发振器

例句：

1. 1. This device is used to amplify the sound of speech.
   这个装置用来放大语音的声音。
2. 2. The speaker was designed to produce high-quality sound.
   扬声器被设计来产生高质量的声音。
3. 3. The microphone is an essential component of a recording studio.
   麦克风是录音室的一个基本组成部分。