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我们有时在开大会时,传声器前发言人的讲话会激起扬声器阵阵令人难以忍受的“嗡”声或“啸”声或“吱”声。其实这并非传声器(如话筒)、扩音机、扬声器(如音箱)有什么故障。主要是由于传声器与扬声器的相对位置不合理(如位置相对太近),使得整个扩音系统对语言中的某个音频成分发生自激所致。自激的条件是,扩音声中的某个频率成分传到传声器的声压大
Sometimes when we open a conference, the speaker’s presenter’s speech provokes an unpleasant “Om” or “whistling” or “squeaky” sound. In fact, this is not a microphone (such as a microphone), amplifiers, speakers (such as speakers) What is the fault. Mainly due to the relative position of the microphone and the speaker unreasonable (such as the location is too close), making the whole PA system of language in an audio component self-excited. The condition of self-excitation is that the sound pressure transmitted by a certain frequency component of the sound reinforcement to the microphone is large