1. An audio signal decoder for providing a decoded audio signal representation on the basis of an encoded audio signal representation comprising an encoded spectrum representation and an encoded time warp information, the audio signal decoder comprising: a context-based spectral value decoder configured to decode a codeword describing one or more spectral values or at least a portion of a number representation of one or more spectral values in dependence on a context state, to acquire decoded spectral values; a context state determinator configured to determine a current context state in dependence on one or more previously decoded spectral values; a time warping frequency-domain-to-time-domain converter configured to provide a time-warped time-domain representation of a given audio frame on the basis of a set of decoded spectral values associated with the given audio frame and provided by the context-based spectral value decoder and in dependence on the time warp information; wherein the context-state determinator is configured to adapt the determination of the context state to a change of a fundamental frequency between subsequent audio frames.