Audio coding method and apparatus using harmonic extraction

G - Physics – 10 – L

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G10L 19/00 (2006.01) G10L 19/02 (2006.01) H03M 7/30 (2006.01)

Patent

CA 2490064

A method and apparatus for effectively encoding an audio signal into a Moving Picture Experts Group (MPEG)-1 layer III audio signal of a low-speed bitrate. In the audio encoding method, harmonic components are extracted using fast Fourier transformation (FFT) result information that is obtained by applying psycho-acoustic model 2 to received pulse code modulation (PCM) audio data. Then, the extracted harmonic components are removed from the received PCM audio data. Thereafter, the PCM audio data from which the extracted harmonic components are removed is subjected to a modified discrete cosine transform (MDCT) and quantization. Accordingly, efficient encoding can be achieved even using a small number of allocated bits.

La présente invention concerne un procédé et un appareil permettant le codage efficace d'un signal audio dans un signal audio de couche III MPEG-1 d'un débit binaire à vitesse lente. Dans le procédé de codage audio, les composantes harmoniques sont extraites en utilisant une information de résultat d'une transformée rapide de Fourier qui est obtenue par l'application d'un modèle 2 psychoacoustique à des données audio à modulation par codage d'impulsions (MIC) reçues. Ensuite, les composantes extraites sont enlevées des données audio MIC reçues. Après, les données audio MIC desquelles les composantes harmoniques sont enlevées sont soumises à une transformation en cosinus discrète modifiée et une quantification. Ainsi, on peut obtenir un codage efficace même en utilisant un nombre restreint de bits alloués.

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