Scrambled transmission system
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United States of America Patent
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Apr 15, 1997
Grant Date -
N/A
app pub date -
Oct 19, 1994
filing date -
Oct 19, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A scrambled transmission system for transmitting a digital data containing variable length coding conforming to a MPEG standard includes a scramble key generator for generating a scramble key at a timing of each GOP head. A GOP head detector detects each GOP head and causes the scramble key generator to refresh the scramble key. A seed generator generates a scramble seed based on said scramble key at a timing of each slice head. A slice head detector detects each slice head and causes the seed generator to refresh the scramble seed. A random number generator scrambles the digital data based on the scramble seed. A multiplexer embeds the scramble key in the extension.sub.-- and.sub.-- user.sub.-- data of the scrambled data.
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