Patent ID: 9135922
Filing Date: 2015-09-15
Classification: G10L

Abstract:
1. A method of processing an audio signal, comprising: receiving, by a decoding apparatus, an input audio signal corresponding to a plurality of spectral coefficients; obtaining, by the decoding apparatus, location information indicating a location of a specific one of a plurality of the spectral coefficients based on an energy of the input signal; generating, by the decoding apparatus, a shape vector using the location information and the spectral coefficients, wherein the shape vector is generated using a part selected from the spectral coefficients and wherein the selected part is selected based on the location information; generating, by the decoding apparatus, a normalized value for the selected part; determining, by the decoding apparatus, a codebook index by searching a codebook corresponding to the shape vector, wherein determining the codebook index comprises generating a normalized shape vector by normalizing the shape vector using the normalized value and determining the codebook index by searching the codebook corresponding to the normalized shape vector; calculating, by the decoding apparatus, a mean of 1 generating, by the decoding apparatus, a differential vector using a value resulting from subtracting the mean from the 1 determining, by the decoding apparatus, the normalized value index by searching the codebook corresponding to the differential vector; transmitting, by the decoding apparatus, the codebook index and the location information; and transmitting, by the decoding apparatus, the mean and the normalized value index corresponding to the normalized value.