| 发明名称 |
PAL video signal processing apparatus. |
| 摘要 |
<p>Signal processing apparatus comprises a chrominance subsampler (10) for sampling the U and V components of a PAL video signal in response to an enable signal. A counter (30) responsive to the horizontal synchronisation component of the PAL video signal generates the enable signal upon detection of a predetermined number of horizontal synchronisation pulses. Logic (60,70,80) responsive to the vertical synchronisation component of the PAL video signal resets and disables the counter (30) upon detection of a vertical synchronisation pulse. Logic (50,60,70,80) restarts the counter (30) from a reset state upon detection of a predetermined polarity in the V component of the PAL video signal <IMAGE></p> |
| 申请公布号 |
EP0568743(A1) |
申请公布日期 |
1993.11.10 |
| 申请号 |
EP19920304175 |
申请日期 |
1992.05.08 |
| 申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
SMITH, PETER MARTIN;CONWAY-JONES, DAVID CHARLES;BROWN, DAVID JOHN;KIM, JONG-HAN |
| 分类号 |
H04N9/64;(IPC1-7):H04N9/64 |
主分类号 |
H04N9/64 |
| 代理机构 |
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