Noise filler, noise filling parameter calculator, method for providing a noise filling parameter, method for providing a noise-filled spectral representation of an audio signal, corresponding computer program and encoded audio signal

摘要

A noise filler for providing a noise-filled spectral representation of an audio signal on the basis of an input spectral representation of the audio signal comprises a spectral region identifier configured to identify spectral regions of the input spectral representation spaced from non-zero spectral regions of the input spectral representation by at least one intermediate spectral region, to obtain identified spectral regions, and a noise inserter configured to selectively introduce noise into the identified spectral regions to obtain the noise-filled spectral representation of the audio signal. A noise filling parameter calculator for providing a noise filling parameter on the basis of a quantized spectral representation of an audio signal comprises a spectral region identifier, as mentioned above, and a noise value calculator configured to selectively consider quantization errors of the identified spectral regions for a calculation of the noise filling parameter. Accordingly, an encoded audio signal representation representing the audio signal can be obtained.