NOISE BACKGROUND, APPARATUS FOR PROCESSING NOISE BACKGROUND, METHOD OF PROVIDING NOISE BACKGROUND PARAMETERS, METHOD OF PROVIDING SPECTRAL REPRESENTATION OF AUDIO SIGNAL NOISE BACKGROUND, COMPUTER PROGRAM AND ENCODED AUDIO SIGNAL

摘要

FIELD: physics, acoustics.SUBSTANCE: noise filler for creating a noise-filled spectral representation of an audio signal based on an input spectral representation of the audio signal consists of 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 calculating a noise filling parameter based on a quantised spectral representation of an audio signal comprises a spectral region identifier, as mentioned above, and a noise value calculator configured to selectively consider quantisation errors in the identified spectral regions for calculation of the noise filling parameter. Accordingly, an encoded audio signal representation representing the audio signal can be obtained.EFFECT: improving noise-filling of an encoded audio signal while limiting undesirable distortions.15 cl, 9 dwg