Conference sound amplification system howling suppression method

A sound reinforcement system and conference technology, applied in the direction of sound reinforcement systems, voice analysis, instruments, etc., can solve the problems of lowering the sound quality, a large number of traps, and a great impact on sound quality

Inactive Publication Date: 2020-05-19
SYSU HUADU IND SCI & TECH INST +1
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Problems solved by technology

But when the howling frequency increases, the number of notch filters will also increase, which will greatly damage the useful signal and greatly reduce the sound quality, especially when the howling frequency point identification is not accurate enough, it will have a greater impact on the sound quality

Method used

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  • Conference sound amplification system howling suppression method
  • Conference sound amplification system howling suppression method
  • Conference sound amplification system howling suppression method

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[0069] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0070] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0071] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0072] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0073] like Figure 2-3 Shown, a kind of howling suppression method of conference sound reinforcement system, comprises the following steps:

[0074] S1: Receive the acoustic signal of the meeting room site and convert it into an analog electrical signal, and convert the analog electrical signal into a digital signal;

[0075] S2: designing a decorrelation processing algorithm, and processin...

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Abstract

The invention provides a conference sound amplification system howling suppression method, and the method adopts a frequency shift method and a multi-all-pass filtering random combination method to destroy a phase condition generated by howling, and adopts three steps to detect a howling signal frequency value in a howling signal filtering method, including FFT preliminary detection, double-amplitude refinement and absolute amplitude calculation comparison.

Description

technical field [0001] The invention relates to the technical field of sound signal processing, and more particularly, to a howling suppression method for a conference sound reinforcement system. Background technique [0002] In the conference sound reinforcement system, the sound signal is played through the speaker, and the sound wave is reflected by the ceiling, floor, wall, and desktop of the conference room, and part of the sound wave is picked up by the microphone, and then broadcast after being amplified by the sound reinforcement system, such as figure 1 shown. After many cycles in this way, a positive feedback of "speaker system→microphone→acoustic signal processing equipment→power amplifier→speaker system" will be formed in the sound reinforcement system, so that the output signal amplitude of some frequencies will continue to increase, resulting in oscillation and howling. The generation of howling will make the audience feel extremely unhappy, and even cause dam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R27/00G10L21/0208
CPCH04R27/00G10L21/0208H04R2227/009
Inventor 徐永键陆许明谭洪舟
Owner SYSU HUADU IND SCI & TECH INST
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