Patent ID: 11869521
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 1:
2. A method for providing a decoded representation of an audio signal on the basis of an encoded audio stream, the method comprising:
introducing noise into spectral components of a plurality of frequency bands, to which separate frequency band gain information is associated, on the basis of a common multi-band noise intensity value;
wherein the method comprises receiving a plurality of spectral bin values representing different overlapping or non-overlapping frequency portions of the first frequency band of a frequency domain audio signal representation, and to receive a plurality of spectral bin values representing different overlapping or non-overlapping frequency portions of the second frequency band of the frequency domain audio signal representation; and
wherein the method comprises replacing one or more spectral bin values of the first frequency band of the plurality of frequency bands with a first spectral bin noise value, a magnitude of which is determined by the multi-band noise intensity value, and replacing one or more spectral bin values of the second frequency band of the plurality of frequency bands with a second spectral bin noise value comprising the same magnitude as the first spectral bin noise value; wherein the method comprises scaling spectral bin values of the first frequency band of the plurality of frequency bands with a first frequency band gain value, to acquire scaled spectral bin values of the first frequency band, and scaling spectral bin values of the second frequency band of the plurality of frequency bands with a second frequency band gain value, to acquire scaled spectral bin values of the second frequency band, such that the replaced spectral bin values, replaced with the first and second spectral bin noise values, are scaled with different frequency band gain values, and such that the replaced spectral bin value, replaced with the first spectral bin noise value, and un-replaced spectral bin values of the first frequency band representing an audio content of the first frequency band are scaled with the first frequency band gain value, and that the replaced spectral bin value, replaced with the second spectral bin noise value, and un-replaced spectral bin values of the second frequency band representing an audio content of the second frequency band are scaled with the second frequency band gain value,
wherein the method is preformed using a hardware apparatus, or using a computer, or using a combination of a hardware apparatus and a computer.