Patent ID: 9275648
Filing Date: 2016-03-01
CPC Classification: G10L

Claim Text:
1. A method of decoding an audio signal, comprising: receiving, by a decoding apparatus, spatial information and a narrow-band downmix signal, the narrow-band downmix signal corresponding to a first band from a bitstream; decoding, by the decoding apparatus, the narrow-band downmix signal using one of an audio coding scheme and a speech coding scheme, wherein the speech coding scheme includes Linear Prediction Coding (LPC); obtaining, by the decoding apparatus, spectral data corresponding to the first band from the narrow-band downmix signal; determining, by the decoding apparatus, a copy band based on frequency information of the copy band, the copy band corresponding to a partial band of the first band; time-dilating the spectral signal of the copy band, and decimating the time dilated spectral signal, wherein the time dilating step dilates a time domain signal using a phase vocoder scheme; generating, by the decoding apparatus, spectral data of a target band based on the decimated spectral signal, the target band corresponding to the second band using spectral data of the copy band; and generating an output signal using a broadband downmix signal and spatial information, wherein the broadband downmix signal includes the spectral data of the target band and the spectral data of the first band, the output signal including at least two channels, wherein the copy band exists in an upper part of the first band, wherein the frequency information of the copy band comprises at least one of a start frequency, a start band, and index information indicating the start band, and wherein the at least one of a start frequency, a start band, and index information indicating the start band is determined variably per frame and is formed from a high frequency band or a low frequency band based on a numerical value of a brightness of sound for the audio signal using a spectral centroid.