Secure audio stream scramble system

Cryptography – Communication system using cryptography – Wireless communication

Reexamination Certificate

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Details

C380S034000, C380S035000, C380S036000, C380S037000, C380S201000, C380S202000, C380S203000, C380S204000, C380S205000, C713S151000, C713S152000

Reexamination Certificate

active

07630492

ABSTRACT:
A process for distributing digital audio sequences according to a nominal flux format including a succession of fields, each of which includes at least one digital block clusterizing a selected number of coefficients corresponding to single audio elements that are digitally coded inside the flux and utilized by audio decoders that are able to play it to be able to decode it correctly, including a preparatory step including modifying at least one of the coefficients, and a transmission step including a primary flux in compliance with a nominal format including blocks that were modified during the preparatory step and by a route separated from the primary flux by an additional piece of digital information which allows reconstruction of the original flux starting with a calculation, on recipient equipment, as a function of the primary flux and of the additional information.

REFERENCES:
patent: 5953506 (1999-09-01), Kalra et al.
patent: 7290057 (2007-10-01), Saunders et al.
patent: 2002/0154774 (2002-10-01), Oomen et al.
patent: 2005/0226408 (2005-10-01), Hotz
patent: 199 07 964 (2000-08-01), None
patent: 0993142 (2000-04-01), None
patent: WO 99/55089 (1999-10-01), None
patent: WO 02/062008 (2002-08-01), None

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