Method and apparatus for processing an audio signal

摘要

The present invention relates to a method for processing an audio signal, comprising: determining bandwidth information indicating to which of a plurality of bands the current frame corresponds; determining information on the order corresponding to the present frame on the basis of the bandwidth information; performing a linear predictive analysis of the present frame to generate a first set linear predictive transform coefficient of a first order; performing a vector quantization on the first set linear predictive coefficient to generate a first index; performing a linear predictive analysis of the current frame to generate a second set linear predictive transform coefficient of a second order in accordance with the information on the order; and performing a vector quantization on a second set difference by using the first set index and the second set linear predictive transform coefficient, when the second set linear predictive coefficient is generated.

主权项

1. A method of processing an audio signal, comprising the steps of:
determining bandwidth information indicating that a current frame corresponds to which one among a plurality of bands including a 1st band and a 2nd band by performing a spectrum analysis on the current frame of the audio signal; determining order information corresponding to the current frame based on the bandwidth information; generating a 1st set linear-predictive transform coefficient of a 1st order by performing a linear-predictive analysis on the current frame; generating a 1st set index by vector-quantizing the 1st set linear-predictive transform coefficient; generating a 2nd set linear-predictive transform coefficient of a 2nd order in accordance with the order information by performing the linear-predictive analysis on the current frame; and if the 2nd set linear-predictive transform coefficient is generated, performing a vector-quantization on a 2nd set difference using the 1st set index and the 2nd set linear-predictive transform coefficient.