动态范围压缩（DRC - dynamic range compression）可以动态调整音频输出幅值，将大音频信号压制在某一范围内，将小音频信号适当提升。通常用于控制音频输出功率，使扬声器不破音，当处于低音量播放时也能清晰听到。

Dynamic range compression (DRC) or simply compression is an electronic effect unit that reduces the volume of loud sounds or amplifies quiet sounds by narrowing or "compressing" an audio signal's dynamic range. Compression is commonly used in sound recording and reproduction, broadcasting, live sound at music concerts and in some instrument amplifiers (usually bass amps).