The feedback suppressor is a device that automatically suppresses the whistle of the microphone. When the microphone whistle, it immediately finds and calculates its frequency and attenuation, and executes a command to suppress the acoustic feedback according to the calculation result, also called a microphone. The howling suppressor is necessary equipment for places such as KTV. The feedback suppressor eliminates the method of returning the howling while maintaining sufficient volume and good sound quality. Good sound reinforcement systems are essential for meetings, performances, presentations, presentations, and many other occasions. In practical applications, we often encounter problems like this, in which the howling caused by feedback is the most common and most troublesome. Not only is it harsh, but it can be a huge hazard to speakers and even amplifier systems.
In the early days, segmentation equalizer (EQ) was often used as an acoustic feedback suppression device. Since the EQ filter is fixed and immutable, it cannot be accurately positioned to the feedback point. In addition, due to the wide bandwidth of the EQ filter, the depth of the notch is deep, and a lot of sound power will be lost during use. The emergence of feedback suppressors overcomes many of the deficiencies of equalizers as acoustic feedback suppression devices. Compared with the segmented graphic equalizer, it has three major advantages: firstly, it has an automatic function. After setting it, it does not need to be manually adjusted by the sound engineer; secondly, it can automatically search and accurately locate the feedback frequency; the third and most important The advantage is that the feedback suppressor's macro filter does not have to be made deep or wide, it is ten times smaller than the multi-segment EQ filter, which means that the sound engineer can push the system gain more high without guaranteeing howling.
When we understand the performance characteristics of the feedback suppressor, we will look at the feedback suppressor connection method in the professional audio knowledge. The feedback suppressor also uses the balanced line of the XLR connector or the balanced line of the TRS connector in terms of device connection, so his connection can be roughly divided into the following three types:
First: Just like the peripherals and other peripheral devices connected in series in the sound system, knowing his connection method, we next look at the advantages of this connection: connection and operation is very simple, suitable for simpler systems. However, there are also disadvantages. The disadvantage is that this connection method also affects other source signals passing through the feedback suppressor when suppressing the microphone sound feedback.
Second: You can also use the INS in the mixer channel to insert the plug-in interface, and connect the feedback suppressor separately in the corresponding channel. The advantage of this connection is that the feedback suppressor can be adjusted to the maximum extent without regard to the adjustment. However, its disadvantage is that with this connection method, a feedback suppressor can only control up to 2 channels of the mixer, and the device utilization is too low.
Thirdly, the INS insertion and insertion interface in the mixer group is used to connect the feedback suppressor in the corresponding grouping channel. The advantage of this connection mode is that the microphones programmed into the group can be processed centrally. And it will not affect other sources. In summary, because this method can make full use of the feedback suppressor, it is also the most widely used connection method.
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