Data extracting apparatus for validating data multiplexed in...

Details Data extracting apparatus for validating data multiplexed in... Data extracting apparatus for validating data multiplexed in...

H - Electricity

04

N

H04N 7/087 (2006.01) H04N 7/035 (2006.01) H03L 7/095 (2006.01)

Patent

CA 2153214

A data extracting apparatus for validating data multiplexed to a predetermined interval of a video signal includes a PLL circuit 5 generating a sampling clock locked with a sync signal in a video signal, and a sampling circuit 4 for sampling the video signal in time with sampling clock. A lock flag indicating whether the generated sampling clock is correctly synchronized with the sync signal or not is also generated. The data multiplexed to the sync signal is sampled by the above sampling clock. The data is stored in a memory 7. The lock flag is supplied to a controller 2 and the data that is outputted from the memory 7 is made valid or invalid according to the level of the lock flag. According to the invention, only the data sampled by a correct sampling clock is data processed.

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