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Method and apparatus for processing digitally encoded audio data

A technology for audio data and processing equipment, applied in the field of audio data portable equipment and handheld application equipment

Inactive Publication Date: 2004-08-04
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Unauthorized copying and distribution of digitally encoded data is the most significant problem associated with such players, especially given the growing popularity of such devices and the relative ease with which such data can be downloaded and distributed via the Internet and other sources

Method used

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  • Method and apparatus for processing digitally encoded audio data
  • Method and apparatus for processing digitally encoded audio data
  • Method and apparatus for processing digitally encoded audio data

Examples

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Embodiment Construction

[0015] figure 1 A block diagram of a portable audio device 10 according to the present invention is shown. The arrangement and operation of the various components are described below. However, details of the various components of audio device 10 are well known to those skilled in the art and will not be discussed here. Audio device 10 includes microcontroller 22 that controls the various components and overall operation of audio device 10 , including transferring data from memory card 32 to DSP 12 . Microcontroller 22 includes a suitable amount of memory 23, in this example 48 KB of ROM, which includes various instruction sets, decryption programs, key files and security codes stored thereon for controlling the audio player 10. operate. Suitable microcontrollers include, but are not limited to, the μPC78A4036 manufactured by NEC Corporation.

[0016] Audio device 10 also includes a digital signal processor ("DSP") 12, which may be programmed to perform various signal proce...

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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.

Description

technical field [0001] The present invention relates to apparatus and methods for processing digitally encoded data, and more particularly to portable apparatus and methods for processing digitally encoded audio data which has been encoded using a selected one of a number of encoding / decoding formats . The invention is particularly suitable for handheld applications. Background technique [0002] The use of portable audio devices capable of playing digitally encoded data is becoming commonplace. In particular, smaller handheld devices that can process digitally encoded audio data stored on solid-state memory devices are becoming popular. The portable audio devices include those adapted to play audio files that have been encoded or compressed and stored on a memory chip included with the audio player or on a smaller removable memory medium such as a compactflash TM A device that stores digital data on a card. Solid-state memory-based devices are pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/07G10L19/00G11B20/00H04K1/00
CPCG11B20/00086G11B20/0021G11B2220/60H04K1/00G11B20/00115G11B20/00557G11B2020/10546G11B20/00094G11B20/00246G11B20/00253G11B27/105G11B27/34G11B2220/61H04L9/0894G11B20/00217
Inventor 谢承辉蒂伯·西克萨塔老罗伯特·J·迪克
Owner THOMSON LICENSING SA
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