发明授权
US4987491A Jitter compensation circuit for processing jitter components of
reproduced video signal
失效
用于处理再现视频信号的抖动分量的抖动补偿电路
- 专利标题: Jitter compensation circuit for processing jitter components of reproduced video signal
- 专利标题(中): 用于处理再现视频信号的抖动分量的抖动补偿电路
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申请号: US472982申请日: 1990-01-12
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公开(公告)号: US4987491A公开(公告)日: 1991-01-22
- 发明人: Osamu Kaite , Takahiro Yuchi , Hirotsugu Murashima
- 申请人: Osamu Kaite , Takahiro Yuchi , Hirotsugu Murashima
- 申请人地址: JPX Osaka
- 专利权人: Sanyo Electric Co., Ltd.
- 当前专利权人: Sanyo Electric Co., Ltd.
- 当前专利权人地址: JPX Osaka
- 优先权: JPX1-12712 19890120; JPX1-172461 19890704
- 主分类号: H04N9/89
- IPC分类号: H04N9/89
摘要:
A reproduced video signal of a VTR is applied to a jitter compensation circuit (100). The applied reproduced video signal is A/D converted by a phase modulated clock and after subjected to the adjustment of timing, the signal is written into a memory (4). A burst signal period is specified based on a timing of a horizontal synchronizing signal in the reproduced video signal and a jitter amount is detected based on a sampling phase of the A/D converted burst. Jitter compensation data is calculated based on this jitter amount. On this occasion, latest jitter compensation data is obtained based on the detected jitter amount and the jitter compensation data one horizontal period before. A timing for starting to write the A/D converted video data into the memory is defined based on high-order data of the calculated jitter compensation data, thereby cancelling large jitter components. On the other hand, a phase of a A/D converting clock is controlled based on low-order data of the jitter compensation data, thereby cancelling small jitter components.