Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-10-19
1987-01-06
George, Keith E.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 1704
Patent
active
046351094
ABSTRACT:
A method and device for remotely identifying TV receivers tuned to a certain TV channel and displaying the video signal thereof. An identification signal is introduced in the television signal of the TV channel at its source before its transmission towards the TV receivers. The nature of the identification signal as well as the way of introducing it in the television signal are both selected so that this identification signal is irradiated in the air at the receivers end when these receivers display the video signal of the concerned channel, due to the phenomenom of cathode--ray--tube radiation caused by the presence of high voltages modulated by the luminance information at the luminance component frequencies. Detection of the irradiated identification signal in the proximity of one receiver indicates that it is tuned to the channel in question and displays the video signal thereof. If a different identification signal is introduced in the television signal of each TV channel, it can be determined which channel has its video signal displayed on a specific receiver by identifying the channel corresponding to the identification signal detected in the proximity of such a specific receiver. The method and device may be used for example to detect pirate decoders in a secured television system.
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Electronics Design, "Electronics Helps Advertisers Keep Track of Their TV Ads," May 27, 1971, pp. 21 & 28.
Cablovision Alma Inc.
George Keith E.
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