Abstract
An audio decoder for providing a decoded audio information on the basis of an encoded audio information comprises a 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 obtain the decoded audio information. 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 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.
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