Digital Processing of Composite Color Signals. Separation into Components and Reconstitution without Loss of Quality.

While extending the existing television studios for fully digital operation, use will be made of numerous items of equipment that carry out digital processing and have PAL composite color signals at their input and output. The fact that demodulation and remodulation of the chrominance subcarrier are necessary, would normally lead to expect some deterioration in the signal quality; this would be particularly serious when several items of equipment involving PAL demodulation and remodulation are connnected in cascade. The article describes a method whereby it is possible to avoid such a reduction of signal quality. The method may be applied also for NTSC and SECAM composite color signals.