sound envelope

例句：

1. 1. The sound envelope is a crucial part of the recording process.
   声音包覆是录音过程中至关重要的一部分。
2. 2. The sound envelope was designed to enhance the clarity of the audio signal.
   声音包覆被设计用来增强音频信号的清晰度。
3. 3. The sound envelope is used to control the volume and balance of the audio signal.
   声音包覆用于控制音频信号的音量和平衡。