Multichannel television signal scrambling and descrambling syste

Details Multichannel television signal scrambling and descrambling syste Multichannel television signal scrambling and descrambling syste

1994-04-25

1995-07-04

Barron, Jr., Gilberto

Cryptography

Key management

Having particular key generator

380 12, 380 34, H04N 7167

Patent

active

054307996

ABSTRACT:
A multichannel television access control system is disclosed wherein processing of the broadband signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective descrambling of an arbitrary subset of channels in a channel group. The system provides for a closed loop injection signal phasor control so as to maintain substantially constant relationship between the television signals and the injected signals. The combined signals are supplied to subscribers enabling the use of their cable ready equipment.

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Homiller, William T., "Headend Techniques for Reducing Distortion in Distribution Systems," National Cable Television Association Technical Papers, Jun. 12-15, 1983.
Jawad, S. M. et al., "A novel technique for programmed generation of multifrequency composite sinusoids," The Radio and Electronic Engineer, vol. 48, No. 12, pp. 603-611, Dec. 1978.

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