Method and system of controlling the mode of access to signals,

Details Method and system of controlling the mode of access to signals, Method and system of controlling the mode of access to signals,

1995-03-15

1997-04-15

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 10, H04N 7167

Patent

active

056217927

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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