CN102667921B

5G,4G,3G

Title

AUDIO ENCODER AUDIO DECODER METHOD FOR ENCODING AN AUDIO INFORMATION METHOD FOR DECODING AN AUDIO INFORMATION AND COMPUTER PROGRAM USING AN ITERATIVE INTERVAL SIZE REDUCTION

Application Number:

CN2010858335

Publication Date:

10-09-2014

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 AN ITERATIVE INTERVAL SIZE REDUCTION

Application Number:

CN2010858335

Family ID:

43259832

Publication Country:

US

Publication Date:

10-09-2014

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 information is used based on the coded audio information to provide decoded audio decoder (2200) which comprises an arithmetic decoder (2200) for through arithmetic coding based on representing spectral coefficients of (2222) providing a plurality of the decoded spectral values (2224). The audio decoder also comprises a frequency-domain to time-domain converter (2230) for using the decoded spectral values (2224) providing a time-domain audio representation to provide the decoded audio information (2212). the arithmetic decoder is configured to describe the current context state of numerical type current context and the selected description to the symbol code value mapping rule. the arithmetic decoder is configured to previously decoded spectral values determined context value based on multiple numerical type present. the arithmetic decoder is configured to evaluate at least one table is using an iterative interval size reduction to determine the numerical value type at present whether the context value described by a log item of the table of table context values are the same or an interval described login item located by the table and a mapping rule index value of the mapping table derived description selected. audio encoder also uses an iterative interval table size reduction.

An audio decoder (2200) for providing a decoded audio information on the basis of an encoded audio information comprises an arithmetic decoder (2200) for providing a plurality of decoded spectral values (2224) on the basis of an arithmetically-encoded representation (2222) of the spectral coefficients. The audio decoder also comprises a frequency-domain-to-time-domain converter (2230) for providing a time-domain audio representation using the decoded spectral values (2224) in order to obtain the decoded audio information (2212). The arithmetic decoder is configured to select a mapping rule describing a mapping of a code value onto a symbol code in dependence on a numeric current context value describing a current context state. The arithmetic decoder is configured to determine the numeric current context value in dependence on a plurality of previously decoded spectral values. The arithmetic decoder is configured to evaluate at least one table using an iterative interval size reduction to determine whether the numeric current context value is identical to a table context value described by an entry of the table or lies within an interval described by entries of the table and to derive a mapping rule index value describing a selected mapping table. An audio encoder also uses an iterative interval table size reduction.

An audio decoder (2200) for providing a decoded audio information on the basis of an encoded audio information comprises an arithmetic decoder (2200) for providing a plurality of decoded spectral values (2224) on the basis of an arithmetically-encoded representation (2222) of the spectral coefficients. The audio decoder also comprises a frequency-domain-to-time-domain converter (2230) for providing a time-domain audio representation using the decoded spectral values (2224) in order to obtain the decoded audio information (2212). The arithmetic decoder is configured to select a mapping rule describing a mapping of a code value onto a symbol code in dependence on a numeric current context value describing a current context state. The arithmetic decoder is configured to determine the numeric current context value in dependence on a plurality of previously decoded spectral values. The arithmetic decoder is configured to evaluate at least one table using an iterative interval size reduction to determine whether the numeric current context value is identical to a table context value described by an entry of the table or lies within an interval described by entries of the table and to derive a mapping rule index value describing a selected mapping table. An audio encoder also uses an iterative interval table size reduction.

Note:

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