Apparatus for generating a frequency enhancement audio signal, comprising: a signal generator for generating an enhancement signal from a core audio signal, the enhancement signal comprising an enhancement frequency range not included in the core audio signal, wherein a time portion of the enhancement signal comprises one or more subband signals for a single subband or a plurality of subbands; and a synthesis filterbank for generating the frequency enhancement audio signal using the enhancement signal, characterized in that the signal generator is configured to perform a limitation operation in an energy limitation based on the following equations: limFac = fac ∗ E f − 1 E f Q ^ r t, f = limFac Qr t, f Q ^ i t, f = limFac Qi t, f wherein fac is a predefined threshold, wherein Qr t,f is a real part of a subband signal in a subband indicated by a subband index f and a time-slot indicated by a time index t, wherein Qi t,f is a corresponding imaginary part of the subband signal in the subband indicated by the subband index f and the time-slot indicated by the time index t, wherein Q̂r t,f is an energy limited real part of the subband signal in the subband indicated by the subband index f and the time-slot indicated by the time index t subsequent to the energy limitation, wherein Q̂i t,f is a corresponding energy limited imaginary part of the subband signal in the subband indicated by the subband index f and the time-slot indicated by the time index t subsequent to the energy limitation, wherein limFac is a limitation factor, wherein E f is an energy of the subband signal in the subband indicated by the subband index f, and wherein E f - 1 is an energy of a subband signal in a subband indicated by the subband index f-1, the subband indicated by the subband index f - 1 having a lower center frequency than a center frequency of the subband indicated by the subband index f. a signal generator for generating an enhancement signal from a core audio signal, the enhancement signal comprising an enhancement frequency range not included in the core audio signal, wherein a time portion of the enhancement signal comprises one or more subband signals for a single subband or a plurality of subbands; and a synthesis filterbank for generating the frequency enhancement audio signal using the enhancement signal, characterized in that the signal generator is configured to perform a limitation operation in an energy limitation based on the following equations: limFac = fac ∗ E f − 1 E f Q ^ r t, f = limFac Qr t, f Q ^ i t, f = limFac Qi t, f wherein fac is a predefined threshold, wherein Qr t,f is a real part of a subband signal in a subband indicated by a subband index f and a time-slot indicated by a time index t, wherein Qi t,f is a corresponding imaginary part of the subband signal in the subband indicated by the subband index f and the time-slot indicated by the time index t, wherein Q̂r t,f is an energy limited real part of the subband signal in the subband indicated by the subband index f and the time-slot indicated by the time index t subsequent to the energy limitation, wherein Q̂i t,f is a corresponding energy limited imaginary part of the subband signal in the subband indicated by the subband index f and the time-slot indicated by the time index t subsequent to the energy limitation, wherein limFac is a limitation factor, wherein E f is an energy of the subband signal in the subband indicated by the subband index f, and wherein E f - 1 is an energy of a subband signal in a subband indicated by the subband index f-1, the subband indicated by the subband index f - 1 having a lower center frequency than a center frequency of the subband indicated by the subband index f. wherein Qr t,f is a real part of a subband signal in a subband indicated by a subband index f and a time-slot indicated by a time index t, wherein Qi t,f is a corresponding imaginary part of the subband signal in the subband indicated by the subband index f and the time-slot indicated by the time index t, wherein Q̂r t,f is an energy limited real part of the subband signal in the subband indicated by the subband index f and the time-slot indicated by the time index t subsequent to the energy limitation, wherein Q̂i t,f is a corresponding energy limited imaginary part of the subband signal in the subband indicated by the subband index f and the time-slot indicated by the time index t subsequent to the energy limitation, wherein limFac is a limitation factor, wherein E f is an energy of the subband signal in the subband indicated by the subband index f, and wherein E f - 1 is an energy of a subband signal in a subband indicated by the subband index f-1, the subband indicated by the subband index f - 1 having a lower center frequency than a center frequency of the subband indicated by the subband index f.