1. An audio signal decoder, comprising: a mechanism for receiving an encoded audio signal representation including an encoded spectrum representation, and an encoded time warp information, wherein the encoded spectrum representation includes 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; a context-based spectral value decoder configured to decode the codeword, 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 of the received encoded audio signal representation; and a time warping frequency-domain-to-time-domain converter configured to output a time-warped time-domain representation of a given audio frame of the received encoded audio signal representation on the basis of a set of decoded spectral values associated with the given audio frame and output 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; and wherein the audio signal decoder is implemented using a hardware apparatus, or using a computer, or using a combination of a hardware apparatus and a computer.