三、PAL信号亮、色数字分离。在模/数变换器中,全电视信号数字编码后可直接进行数字处理。但这种方法易造成亮色干扰,特别是对SECAM制式来说,由于色差信号对副载的调制方式是调频,难以采用全电视信号编码,通常采用分量编码并在亮、色信号分离后再进行数字处理。处理后的信号经数字式全电视信号编码, Third, PAL signal bright, color digital separation. In the A / D converter, digital TV signals can be digitally encoded directly. However, this method is easy to cause bright color interference, especially for the SECAM standard, because the color difference signal on the subcarrier modulation is FM, it is difficult to use the full TV signal encoding, usually using component encoding and light, color signal separation Digital processing. The processed signal is encoded by a digital full television signal,