| 摘要 |
<p>A processor for use in synchronising the sampling frequency of an analogue to digital converter (5) to that of an analogue colour television signal to be digitised, comprises a signal processor (12) which is arranged to process signal samples received from the converter (5) during a colour burst of the television signal in order to calculate any phase error, to correct any phase error above a given magnitude by controlling the phase shift provided by a phase shifter (7) connected between the analogue to digital converter and a clock oscillator (6) defining the sampling frequency, and to correct any phase error below a given magnitude by adjusting the frequency of the clock oscillator (6). <IMAGE></p> |
