将彩色电视信号分离后,进行DPCM编码,其合成速率应是行频的倍数为34Mb/s~1,为了能以三次群速率进行传输,要将34Mb/s信息流通过正码速调整提高到34368kb/s。候时抖动是码速调整的固有抖动,为了减小候时抖动並兼顾其它性能,本文设计了码速调整的帧结构,並对候时抖动进行了频谱分析。 The color television signal separation, the DPCM coding, the synthesis rate should be multiples of the line rate of 34Mb / s ~ 1, in order to be able to three group rate transmission, to 34Mb / s information flow through the positive code speed adjustment to 34368kb / s. When the jitter is the inherent jitter of the code rate adjustment, in order to reduce the jitter and accommodate other performance, this paper designs the frame structure of the code rate adjustment, and carries out the spectrum analysis of the jitter.