| 摘要 |
A system and method are provided for determining the broadcast signal source for the signal being displayed by a video wave receiver, whether tuned by the monitored receiver or an associated tuner device, such as a cable converter or video cassette recorder. The monitoring system includes a probe for detecting a horizontal sweep signal of the monitored receiver. The frequency of the detected horizontal sweep signal is determined and compared to stored characteristic frequency values corresponding to the predetermined channels to which the video receiver may be tuned.
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