In the sound reinforcement system, if the microphone volume is greatly increased, the sound from the speaker will be transmitted to the microphone to cause howling, which is the acoustic feedback. Sound feedback not only destroys the sound quality and the atmosphere, but excessive sound feedback can also make the system signal too strong, thus burning the amplifier or the speaker (generally burning the speaker's tweeter).
Before the emergence of feedback suppressors, sounders often used equalizer pull points (attenuated feedback frequencies) to suppress acoustic feedback. The reason why the sound reinforcement system produces acoustic feedback is mainly because the sound of some frequencies is too strong. Attenuating these excessive frequencies can solve this problem. However, using the equalizer pull-down can produce the following insurmountable deficiencies: The sound level of the sound engineer is extremely high. After the feedback, the sound engineer must judge the feedback frequency and degree in a timely and accurate manner, and immediately attenuate the frequency of the equalizer accurately. This is not rich in experience. It is difficult for the sound engineer to do it. The second is to have a certain impact on the playback quality. The existing 31-band equalizer has a bandwidth of 1/3 octave, and some of the acoustic feedback needs to be attenuated. The bandwidth is sometimes far less than 1/3 octave. At this point, many useful frequency components are removed, causing irreparable damage to these frequency sounds. Third, it is possible to burn equipment during the adjustment process. It takes a certain time to judge the howling frequency with the human ear. If this time is too long, the device will be damaged due to the strong signal state for a long time.
The feedback suppressor can completely solve the above problem. The feedback suppressor automatically detects the feedback frequency and accurately attenuates the feedback frequency. Some feedback suppressors can also perform frequency shifting and phase shift processing on the feedback frequency point as needed. Feedback suppression is better. This kind of processing can effectively eliminate the feedback without significantly affecting the playback quality, so its superiority is obvious.
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