Method and system of controlling the mode of access to signals, in particular picture signals
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United States of America Patent
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Apr 15, 1997
Grant Date -
N/A
app pub date -
Mar 15, 1995
filing date -
Jul 20, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention concerns a method of controlling the mode of access to wanted signals, such as picture signals (IMAGE), whereby the user selects an access mode to a wanted signal remotely. A first access mode consists in supplying the user with the original wanted signal (IMAGE), and second access mode consists in transmitting to the user alternately and periodically the wanted signal and a jamming signal (MIRE, IT) into a jammed signal. This jammed signal remains intelligible so that the user can determine the content of the wanted signal and, if necessary, select the first access mode. The two access modes are billed differently. Hardware implementations of the method are described for switching grids of switching nodes in a centralized architecture, and for digital distribution networks with a more futuristic distributed type architecture.
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