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Self-adaption acoustic feedback elimination method and system based on transformation domain

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

Active Publication Date: 2014-07-16
厦门莱亚特医疗器械有限公司
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  • Abstract
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  • Claims
  • 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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  • Self-adaption acoustic feedback elimination method and system based on transformation domain
  • Self-adaption acoustic feedback elimination method and system based on transformation domain
  • Self-adaption acoustic feedback elimination method and system based on transformation 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 field of acoustic technologies, in particular to a self-adaption acoustic feedback elimination method and system based on a transformation domain. According to the self-adaption acoustic feedback elimination method and system based on the transformation domain, self-adaption acoustic feedback elimination is achieved through the steps of audio signal collection, signal time frequency transformation, self-tuning coefficient calculation, autocorrelation matrix calculation, matrix equation fast solution, frequency domain filtering, feedback elimination, filter coefficient updating and signal time frequency inverse transformation. By the adoption of the self-adaption acoustic feedback elimination method and system, acoustic feedback elimination is achieved, damage to target audio signals can be reduced, and the good feedback elimination effect can be achieved and high audio quality can be maintained under the environment that feedback paths dynamically change. By the adoption of the algorithm estimation feedback path transfer function principle, the target audio signals and feedback signals are separated, and feedback elimination is achieved without being limited by specific types of the feedback paths, the number of the feedback paths, the spatial topological structure of a target acoustic source and the spatial topological structure of a feedback acoustic source or generating large audio damage.

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 Applications(China)
IPC IPC(8): H04R25/00
Inventor 梁维谦薛行栋
Owner 厦门莱亚特医疗器械有限公司
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