Scrambled signal receiver

Details Scrambled signal receiver Scrambled signal receiver

1986-11-25

1989-03-28

Cangialosi, Salvatore

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 21, H04L 904

Patent

active

048171433

ABSTRACT:
A system including a receiver which receives scrambled signals and subjects them to a descrambling process under the control of control words periodically conveyed to the receiver by a conditional access sub-system. A new control word is required for every 256 television frames constituting a descrambling period, which control word is transmitted during the preceding descrambling period. In order to reduce the time taken to initiate the descrambling process upon selection of a particular service or following an interruption therein, the initial control word then conveyed to the receiver is that for the 256 frame descrambling period following the existing descrambling period. The initial control word is followed by the control word for the existing descrambling period. Subsequent control words are successively conveyed to the receiver during the descrambling intervals preceding those to which such control words are respectively applicable.

REFERENCES:
patent: 4322745 (1982-03-01), Saeki et al.
patent: 4475123 (1984-10-01), Dumbauld et al.
patent: 4484027 (1984-11-01), Lee et al.
patent: 4531021 (1985-07-01), Bluestein et al.
patent: 4600942 (1986-07-01), Field et al.
patent: 4613901 (1986-09-01), Gilhousen et al.
patent: 4635113 (1987-01-01), Okada et al.
patent: 4636851 (1987-01-01), Brury et al.
patent: 4646147 (1987-02-01), Kruger
patent: 4682360 (1987-07-01), Fredriksen
patent: 4691352 (1987-09-01), Arrugon et al.
patent: 4694491 (1987-09-01), Horne et al.
patent: 4723283 (1988-02-01), Nasagawa et al.
patent: 4731840 (1988-03-01), Mniszewski et al.
patent: 4736422 (1988-04-01), Mason

Affiliated with

Also associated with

Rating

Scrambled signal receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Scrambled signal receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scrambled signal receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1666050