Patent ID: 8612240
Filing Date: 2013-12-17
Classification: G10L

Abstract:
1. An audio decoder for providing a decoded audio information on the basis of an encoded audio information, the audio decoder comprising: an arithmetic decoder for providing a plurality of decoded spectral values on the basis of an arithmetically-encoded representation of the spectral values; and a frequency-domain-to-time-domain converter for providing a time-domain audio representation using the decoded spectral values, in order to acquire the decoded audio information; wherein the arithmetic decoder is configured to select a mapping rule describing a mapping of a code value of the arithmetically-encoded representation onto a symbol code representing one or more of the decoded spectral values, or at least a portion of one or more of the decoded spectral values, in dependence on a context state; wherein the arithmetic decoder is configured to determine a numeric current context value describing the current context state in dependence on a plurality of previously decoded spectral values and also in dependence on whether a spectral value to be decoded is in a first predetermined frequency region or in a second predetermined frequency region, wherein the audio decoder is implemented using any of a hardware apparatus, a computer, and a combination of a hardware apparatus and a computer.