| 摘要 |
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. 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, 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 color subcarrier signal of the video signal, and a decoding -demodulating device.
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