Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-04-22
1995-10-17
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 10, 380 17, H04N 7167
Patent
active
054597897
ABSTRACT:
Apparatus for selecting predetermined ones of packets of signal components, from a signal stream of packets includes a control device, responsive to user selection and a transmitted program guide, for determining packet identifier codes, SCID's, for respective program signal components. The respective component SCID's are stored in progrommable registers. SCID's, from respective packets in the signal stream, are successively loaded into a further register. Comparators which are associated with the programmable registers, compare the stored SCID's with the SCID's from packets in the signal stream. Output signals from the respective comparators control the utilization of the respective signal component packets in the signal stream. Programming of SCID's in the respective programmable registers is performed according to a schedule to preclude undesired data inadvertently being accepted by the system.
REFERENCES:
patent: 5168356 (1992-12-01), Acampora et al.
patent: 5233654 (1993-08-01), Harvey et al.
patent: 5289276 (1994-02-01), Siracusa et al.
patent: 5347635 (1994-09-01), Voeten et al.
Deiss Michael S.
Tamer Gregory G.
Cain David C.
Herrmann Eric P.
Kurdyla Ronald H.
Thomson Consumer Electronics
Tripoli Joseph S.
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