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The basic principle of feedback suppressor
Release Date：[2011-10-10 16:38:29]    Total read [252] Times

In order to improve the transmission gain, initially people use console equalizer attenuating howling frequency energy to eliminate whistle, improving transmission gain. But because often mixer equalizer bandwidth is wide, in the attenuation of howling frequency components also removed a lot of useful signal frequency, damage to the sound. Later people will mixer microphone circuit insert ( string ) a parametric equalizer ( or use a parametric equalizer mixer ), regulation of parametric equalizer frequency and Howling frequency consistent after decay, by adjusting Q ＆#118alue, can make the equalizer attenuation of the slope is very steep, very narrow frequency band, only resection possible squeak disturbance frequency, little influence on other frequency sound signal, reduces the influence on the sound.

But this adjustment is more complex, difficult to spot when the strain, if at the same time using a microphone or microphone, replacement, replacement venue performances activities to different places and so on, can make the howling frequency changes, to whistle control brings a lot of difficulties. Some early manufacturers use these principles into the production of adjustable frequency, adjustable frequency, adjustable attenuation depth feedback suppressor, but because of the suppression of frequency point is not much, the complex sound field caused by acoustic feedback, is still difficult to control. Moreover, because the frequency is fixed, sometimes removed yet howling frequency signal and affect the timbre.

In recent years, there has been the use of computer technology to create a quick scan, automatically find out the feedback signal frequency, and can automatically generate a group and the evening quite the same narrowband filter resection howling frequency signal, and inhibitory feedback, improving transmission gain peripheral equipment automatic feedback suppressor.

The correct use of these devices, can make the sound gain is increased by 6 ~ 12dB, greatly improved the live sound effects.