Patent ID: 9589576
Date: 2017-03-07
CPC Classifications: G10L

Claim:
1. A method performed by an audio decoder for supporting bandwidth extension, BWE, of a received signal, the method comprising: receiving, by a processor, a first signal representing the lower frequency spectrum of a segment of an audio signal; receiving, by the processor, a second signal, being a BWE signal, representing a higher frequency spectrum of the segment of the audio signal; determining, by the processor, a degree of voicing in the lower frequency spectrum of the audio signal, based on the received first signal; selecting, by the processor, a spectral tilt adaptation filter, out of at least two spectral tilt adaptation filters having different spectral attenuation characteristics, based on the determined degree of voicing; determining, by the processor, a level of spectral stability in the lower frequency spectrum of the audio signal, based on the received first signal, wherein the selection of the spectral tilt adaptation filter is further based on the determined level of spectral stability; and applying, by the processor, the selected spectral tilt adaptation filter on the received second signal.