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本文提出一种用于ＰＡＬ电视信号Ｙ·Ｃ分离的新的三维滤波器的结构。该三维滤波器由一个一维水平滤波器和一个二维垂直－时间滤波器组成。其中二维滤波器通过频域座标适当旋转，可以沿二个新座标轴分解成二个一维滤波器，这样使二维滤波器的设计和实现均简便。这一新的Ｙ·Ｃ分离方法较已有的方法性能优良，且避免了自适应空间滤波法［１］中画面活动检测的困难。
In this paper, we propose a new three-dimensional filter structure for Y-C PAL signal separation. The three-dimensional filter consists of a one-dimensional horizontal filter and a two-dimensional vertical-time filter. The two-dimensional filter rotates properly in the frequency domain and can be decomposed into two one-dimensional filters along two new axes, which makes the design and realization of two-dimensional filters easy. The new Y · C separation method has better performance than the existing methods and avoids the difficulty of detecting the picture activity in the adaptive spatial filtering method [1].