话筒作为声音的输出设备,在整个校园音响扩声系统中有着非常重要的作用。选择和使用好无线话筒,会给教学活动带来极大的便利。现在中小学校相继配备了无线话筒,有些电教员对如何选择和使用无线话筒方面的知识掌握较少,以至于在购置时受骗上当,使用时达不到应有的音响效果。相对说来,无线话筒比有线话筒在价格上昂贵 Microphone as a sound output device, the campus sound reinforcement system has a very important role. Choosing and using wireless microphones will bring great convenience to teaching activities. Now primary and secondary schools are equipped with wireless microphones one after another, and some electric trainers have little knowledge of how to select and use wireless microphones, so that they are fooled into deception when purchased and can not reach the required sound effects when using them. In contrast, wireless microphones are more expensive than wired microphones