Patent ID: 9466306
Filing Date: 2016-10-11
CPC Classification: G10L

Claim Text:
1. A method for generating a reconstructed audio signal having a baseband portion and a highband portion, the method comprising: deformatting an encoded audio signal into a first part and a second part; extracting, from the first part, temporal envelope information, wherein the temporal envelope information includes coefficients representing a reconstruction filter; extracting, from the first part, spectral components of the baseband portion, wherein the spectral components of the baseband portion do not include spectral components of the highband portion; decoding the first part to obtain a decoded baseband audio signal, wherein the decoding includes filtering in a frequency domain at least some of the spectral components of the baseband portion with the reconstruction filter using the temporal envelope information to shape a temporal envelope of the baseband portion; extracting, from the second part, a noise parameter and an estimated spectral envelope of the highband portion; obtaining a plurality of subband signals by filtering the decoded baseband audio signal; generating a high-frequency reconstructed signal by copying, in a circular manner, a number of consecutive subband signals of the plurality of subband signals; obtaining an envelope adjusted high-frequency signal by adjusting, based on the estimated spectral envelope of the highband portion, a spectral envelope of the high-frequency reconstructed signal; generating a noise component based on the noise parameter, wherein the noise parameter indicates a level of noise contained in the highband portion; obtaining a combined high-frequency signal by adding the noise component to the envelope adjusted high-frequency signal; and obtaining a time-domain reconstructed audio signal by combining the decoded baseband audio signal and the combined high-frequency signal; wherein the method is implemented by an audio decoding device comprising one or more hardware elements.