Method and device for judging and eliminating howlround
A vibration data and frequency point technology, applied in the field of electronics, can solve the problems of complicated and difficult implementation of howling elimination methods, and achieve the effect of simple and convenient judgment and elimination, and low cost.
Active Publication Date: 2012-01-11
SHENZHEN HEZHI CHUANGYING ELECTRONICS
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[0004] Among the above two methods, the method of eliminating howling is more complicated and difficult to implement, and the key to eliminating howling lies in the judgment of howling
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[0042] The embodiment of the present invention provides a method and device for judging and eliminating howling. The sensor module senses the vibration data of the loudspeaker; the vibration data within a certain period of time is calculated to obtain characteristic data, and the characteristic data includes frequency, One or more of amplitude and envelope data; according to the characteristic data, it is judged whether howling is about to occur or whether it is in the early stage of howling; when it is judged that howling is about to occur, according to the pre-stored howling frequency point data Preventive elimination of the howling of the sound signal to be output; when it is judged that it is in the initial stage of howling, the howling signal in the sound signal to be output is eliminated in real time, and the method and device provided by the embodiment of the present invention can be simple and convenient Realize the judgment and elimination of howling, and the cost is l...
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The invention provides a method for judging and eliminating howlround, which comprises the steps of: sensing vibration data of a speaker through a sensor module; computing the vibration data in a certain time to obtain characteristic data, wherein the characteristic data comprises one or more frequency, amplitude and enveloped data; judging whether the speaker generates howlround or whether the speaker is in an initial stage of generating the howlround according to the characteristic data; when judging that the speaker is about to generate howlround, carrying out howlround preventive elimination on a sound signal to be output according to prestored howlround frequency point data; and when judging that the speaker is in the initial stage of generating the howlround, eliminating a howlround signal in the sound signal to be output in real time. Correspondingly, the embodiment of the invention also provides a device for eliminating the howlround. By using the method and the device provided by the embodiment of the invention, the howlround can be simply and conveniently judged and eliminated with low cost.
Description
technical field [0001] The invention relates to the field of electronics, in particular to a method and device for judging and eliminating howling. Background technique [0002] In an audio system composed of a microphone and a loudspeaker, a part of the sound signal output by the loudspeaker often enters the output of the system equipment through the microphone again. Due to such a positive feedback phenomenon, when the output signal strength of the loudspeaker reaches the full scale of the system equipment, howling will occur. Howling will destroy the normal operation of the system, so howling suppression is required. [0003] In order to solve this problem, a variety of methods for eliminating howling have been proposed in the prior art. Among them, the Chinese invention patent No.: 200580006536.3 introduces a method of eliminating howling by using dual microphones to suppress the impact of the amplifier on the The howling generated when the target sound received from th...
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Inventor 廖明忠
Owner SHENZHEN HEZHI CHUANGYING ELECTRONICS