Cryptography – Key management – Having particular key generator
Patent
1994-10-12
1997-04-01
Tarcza, Thomas H.
Cryptography
Key management
Having particular key generator
380 6, 380 7, 380 8, 380 19, 380 20, 380 50, H04K 102, H04N 7117, H04L 900
Patent
active
056174764
ABSTRACT:
A scrambling system has a scrambling apparatus and a descrambling apparatus for scrambling and descrambling a digital audio signal having a plurality of 16-bit long sample data units. The scrambling apparatus has a detector for detecting, in each sample data unit, a meaningless portion which is a portion including the MSB and a meaningful portion which is a portion including the LSB, and applying scrambling only to the meaningful portion. Since the meaningless portion is not scrambled, no error data will appear in the meaningless portion. Thus, an unexpected abrupt change in sound caused by a bit error in the meaningless portion which has bits with greater weighted value can be avoided.
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"Coding for Moving Pictures and Associated Audio for Digital Storage Media at up to about 1.5 MBIT/s", CD 11172-3, Jun. 11, 1992.
Ibaraki Susumu
Katta Noboru
Murakami Hiroki
Nakamura Seiji
Matsushita Electric - Industrial Co., Ltd.
Sayadian Hrayr A.
Tarcza Thomas H.
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