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在很多文艺演出中都出现过扩音系统啸叫的情况,出现这种情况的原因是声源除了在正常的通道内传输之外,还出现了舞台音箱回授到传声器内的反馈通道,反馈声音再通过传声器把声音送至扩大系统,最终回到音箱。声源的正向传输通道有以下几个:一是传声器,二是放大系统,三是音箱。如果舞台声源反复循环,声音不断加大,放大系统就会自激,声源系统就会出现故障。因此,在文艺演出开始之前,工作人员就需要结合演出需求合理的制定消除声反馈方案,避免出现声反馈问题。
In many art performances have appeared PA system whistling situation, this situation occurs because the sound source in addition to transmission within the normal channel, there is also a stage speaker feedback to the microphone feedback channel, the feedback The sound is then sent through the microphone to expand the system, and finally back to the speaker. The source of the positive transmission channel has the following: First, the microphone, the second is to enlarge the system, the third speaker. If the stage sound source repeatedly cycles, the sound continues to increase, zoom in system will self-excited, the sound source system will fail. Therefore, before the performance of theatrical performance, staff members need to work out reasonable requirements to eliminate the acoustic feedback program to avoid acoustic feedback problems.