Cryptography – Communication system using cryptography – Having compression
Reexamination Certificate
2006-01-10
2006-01-10
Revak, Christopher (Department: 2131)
Cryptography
Communication system using cryptography
Having compression
C380S236000, C382S250000
Reexamination Certificate
active
06985590
ABSTRACT:
The present invention provides a method and a system with which information embedded in compressed digital audio data can be directly operated. An embodiment of the system for embedding additional information in compressed audio data includes: means for extracting MDCT (Modified Discrete Cosine Transform) coefficients from the compressed audio data; means for employing the MDCT coefficients to calculate a frequency component for the compressed audio data; means for embedding additional information in the frequency component obtained in a frequency domain; means for transforming into MDCT coefficients the frequency component in which the additional information is embedded; and means for using the MDCT coefficients, in which the additional information is embedded, to generate compressed audio data.
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Kobayashi Seiji
Shimizu Shuhichi
Tachibana Ryuki
International Business Machines - Corporation
Revak Christopher
LandOfFree
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