| 摘要 |
<p>The invention relates to a digital multistandard decoder for composite video signals. The multistandard decoder according to the invention can selectively process NTSC or PAL video signals and there is no need to know the corresponding signal standard beforehand. It comprises a sample rate converter, which converts the sample values of the video signals digitized with a first predetermined clock frequency into video signal sample values of a second virtual sampling frequency, has a phase-locked loop for controlling the sample rate converter, which incorporates a sync detector, in order to determine the line sync pulse and set the virtual sampling frequency to an integer multiple of the line frequency of the video signal, and a burst detector in order to set the virtual sampling frequency synchronously with the phase of the colour subcarrier signal of the video signal, and a decoding - demodulating device for the recovery of the luminance and chrominance signal components from the video signal sample values of the virtual sampling frequency. <MATH></p> |
