Noise filling concept

Apparatus configured to perform noise filling on a spectrum of an audio signal in a manner dependent on a tonality of the audio signal, wherein the apparatus is configured to:

• dequantize the spectrum, as derived after the noise-filling, using a spectrally varying and signal-adaptive quantization step size controlled via a linear prediction spectral envelope signaled via linear prediction coefficients in a data stream into which the spectrum is coded, or scale factors relating to scale factor bands, signaled in the data stream into which the spectrum is coded,
• identify contiguous spectral zero-portions of the audio signal's spectrum and to apply the noise filling onto the contiguous spectral zero-portions identified, and
• respectively fill the contiguous spectral zero-portions of the audio signal's spectrum with noise spectrally shaped with a function having a local maximum surrounded by two outwardly falling flanks wherein the function is set dependent on a respective contiguous spectral zero-portion's width so that the function is confined to the respective contiguous spectral zero-portion, and wherein a fill width at half maximum of the function is adjusted dependent on the tonality of the audio signal so that, if the tonality of the audio signal increases, the fill width at half maximum of the function gets more compact in an inner of the respective contiguous spectral zero-portion and distanced from the respective contiguous spectral zero-portion's outer edges.