How to prevent howling from microphones and sound systems?

How to prevent howling from microphones and sound systems?

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Update time : 2021-06-10 10:54:03
In the last article, Sinbosen talked to everyone about the causes of howling microphones. So today, let's take a look at how we can deal with this situation.

How to suppress howling

In the practice of sound reinforcement, the sound engineers have summarized many methods to suppress the howling of the sound system. Experts have taken some effective measures to eliminate acoustic howling. Electroacoustic experts have developed and developed a variety of electroacoustic equipment to reduce the occurrence of acoustic howling. These practical measures have achieved good results after being applied. The effect of how to suppress, reduce and eliminate howling is briefly introduced below.

Make the sound of the speaker difficult to pass into the microphone

1) Microphone away from speakers

This method is difficult to implement in KTV, because the area of ​​KTV is generally not large. But in theaters or large performance venues, this approach can help. For example, consider hanging a microphone over a band or stage to pick up the sound. This can not only ensure that the microphone is close enough to the sound source, but also keep the microphone and the speaker as far away as possible.

2) Decrease the volume of the microphone

If the microphone volume is too high, the probability of ringing will increase, and the volume must be reduced in time to avoid howling. In addition, if you need to pass the speaker while holding a handheld or wearing a microphone, you should also pay attention to controlling the volume, otherwise it will cause serious howling due to being too close.

3) Make good use of the directivity of speakers and microphones

Both the microphone and speakers are directional. If the microphone is used in a location other than the radiation area of the speaker sound, the sound of the speaker will not be easily transmitted to the microphone. Similarly, if the speaker is not in the pickup area of the microphone, it is difficult for the microphone to pick up the sound of the speaker. Therefore, by properly adjusting the angle of the speaker, avoid the speaker's playback area when using the microphone, or let the sound radiation area of the speaker not overlap with the area where the microphone is used.

Howling suppression with electroacoustic equipment

1) Frequency shifter

Changing the frequency of a sound with a frequency shifter can disrupt the conditions that create howling. However, this device has certain limitations and is not suitable for use in singing and musical instruments. It can increase the sound signal by 5Hz, and it works well when the speech is amplified, because the frequency range of the language is between 130 and 350Hz, and the change of the 5Hz frequency will not make people feel that the pitch is high. The lower limit frequency of vocal and instrumental music is about 20Hz, and the tone change of 5Hz has a very clear tone change.

2) Limiter

The limiter can automatically change the output signal amplification according to the strength of the input signal. So when the volume is so loud that howling is about to occur, the intensity of the sound signal exceeds the threshold through the limiter. However, the use of a limiter to suppress howling will cause a loss of dynamic sound.

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