H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/20, 350/30.5
H04N 7/16 (2006.01) H04H 9/00 (2006.01)
Patent
CA 1208761
ABSTRACT OF THE DISCLOSURE: . A method and a device for identifying television receivers tuned to a certain television channel and displaying the video signal thereof. The method consists in introducing an identification signal in the television signal of the television channel at its source before its transmission towards the television receivers. The nature of the identi- fication signal as well as the way of introducing it in the television signal are both selected so that this identifica- tion signal is irradiated in the air at the television receivers end, when the receivers are tuned to the concerned channel and display the video signal thereof, due to the phenomenom of cathode - ray - tube radiation caused by the presence of high voltages modulated by the luminance informa- tion at the luminance component frequencies. By detecting the identification signal in the proximity of one television receiver, it can be determined that this receiver is tuned to the television channel in question and displays the video signal thereof. When an identification signal is introduced in the television signal of each television channel, it is possible to remotely determine which channel has its video signal displayed on a specific television receiver by identi- fying the channel corresponding to the identification signal detected in the proximity of such a specific receiver. Two very interesting applications of the method and device are as follows: detection of illegal or pirate decoders in a secured television system, such as pay television, and regulating control in areas where television license fees are required by law, such as in France, United Kingdom, Europe, etc..., to differentiate between the use of television receivers with computers or video cassette recorders, and with received broadcast signals.
455985
Cablovision Alma Inc.
Comeau Rene
Robic Robic & Associes/associates
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