Patent ID: 11862184
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 23:
24. A method for processing an encoded audio signal, the encoded audio signal comprising a sequence of access units, each access unit of the sequence of access units comprising a core audio signal with a first spectral width and parameters describing a spectrum above the first spectral width, the method comprising:
generating, from an access unit of the encoded audio signal, the core audio signal and the parameters, wherein the parameters are spectral envelope parameters comprising spectral envelope parameters for a first half of time slots of the access unit and spectral envelope parameters for a second half of time slots of the access unit;
upsampling the core audio signal of the access unit to obtain a first upsampled spectrum and a timely consecutive second upsampled spectrum, the first upsampled spectrum and the second upsampled spectrum, both, comprising a same content as the core audio signal and comprising a second spectral width being greater than the first spectral width of the core audio signal;
converting spectral envelope parameters for the first half of time slots of the access unit into a first part of corresponding gap filling energy parameters and converting the spectral envelope parameters for the second half of time slots of the access unit into a second part of corresponding gap filling energy parameters; and
spectral gap filling processing the first upsampled spectrum and the second upsampled spectrum using the first part of the corresponding gap filling energy parameters and using the second part of the corresponding gap filling energy parameters.