Abstract
The audio decoder 200 that provides the decoded audio information 212 based on the encoded audio information 210 provides a plurality of decoded spectral values 232 based on the arithmetically encoded representation 222 of the spectral values Domain-to-time-domain converter 260 that provides a time-domain audio representation 262 using the decoded spectral values to obtain decoded audio information. The arithmetic decoder 230 is configured to select a mapping rule indicating a mapping of code values to symbol codes according to the context state. The arithmetic decoder is configured to determine or modify the current context state according to a plurality of previous decoded spectral values. The arithmetic decoder is configured to detect a group of a plurality of previously decoded spectral values that individually or collectively meet a predetermined condition about magnitude and determine a current context state according to a result of the detection. Audio encoders use similar principles.
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