CN102667922A

5G,4G,3G

Title

AUDIO ENCODER AUDIO DECODER METHOD FOR ENCODING AN AUDIO INFORMATION METHOD FOR DECODING AN AUDIO INFORMATION AND COMPUTER PROGRAM USING A DETECTION OF A GROUP OF PREVIOUSLY-DECODED SPECTRAL VALUES

Application Number:

CN2010858338

Publication Date:

12-09-2012

Current Assignee:

FRAUNHOFER SOCIETY

Family ID:

43259832

Application Date:

19-10-2010

Declaring Company:

FRAUNHOFER SOCIETY

Publication Country:

US

Priority Date:

20-10-2009

View on Espacenet goto-link

Title

AUDIO ENCODER AUDIO DECODER METHOD FOR ENCODING AN AUDIO INFORMATION METHOD FOR DECODING AN AUDIO INFORMATION AND COMPUTER PROGRAM USING A DETECTION OF A GROUP OF PREVIOUSLY-DECODED SPECTRAL VALUES

Application Number:

CN2010858338

Family ID:

43259832

Publication Country:

US

Publication Date:

12-09-2012

Application Date:

19-10-2010

Priority Date:

20-10-2009

Current Assignee:

FRAUNHOFER SOCIETY

Declaring Company:

FRAUNHOFER SOCIETY

View on Espacenet goto-link

Abstract  Abstract

An audio decoder (200) is used based on the coded audio information (210) and provides the decoded audio information (212) comprises based arithmetic encoded spectral value representation (222) providing a plurality of decoded spectral values (232) an arithmetic decoder (230) and to use these decoded spectral values and providing a time-domain audio representation (262) to obtain the decoded audio information of a frequency-domain to time-domain converter. the arithmetic decoder (230) is configured according to context state and selects a mapping rule describing the value mapped to the symbol code. the arithmetic decoder is configured is based on a plurality of previously decoded spectral values and determining or modifying the current context state. the arithmetic decoder is configured to detecting a group of a plurality of previously decoded spectral values the spectral values are individually or collectively to satisfy the predetermined condition of its amplitude and according to the detection result to determine the current context state. An audio encoder uses similar principles.

An audio decoder (200) for providing a decoded audio information (212) on the basis of an encoded audio information (210) comprises a arithmetic decoder (230) for providing a plurality of decoded spectral values (232) on the basis of an arithmetically-encoded representation (222) of the spectral values and a frequency-domain-to-time-domain converter (260) for providing a time-domain audio representation (262) using the decoded spectral values in order to obtain the decoded audio information. The arithmetic decoder (230) is configured to select a mapping rule describing a mapping of a code value onto a symbol code in dependence on a context state. The arithmetic decoder is configured to determine or modify the current context state in dependence on a plurality of previously-decoded spectral values. The arithmetic decoder is configured to detect a group of a plurality of previously-decoded spectral values which fulfill individually or taken together a predetermined condition regarding their magnitudes and to determine the current context state in dependence on a result of the detection. An audio encoder uses similar principles.

Note:

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