发明名称 |
Sync separator with periodic updating |
摘要 |
A sync separator detects the occurrence of a corresponding sync pulse in a corresponding part of the waveform of a composite video signal. The level of the sync tip is used for updating a slice level signal, provided the level of the sync tip is lower than that of the preceding sync tip signal. A time-out signal is generated at the end of a time-out interval that has elapsed from the last time the sync tip signal was updated, provided the sync tip signal was not updated within such time-out interval. The time-out signal is used for updating the sync tip signal. The sync tip signal is updated according to such sync pulse that occurred during the time-out interval, having the lowest level sync tip. Information obtained from the sync tip and back porch portions of the corresponding sync pulse is used for generating a slice level signal. A comparator responsive to the slice level signal separates a sync signal from the composite video signal.
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申请公布号 |
US4697211(A) |
申请公布日期 |
1987.09.29 |
申请号 |
US19860857320 |
申请日期 |
1986.04.30 |
申请人 |
RCA CORPORATION |
发明人 |
BALABAN, ALVIN R.;STECKLER, STEVEN A. |
分类号 |
H04N5/08;(IPC1-7):H04N5/08;H04N5/10 |
主分类号 |
H04N5/08 |
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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