Adaptive sub-band audio feedback suppression method

An audio feedback and self-adaptive technology, applied in frequency response correction, electrical components, signal processing, etc., can solve problems such as sound reinforcement system howling and insufficient sound transmission gain, reduce mutual influence and interference, improve processing efficiency, Effect of system cost reduction

Active Publication Date: 2017-02-22
FOSHAN UNIVERSITY +1
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art, provide a method based on adaptive sub-band audio feedback suppression, and solve the

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  • Adaptive sub-band audio feedback suppression method

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0037] Such as figure 1 As shown, M_in is the sampling signal of one road microphone, and S_out is the signal output to the power amplifier after feedback suppression processing, and a kind of adaptive sub-band audio feedback suppression algorithm of the present invention comprises the following steps:

[0038] Step 1: Divide the microphone signal M_in obtained by sampling and the reference signal S_out output to the power amplifier into data blocks (Data Block) in the order of sampling time, and perform sub-band filter filtering on the divided data blocks to obtain the sub-bands of the microphone and the power amplifier respectively. with signal. The size of the data block is determined by th...

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Abstract

The present invention discloses an adaptive sub-band audio feedback suppression method. The method comprises the steps of segmenting an input signal according to a sampling sequence to obtain data blocks; allowing the data blocks to pass a sub-band filter to obtain sub-band signals of a power amplification signal and an input signal; allowing the sub-band signals to pass an adaptive sub-band feedback filter to deduce a microphone feedback sub-band signal generated by a speaker signal, performing weighing energy analysis and statistics on the sub-band signal, and correcting the adaptive sub-band feedback filter; synthesizing input sub-band signals expect the feedback sub-band signal and recovering to obtain a time domain signal; and sending the recovered time domain signal to the speaker for sound amplification. The method has the advantages that the signal filter is segmented into sub-bands, so that the correlation between the sub-band signals is lowered, a convergence problem of the adaptive filter is solved, data processing amount of the system is reduced, the feedback suppression processing efficiency is improved, the sound gain of the sound amplification system is improved, the sound amplification quality is improved, and the sound gain can be increased by over 6 decibel stably, at most 15 decibel.

Description

technical field [0001] The invention relates to an adaptive sub-band audio feedback suppression method, and belongs to the technical fields of signal processing and speech signal processing. Background technique [0002] Feedback (howling) in sound reinforcement applications has a long history. Almost all of us have such an experience: in order to increase the sound transmission gain and increase the speaker's sound reinforcement output volume during sound reinforcement, it often causes harsh howling in the sound reinforcement system when the volume is increased; this is the common sound reinforcement system. Feedback self-excitation (also called howling) phenomenon. In order to solve the problem of low volume in sound reinforcement, how to increase the sound transmission gain is a key issue while ensuring that the sound reinforcement system does not have feedback self-excitation. Looking at this problem from the perspective of control theory, this is a typical feedback lo...

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Application Information

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IPC IPC(8): H04R3/04
CPCH04R3/04H04R2430/00
Inventor 杨骏
Owner FOSHAN UNIVERSITY
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