发明名称 |
Automatic gain control circuitry |
摘要 |
To provide an automatic gain control circuitry which effectively works for a video signal of which pedestal level in an effective video period is different from the pedestal level in the vertical blanking period. The automatic gain control circuitry comprises a first pedestal level detection part to detect a synchronizing level in the vertical blanking period of the video signal, a second pedestal level detection part to detect a synchronizing level in an effective video period of the video signal, and a ratio determination part to determine a ratio between the value detected by the first pedestal level detection part and the value detected by the second pedestal level detection part and multiplying the ratio to a standard value of the synchronizing value in the vertical blanking period for outputting the obtained value as the reference synchronizing level.
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申请公布号 |
US2005185100(A1) |
申请公布日期 |
2005.08.25 |
申请号 |
US20040014817 |
申请日期 |
2004.12.20 |
申请人 |
OKI ELECTRIC INDUSTRY CO., LTD. |
发明人 |
AKIYAMA TAKAAKI |
分类号 |
H04N5/52;(IPC1-7):H04N5/52 |
主分类号 |
H04N5/52 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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