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How Loudspeakers Prevent Howling
- Mar 20, 2018 -

The over-representation of feedback in the sound reinforcement system is howling, which is the performance of the microphone's sound gain enhancement limit, and is the result of the peak-to-peak overlap. In response to the phenomenon of howling, many methods have been proposed to increase the sound transmission gain of the microphone, such as reasonable sound field layout, increase of sound absorption materials, change of sound reflection characteristics, and other physical means, so as to avoid such phenomena as much as possible. Occurs to meet the sound pressure requirements for normal sound reinforcement. We will not repeat them here.

The purpose of improving the sound transmission gain of the microphone through the compensation means of electro-acoustic equipment is also a means often adopted by everyone. Electroacoustic equipment compensation methods are also divided into active and passive methods.

The frequency shift is a typical active suppression method. Its working principle is that the audio signal changes the original frequency characteristics by shifting the frequency (the incoming signal is 1khz, the outgoing signal is 995hz), thus destroying the peak-to-peak superposition condition and making the frequency response The curve tends to ensure that the flat sound reinforcement system obtains a high margin space for the average microphone gain microphone, thereby actively suppressing howling.

    The control of the equalizer used for feedback is first to find the high bump of the frequency response curve, and through the control of the point, the frequency response curve tends to balance, so that the sound reinforcement system obtains the maximum transmission gain space (2-6db). The feedback suppressor works as an automatic equalizer. Therefore, the equalizer and feedback suppressor used in the live sound environment are passive feedback suppression methods.

The boost microphone gain booster has two built-in feedback suppression methods, one is pressure point (parametric equalization) and the other is frequency shift. The reason why the microphone mic boost processor can get users' very positive recognition in classrooms, conferences and other environments has two reasons.