US 2013/0096928 A1 · METHOD AND APPARATUS FOR PROCESSING AN AUDIO SIGNAL

Abstract

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.

Claims12

Dependent claims

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.

4 more elements

An apparatus for of processing an audio signal, comprising:

a bandwidth determining unit configured to determine 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;
an order determining unit configured to determine order information corresponding to the current frame based on the bandwidth information;
a linear-predictive coefficient generating/transforming unit configured to generate a 1st set linear-predictive transform coefficient of a 1st order by performing a linear-predictive analysis on the current frame, the linear-predictive coefficient generating/transforming unit configured to generate a 2nd set linear-predictive transform coefficient of a 2nd order in accordance with the order information;
a 1st quantizing unit configured to generate a 1st set index by vector-quantizing the 1st set linear-predictive transform coefficient;
and
a 2nd quantizing unit, 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.

3 more elements

Dependencies are inferred from the claim text.

Method and apparatus for processing an audio signal

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Method and apparatus for processing an audio signal

Life of this patent

Abstract

Claims12