| 摘要 |
Apparatus for automatically turning off any device, as for example a television receiver, upon the discontinuance of a certain signal component for a preselected period of time. The automatic shut-off feature is incorporated into a conventional television receiver without in any way affecting the normal operation of the television receiver until the station to which the set is tuned, leaves the air. When a station leaves the air, this will be sensed as a loss of a signal component, as for example, the synchronizing signal and automatically thereafter there will be energized a timer mechanism which is effective after a preselected period of time to shut off the television set; but, without in any way interfering with a subsequent turning on of the set by a viewer to a selected television broadcast when the station has resumed broadcasting. The invention is particularly useful where television sets are installed in bedrooms and the televiewer falls asleep, allowing the television set to stay on after the television station has ceased broadcasting.
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