Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion
Reexamination Certificate
2006-07-11
2006-07-11
McFadden, Susan (Department: 2655)
Data processing: speech signal processing, linguistics, language
Audio signal bandwidth compression or expansion
C380S201000, C380S200000, C713S176000
Reexamination Certificate
active
07076432
ABSTRACT:
An apparatus and a method for processing encoded digital audio data, wherein the digital audio data is encoded using one of a plurality of encoding formats. The present invention prevents encoded digital audio data that has been copied onto a particular type of data storage medium having a unique identifier, such as a compactflash memory card, from another one of the particular type of data storage medium from being playable in an audio playback device according to the present invention. In accordance with the present invention, an encoded audio data file is encrypted using a unique identifier associated with the data storage device and a second key, an associated decoder file is encrypted using a first key, and the encrypted data and decoder files are stored onto the data storage device. During playback, a digital signal processor decrypt the audio data file in response to the second key and decrypts the decoder file in response to the first key. Advantageously, the second key is generated in response to the unique identifier and a third key. This method of encrypting and playing back the audio data files stored in the data storage device prevents an apparatus according to the present invention from playing back audio data files from a particular type of data storage device having a unique identifier, when the audio data files have been copied from another one of the same type of data storage device.
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Cheah Sin Hui
Csicsatka Tibor G.
Dick, Sr. Robert James
Kiel Paul P.
McFadden Susan
Shedd Robert D.
Thomson Licensing S.A.
Tripoli Joseph S.
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