Data processor for FM multiplex broadcast

Details Data processor for FM multiplex broadcast Data processor for FM multiplex broadcast

1997-05-12

2000-10-03

Cangialosi, Salvatore

Cryptography

Communication system using cryptography

Pseudo-random sequence scrambling

380270, H04L 900

Patent

active

061283908

ABSTRACT:
A second random number generator (102) sets a scramble key data included in a transmitted/received data to an initial value, and it generates predetermined second random numbers. A first random number generator (101) generates first random numbers from the second random numbers supplied by the second random number generator (102). The generation of the first random numbers by the first random number generator (101) is controlled by an output from a first control circuit (103). Since the output from the first control circuit (103) is changed in accordance with a service identification code SI, the first random numbers generated from the first random number generator (101) are changed. The first random numbers are input to a gate circuit (105) via a second control circuit (104). The second control circuit (104) inhibits the output of the first random numbers in accordance with the SI value. In such a manner, scrambling or descrambling is controlled in the gate circuit (105).

REFERENCES:
patent: 4811394 (1989-03-01), Ragavan et al.
patent: 5740246 (1998-04-01), Saito
patent: 5784462 (1998-07-01), Tomida et al.
patent: 5825888 (1998-10-01), Kimura et al.
patent: 5835499 (1998-11-01), Kimura et al.
patent: 5912973 (1999-06-01), Hiramatsu et al.

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