本文讨论的全数字锁相环包括过零检测器和环路滤波器。

This paper discusses an all digital phase-locked loop with a zero-crossing detector and a loop filter.

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环路为反馈结构，包括插值器、时钟误差检测和环路滤波器三个部分。

The loop is a second order phase lock loop, consisting of an interpolator, a timing error detector and a loop filter.

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然后分析了现有视频解码系统和环路滤波器设计，并且指出了本设计的重点和难点以及解决的思路。

The commonly used techniques for video systems and loop-filtering are discussed. The author presents a solution and the key points.

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