Encoder and Method for encoding audio, audio information, a method for decoding audio Information and computer program that uses a hash table that describes significant State values As interval limits

摘要

An Audio Decoder to obtain a Decoded audio data based on the encoded audio Information comprises an arithmetic Decoder to provide a Plurality of Decoded Spectral values on the basis of a coded representation aritmu00e9ticame Nte Spectral values,And a Converter in the frequency domain to the Time Domain to produce an audio Representation in the Time Domain using the Decoded Spectral values, in order to obtain the information of Decoded audio.The arithmetic Decoder is configured to select a Rule mapping that describes the Mapping of a value of Code in a code symbol depending on a State of Context described by a numerical value of the current context.The arithmetic Decoder is configured to determine the numerical value of current context depending on a Plurality of previously Decoded Spectral values.The arithmetic Decoder is configured to evaluate a hash Table, The Elements which define both values of significant State between the numerical values of Context and the Limits of the ranges of Numerical values of Context, to select the mapping rule.An index value of Mapping rule is individually associated to a value that is a meaningful context State value is significant, and a common index value of Mapping rule is associated to different Numerical values of context that lie within a range bounded by limit Interval teas. An audio encoding uses a similar Concept.