Weak current College】 【screech of active suppression and comparison of passive restraint --- Power By】 【China power house network.

In sound reinforcement system feedback of excessive performance is Whistler, is the microphone audio gain elevation limit performance, is the result of peak overlay. In response to this phenomenon, it proposed a variety of enhanced microphone audio gain methods such as reasonable sound field layout, additional sound absorbing materials, changing sound reflection characteristics and so on physical means to avoid this kind of phenomenon from occurring, meet the functional needs of sound reinforcement of sound pressure. This will not repeat them.
Through electroacoustic device compensation means to achieve improved microphone audio gain goal is also often used. Electroacoustic device compensation means also divided into active mode and passive mode.

Shift is a typical active suppression tool, how it works is the audio signal through the shift change in original frequency characteristics (incoming signal is 1khz, out of the signal is 995hz) and thus destroyed the peak overlay, so that the frequency response curve tends to flat sound reinforcement system get higher average audio gain microphone margin space to ensure that the initiative of the whistle.

Equalizer for feedback control first is found high frequency response curve, through the bumps on the point of control is to be balanced frequency response curve, making sound reinforcement system for maximum audio gain space (2-6db). Feedback suppressor works is an automatic equalizer. So said the equalizer and feedback suppressor for live sound reinforcement environment belong to passive feedback inhibition.

L audio microphone gain enhancement processor built two feedback inhibition, a pressure point (parametric equalization), second shift. Is ascending tone microphone gain enhancement processor in KTV, conferences, and other environments can be used by very positive recognition, there are two reasons.

One is in the current environment for sound reinforcement feedback suppressor in the l sound microphone gain enhancement processor is the most complete, additional control measures to not mention. It has proactively inhibits (shift) and passive restraint (parametric equalization) means.

When the access is most of the environment without debugging you can easily reach the singing, speech, the purpose of the prevention of Whistler. The system's audio gain new skills, the l sound microphone gain upgrade the processor to raise 3-8db. While traditional feedback suppressor can only raise 2-6db and complex debugging.

Normal singing of tone: microphone gain enhancement processor almost no aural distortion. General feedback suppressor in automatic mode pressure point range constant-9db bound to create great sound distortion. For reasons of speed, a lot of feedback suppressor produces sound lag phenomena.

The second is the interface problems, regular feedback suppressor only line interface, many card package amplifier does not have the phone line access point. To give feedback suppression processing start, which caused a general feedback suppressor is not available in this type of environment.

The third is the regular feedback suppressor is a passive is the feedback suppressor, in sound reinforcement State microphone location changes bring microphones, sound phase change lift, how it is changing along with it. General feedback suppressor in the microphone location often become environment is obviously not a good idea.

Sound lag and automatic State pressure point range constant-9db will cause great auditory distortion sounds serious and rear. This is a regular feedback suppressor cannot be used for this type of environment of the bane.

Fourth, the use of l-sound microphone gain enhancement processor Panel feedback inhibition of intuitive and multiplayer menu complex processor calls to more directly.