audio signal acquisition module includes a band-pass filter, a preamplification module and an analog Digital converter, the audio signal collected by t...

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Abstract

The invention relates to the technical field of acoustics, in particular to a method and system for adaptive acoustic feedback elimination based on transform domain. A method and system for adaptive acoustic feedback elimination based on the transform domain of the present invention, through audio signal acquisition, signal time-frequency conversion, self-tuning coefficient calculation, autocorrelation matrix calculation, matrix equation fast solution, frequency domain filtering, feedback The steps of elimination, filter coefficient update, and signal time-frequency inverse transformation realize adaptive acoustic feedback elimination. The invention realizes the elimination of acoustic feedback and can reduce the damage to the target audio signal, and can obtain better feedback elimination effect and maintain higher audio quality under the environment of dynamic change of the feedback path. This technology uses the principle of algorithm to estimate the transfer function of the feedback path to separate the target audio signal from the feedback signal, so as to achieve feedback elimination, and the specific type of feedback path, the number of various feedback paths, the target sound source and the feedback sound source It is independent of the spatial topology of the audio and does not produce large audio impairments.

Description

technical field [0001] The invention relates to the technical field of acoustics, in particular to a method and system for adaptive acoustic feedback elimination based on transform domain. Background technique [0002] Hearing aids have become an essential part of everyday life for many hearing-impaired people. The shape of hearing aids has gradually shrunk from traditional box-type devices worn on the body to concealed in-ear devices that are directly inserted into the ear canal, and the internal signal processing method of hearing aids has also transitioned from analog circuits to current digital signal processors. Due to the reduction in the size of the hearing aid, the relative distance between the microphone and the speaker of the earphone is much smaller than that of the traditional box-type machine. Therefore, under the same amplification gain, the earphone is more likely to generate feedback than the box-type machine, thus This leads to howling, which eventually mak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R25/00
Inventor 梁维谦薛行栋
Owner 欧仕达听力科技(厦门)有限公司
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