Apparatus for generating an enhanced audio signal from an input audio signal, wherein the enhanced audio signal has spectral values for an enhancement spectral region, the spectral values for the enhancement spectral region not being contained in the input audio signal, the apparatus comprising: a mapper for mapping a source spectral region of the input audio signal to a target region in the enhancement spectral region, wherein first noise values in a noise-filling region of the source spectral region of the input audio signal are not included in the noise-filling region of the source spectral region, wherein, for the target region, a source region identification exists, and wherein the mapper is configured for selecting the source spectral region using the source region identification and for mapping the selected source spectral region to the target region; and a noise filler configured for generating second noise values for a noise region in the target region in the enhancement spectral region, wherein the second noise values are decorrelated from the first noise values in the noise-filling region of the source spectral region of the input audio signal, wherein the input audio signal is an encoded signal comprising noise-filling parameters for the source spectral region of the input audio signal, and wherein the noise filler is configured for identifying of noise in the source spectral region of the input audio signal using the noise-filling parameters for the source spectral region of the input audio signal or by identifying zero spectral values in the source spectral region, generating the first noise values in the noise-filling region in the source spectral region of the input audio signal using an energy information of the noise-filling parameters read from the encoded signal comprising the noise-filling parameters for the source spectral region of the input audio signal, the energy information identifying an energy of the first noise values in the noise-filling region, subsequently or concurrently to the step of generating the first noise values, inserting random values in positions in the target region identified by using the noise-filling parameters together with the source region identification, and scaling the random values inserted in the positions in the target region to obtain the second noise values. a mapper for mapping a source spectral region of the input audio signal to a target region in the enhancement spectral region, wherein first noise values in a noise-filling region of the source spectral region of the input audio signal are not included in the noise-filling region of the source spectral region, wherein, for the target region, a source region identification exists, and wherein the mapper is configured for selecting the source spectral region using the source region identification and for mapping the selected source spectral region to the target region; and a noise filler configured for generating second noise values for a noise region in the target region in the enhancement spectral region, wherein the second noise values are decorrelated from the first noise values in the noise-filling region of the source spectral region of the input audio signal, wherein the input audio signal is an encoded signal comprising noise-filling parameters for the source spectral region of the input audio signal, and wherein the noise filler is configured for identifying of noise in the source spectral region of the input audio signal using the noise-filling parameters for the source spectral region of the input audio signal or by identifying zero spectral values in the source spectral region, generating the first noise values in the noise-filling region in the source spectral region of the input audio signal using an energy information of the noise-filling parameters read from the encoded signal comprising the noise-filling parameters for the source spectral region of the input audio signal, the energy information identifying an energy of the first noise values in the noise-filling region, subsequently or concurrently to the step of generating the first noise values, inserting random values in positions in the target region identified by using the noise-filling parameters together with the source region identification, and scaling the random values inserted in the positions in the target region to obtain the second noise values. identifying of noise in the source spectral region of the input audio signal using the noise-filling parameters for the source spectral region of the input audio signal or by identifying zero spectral values in the source spectral region, generating the first noise values in the noise-filling region in the source spectral region of the input audio signal using an energy information of the noise-filling parameters read from the encoded signal comprising the noise-filling parameters for the source spectral region of the input audio signal, the energy information identifying an energy of the first noise values in the noise-filling region, subsequently or concurrently to the step of generating the first noise values, inserting random values in positions in the target region identified by using the noise-filling parameters together with the source region identification, and scaling the random values inserted in the positions in the target region to obtain the second noise values.