Compression coding device with scrambling function and expansion

Details Compression coding device with scrambling function and expansion Compression coding device with scrambling function and expansion

1997-03-28

1999-03-23

Cain, David

Cryptography

Key management

Having particular key generator

380 9, 380 49, H04N 7167

Patent

active

058870610

ABSTRACT:
In a compression coding device having a scrambling function, a variable length coder outputs coded image data. When the image data are to be written to a memory included in a multiplexer, a controller generates a control signal for writing the image data in the order of the positions of slices constituting a single picture, and feeds it to the memory. When the image data should be scrambled on the basis of a preselected scrambling system, the controller outputs a control signal for reading the image data out of the memory in a different order with respect to the positions of slices, and feeds it to the memory. The multiplexer multiplexes the image data in a preselected position of an MPEG (Moving Picture Experts Group) 2 output data format. Further, the controller outputs information representative of the positions of the slices occurred before and after the scrambling, and causes the multiplexer to multiplex them in another preselected position of the MPEG2 output data format. An expansion reproducing device having a descrambling function is also disclosed.

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patent: 5208857 (1993-05-01), Lebrat
patent: 5319707 (1994-06-01), Wasilewski et al.
patent: 5553141 (1996-09-01), Lowry et al.
patent: 5555305 (1996-09-01), Robinson et al.

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