Patent ID: 9653085
Date: 2017-05-16
CPC Classifications: G10L

Claim:
1. An audio decoder for reconstructing an original audio signal having a baseband up to a cutoff frequency and high-frequency components not included in the baseband above the cutoff frequency, the audio decoder comprising: a bitstream deformatter that extracts a representation of the baseband, an estimated spectral envelope, and noise-blending parameters from an audio bitstream, wherein the representation of the baseband is a frequency domain representation that includes baseband spectral components, and wherein the cutoff frequency is capable of being varied dynamically; a spectral component regenerator that copies or translates all or at least some of the baseband spectral components to non-overlapping frequency ranges of the high-frequency components not included in the baseband to generate regenerated spectral components; a gain adjuster that modifies a spectral envelope of the regenerated spectral components based at least in part on the estimated spectral envelope and the noise-blending parameters to generate gain-adjusted regenerated spectral components, wherein the noise-blending parameters include a noise parameter for each of a plurality of frequency bands above the cutoff frequency; and a synthesis filterbank that: wherein the audio decoder comprises one or more hardware elements.