| 摘要 |
The signal processor includes a field or frame store (24). If a video signal having a non-standard relationship between its line frequency (fH) and its color subcarrier frequency (fSC) is processed, corresponding signal samples from an analog-to-digital converter (12) of successive fields or frames are misaligned in the store, leading to a degradation of the processed signal. A nonstandard signal detector (22, 19, 23, 21) produces a control signal indicative of the existance of the non-standard relationship and the mode of operation of the processor is controlled accordingly. In one example, field or frame processing and line processing are selectively performed depending on the control signal, line processing being performed in the presence of the non-standard signal. |
