1．引言抖晃(Jitter)概念源于数字通信领域,表征光盘读出信号中相位或频率相对理想时钟的偏离程度。1982年PHILIPS和SONY公司刚开始推行CD光盘时,抖晃参数并没有包含在“红皮书”规格中。直到CD-R引入后,发现有些CD-R光盘在记录读出时,时基稳定性有问题, 1. Introduction The concept of jitter stems from the field of digital communications and characterizes the degree of deviation of phase or frequency relative to an ideal clock in a read signal from a disc. When PHILIPS and SONY started to promote CDs in 1982, the dither parameters were not included in the “Redbook” specification. Until CD-R was introduced, it was found that some CD-R discs had problems with time base stability when they were recorded and read out,