A method for encoding one or more input audio signals, wherein the method comprises: receiving the one or more input audio signals and obtaining therefrom one or more baseband signals and one or more residual signals, wherein spectral components of a baseband signal represent spectral components of a respective input audio signal in a first set of frequency subbands and spectral components in an associated residual signal represent spectral components of the respective input audio signal in a second set of frequency subbands that are not represented by the baseband signal; obtaining energy measures of at least some spectral components of one or more synthesized signals to be generated during decoding, wherein the one or more synthesized signals have spectral components within the second set of frequency subbands; obtaining energy measures of at least some spectral components of each residual signal; calculating scale factors by obtaining square roots of ratios of the energy measures of spectral components in the residual signals to the energy measures of spectral components in the one or more synthesized signals, square roots of ratios of the energy measures of spectral components in the one or more synthesized signals to the energy measures of spectral components in the residual signals, ratios of square roots of the energy measures of spectral components in the residual signals to square roots of the energy measures of spectral components in the one or more synthesized signals, or ratios of square roots of the energy measures of spectral components in the one or more synthesized signals to square roots of the energy measures of spectral components in the residual signals; and assembling signal information and scaling information into an encoded signal, wherein the signal information represents the spectral components in the one or more baseband signals and the scaling information represents the scale factors. receiving the one or more input audio signals and obtaining therefrom one or more baseband signals and one or more residual signals, wherein spectral components of a baseband signal represent spectral components of a respective input audio signal in a first set of frequency subbands and spectral components in an associated residual signal represent spectral components of the respective input audio signal in a second set of frequency subbands that are not represented by the baseband signal; obtaining energy measures of at least some spectral components of one or more synthesized signals to be generated during decoding, wherein the one or more synthesized signals have spectral components within the second set of frequency subbands; obtaining energy measures of at least some spectral components of each residual signal; calculating scale factors by obtaining square roots of ratios of the energy measures of spectral components in the residual signals to the energy measures of spectral components in the one or more synthesized signals, square roots of ratios of the energy measures of spectral components in the one or more synthesized signals to the energy measures of spectral components in the residual signals, ratios of square roots of the energy measures of spectral components in the residual signals to square roots of the energy measures of spectral components in the one or more synthesized signals, or ratios of square roots of the energy measures of spectral components in the one or more synthesized signals to square roots of the energy measures of spectral components in the residual signals; and assembling signal information and scaling information into an encoded signal, wherein the signal information represents the spectral components in the one or more baseband signals and the scaling information represents the scale factors.