The Effective Way to Prevent Howling of Microphone

- Jul 11, 2018-

Improving the microphone's sound gain is an effective way to prevent howling. The so-called howling is the excessive performance of the feedback in the sound reinforcement system of the sound, which is the performance of the microphone sound gain boost limit, and is the result of peak superposition. Into the research, it is found that the method of improving the sound transmission gain of the microphone can avoid such phenomena as much as possible. The specific means such as reasonable sound field arrangement, increase of sound absorbing material, change the reflection characteristics of sound, etc., to meet the sound pressure demand of normal sound reinforcement. .

To increase the microphone sound gain. Mainly divided into active mode and passive mode.

Frequency shifting is a typical active suppression method. Its working principle is that the audio signal changes its original frequency characteristics by frequency shifting (the incoming signal is 1KHz, and the outgoing signal is 995Hz), which destroys the condition of peak superposition and makes the frequency response curve The tendency of the flat sound reinforcement system to obtain a higher average sound gain microphone margin is guaranteed, thereby actively suppressing howling.

The equalizer is used to control the feedback. Firstly, the high burst point of the frequency response curve is found. By controlling the point, the frequency response curve is balanced, so that the sound reinforcement system can obtain the maximum sound gain space (2-6dB). The feedback suppressor works as an automatic equalizer. Therefore, the equalizer and feedback suppressor used in the live sound reinforcement environment is a passive feedback suppression method.

The booster microphone gain boosting processor has two built-in feedback suppression methods, one is the pressure point (parametric equalization) mode, and the other is the frequency shifting mode. The pitch microphone gain boost processor is often used in KTV, conference and other environments.

The booster microphone gain boost processor has the following four advantages:

First, the feedback suppressor for today's sound reinforcement environment is the most comprehensive means of boosting the microphone gain boosting processor. It has two methods: active suppression (frequency shifting) and passive suppression (parametric equalization).

Second, the mic gain boost processor has almost no audible distortion. The conventional feedback suppressor has a constant pressure point amplitude of -9dB in the automatic state, which inevitably causes great hearing distortion. Due to the processing speed, many feedback suppressors produce a phenomenon of sound lag.

Third, after accessing the system, it is easy to sing and talk without the need of debugging, and prevent the whistling. In terms of the system's sound gain enhancement capability, the booster microphone gain boost processor can be boosted by 3-8dB. The traditional feedback suppressor can only improve 2-6dB, and it requires complicated debugging.

Fourth, the line interface with the microphone. Conventional feedback suppressors have only line interfaces, and many card package amplifiers do not have a line access point for the microphone. If the feedback suppression process is not available, this makes the conventional feedback suppressor unusable in such an environment.



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