In sound recording,a low frequency noise usually produced by regular variations in the speed of a system's mechanical component. 录音技术中的一种低频噪声，通常由于系统机械部件的速度有规律变化而引起。
In recording, a feature of some tape recorders that permits the tape movement to be stopped without switching from the play or record settings. 在录音技术中，某些磁带录音机具有的一种特殊功能，它不需从放音或录音设定位置作切换就可使磁带停止运动。
