Apparatus for generating an enhanced audio signal from an input 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 signal, comprising: a mapper for mapping a source spectral region of the input signal to a target region in the enhancement spectral region; and a noise filler configured for generating first noise values for a noise-filling region in the source spectral region of the input signal and for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from the first noise values or for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from first noise values in the source region, wherein the first noise values in the source region do not result from a noise filling operation, wherein the noise filler is configured to identify noise positions using an identification vector having entries for spectral positions in the source spectral region only, or having entries for spectral positions in the source spectral region and in the target spectral region, wherein the noise filler is configured for calculating an energy information on noise values indicated by the identification vector, wherein the noise filler is configured to calculate an energy information on inserted random values intended for the target region, wherein the noise filler is configured to calculate a gain factor for scaling the inserted random values intended for the target region using the energy information on the noise values indicated by the identification vector and using the energy information on the inserted random values intended for the target region, and wherein the noise filler is configured to apply the gain factor to the inserted random values intended for the target region. a mapper for mapping a source spectral region of the input signal to a target region in the enhancement spectral region; and a noise filler configured for generating first noise values for a noise-filling region in the source spectral region of the input signal and for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from the first noise values or for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from first noise values in the source region, wherein the first noise values in the source region do not result from a noise filling operation, wherein the noise filler is configured to identify noise positions using an identification vector having entries for spectral positions in the source spectral region only, or having entries for spectral positions in the source spectral region and in the target spectral region, wherein the noise filler is configured for calculating an energy information on noise values indicated by the identification vector, wherein the noise filler is configured to calculate an energy information on inserted random values intended for the target region, wherein the noise filler is configured to calculate a gain factor for scaling the inserted random values intended for the target region using the energy information on the noise values indicated by the identification vector and using the energy information on the inserted random values intended for the target region, and wherein the noise filler is configured to apply the gain factor to the inserted random values intended for the target region.