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Presentation
Broadband Television Scrambling And Descrambling System
U.S. Pat. No. 5,864,621, January 26,
(1999)
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.
Publication Date
January 26, 1999
Citation Information
Ron D. Katznelson. "Broadband Television Scrambling And Descrambling System", U.S. Pat. No. 5,864,621, January 26, (1999).
Available at: http://works.bepress.com/rkatznelson/27