connection with spectral band replication sbr or high frequency reconstruction hfr which is described in detail in wo 98 57436 a2 as it is known in the art spectral envelope replication or high frequency reconstruction includes certain steps at the encoder side as well as certain steps at the decoder side in the encoder an original signal having a full bandwidth is encoded by a source encoder the source encoder produces an output signal i e an encoded version of the original signal in which one or more frequency bands that were included in the original signal are not included any more in the encoded version of the original signal normally the encoded version of the original signal only includes a low band of the original bandwidth the high band of the original bandwidth of the original signal is not included in the encoded version of the original signal at the encoder side there is in addition a spectral envelope analyser for analysing the spectral envelope of the original signal in the bands which are missing in the encoded version of the original signal this missing band s is for example the high band the spectral envelope analyser is operative to produce a coarse envelope representation of the band which.