一、概述录音机磁带通过磁头的速度波动,使录音信号产生频率调制,从而引入一个不需要的信号,这个信号就叫做抖动。抖动严重地损害了录音和放音的质量,使语言和音乐发生颤动,并产生很难听的“嗡嗡”声。DD_2抖动测量仪就是测量这个抖动的,它是广播电台、电影机械厂、电影制片厂、录音机厂及录像机厂不可缺少的测量仪器。 I. OVERVIEW The speed of the tape recorder through the head fluctuates to produce a frequency modulation of the recording signal, thus introducing an unwanted signal, which is called jitter. Jitter severely impairs the quality of voice recording and playback, fluttering speech and music, and producing an unpleasant “buzzing” sound. The DD_2 jitter meter measures this jitter and is an indispensable measuring instrument for radio stations, motion picture studios, movie studios, audio recorder factories and video recorder factories.