Abstract
An audio decoder 2200 for providing decoded audio information 2212 based on encoded audio information 2210 may generate a plurality of decoded spectral values 2224 arithmetically-encoded representation of the spectral values 2222. An arithmetic decoder 2220 for providing based on and a frequency-domain-to-time-domain converter for providing a time-domain audio representation using decoded spectral values 2224 to obtain decoded audio information. 2230. The arithmetic decoder is configured to select a mapping rule that describes the mapping of code values to symbol codes depending on the context state. The arithmetic decoder may determine a numerical current context value describing the current context state depending on a plurality of previously decoded spectral values and depending on whether the spectral value to be decoded is within the first predetermined frequency domain or the second predetermined frequency domain. configured to determine the numeric current context value. The audio encoder provides encoded audio information based on the input audio information.
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