Cryptography – Electric signal masking
Reexamination Certificate
2007-02-13
2007-02-13
Moazzami, Nasser (Department: 2131)
Cryptography
Electric signal masking
C380S200000, C382S200000
Reexamination Certificate
active
10000700
ABSTRACT:
The present invention provides a system and method for introducing white noises into a digital audio signal so that there is progressive and cumulative degradation in audio quality after each successive reproduction of the audio sound signal in a fashion analogous to analog audio reproduction. The invention provides a white noise generator, and a digital entroping unit. In a preferred embodiment, the white noise generator is implemented by a hardware random number generator. The digital entroping unit controls the magnitude of white noise desired based on a random number generated by the random number generator, and adds the white noise to the input audio sound signal to produce a degraded audio sound signal. The magnitude of white noise can be controlled by using various masking and formatting of random number data.
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Moazzami Nasser
Pillsbury Winthrop Shaw & Pittman LLP
Portalplayer, Inc.
Sherkat Arezoo
LandOfFree
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