发明名称 |
TELEVISION VIDEO SYNCHRONIZATION SIGNAL MONITORING SYSTEM AND METHOD FOR CABLE TELEVISION SYSTEM |
摘要 |
Each television in a cable system has a multi-standard receiver (120) for receiving signals in predefined formats, each employing a hidden coupling convertor (104). Each television includes a raster scan CRT and control circuitry (112) that controls the sweep pattern generated by the CRT, and which control circuitry includes an h sync circuit that synchronizes each sweep of the CRT electron beams with an h sync signal in the received signal, and generates a distinctive voltage at the beginning of each sweep of the CRT. A filter internal to the convertor extracts the h sync component of the TV signal on a user-selected channel. A comparator compares the extracted h sync with any signals received from an external antenna, the resultant signal indicating whether the TV is both turned on and tuned to the selected channel.
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申请公布号 |
WO9502943(A1) |
申请公布日期 |
1995.01.26 |
申请号 |
WO1994US07312 |
申请日期 |
1994.06.28 |
申请人 |
PACIFIC PAY VIDEO LIMITED |
发明人 |
YAZOLINO, LAUREN, F.;GOODELL, JOHN, L. |
分类号 |
H04H60/32;H04H60/43;H04N5/445;H04N5/46;H04N7/10;H04N7/16;(IPC1-7):H04N7/10;H04N17/00 |
主分类号 |
H04H60/32 |
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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