Patent ID: 11881228
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 13:
14. A non-transitory digital storage medium having stored thereon a computer program for performing a method for encoding an audio signal, comprising
deriving prediction coefficients and a residual signal from an audio signal frame;
calculating a speech related spectral shaping information from the prediction coefficients;
calculating a gain parameter from an unvoiced residual signal and the spectral shaping information; and
forming an output signal based on an information related to a voiced signal frame, the gain parameter or a quantized gain parameter and the prediction coefficients,
amplifying and shaping a spectrum of the encoding noise-like signal using the speech related spectral shaping information and the gain parameter as temporary gain parameter to acquire an amplified shaped encoding noise-like signal;
such that for combining a spectrum of the encoding noise-like signal or a spectrum derived thereof with a transfer function comprising

Ft(z)=1−βz−1 

wherein z indicates a representation in the z-domain, wherein β represents a measure (voicing) for a voicing determined by relating an energy of a past frame of the audio signal and an energy of a present frame of the audio signal, wherein the measure β is determined in function of a voicing value,
when said computer program is run by a computer.