Digital signal broadcasting

Details Digital signal broadcasting Digital signal broadcasting

1996-07-25

1998-07-28

Nguyen, Chau

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370399, 348423, H04N 7173, H04L 1256

Patent

active

057870896

ABSTRACT:
A distribution network groups television program signals into service tiers. To provide these from unsynchronized MPEG streams without resynchronization, each stream, representing a single program signal is encapsulated into ATM cells with a virtual path (VP) identification of each ATM cell corresponding to the service tier and a virtual channel (VC) identification corresponding to the respective program signal. Payloads in cells having the same VP are scrambled using a scrambling key allocated to that VP and hence to the corresponding service tier, and are unscrambled by entitled subscribers using the scrambling key which is supplied to them individually using public/private encryption techniques.

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patent: 5420866 (1995-05-01), Wasilewski
patent: 5473696 (1995-12-01), Van Breemen et al.
patent: 5513178 (1996-04-01), Tanaka
patent: 5592554 (1997-01-01), Moehrmann
patent: 5627836 (1997-05-01), Conoscenti et al.

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