METHOD AND APPARATUS FOR PROCESSING AN AUDIO SIGNAL

摘要

The present invention is a method and an apparatus for processing an encoding signal capable of compressing and decompressing an audio signal at high efficiency. According to one embodiment of the present invention, an audio signal processing method is provided that includes discerning whether the coding type of an audio signal is a music signal coding type or not by using a first type information, discerning whether the coding type of the audio signal is a speech signal coding type or a mixed signal coding type by using a second type information, if the coding type of the audio signal is not a music signal coding type, extracting spectral data and linear prediction coefficients from the audio signal; if the coding type of the audio signal is a mixed signal coding type, generating a residual signal for linear prediction by performing Inverse Fourier Transform on the spectral data, decompressing the audio signal by linear prediction coding the linear prediction coefficients and the residual signal, and decompressing a high frequency area signal by using an extended base signal which is a partial area of the decompressed audio signal and  bandwidth extension information. The method of the present invention enables a wide variety of audio signal types to be encoded and decoded at high efficiency.