Perceptual noise shaping in the time domain via lpc...

H - Electricity – 03 – M

Patent

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H03M 7/36 (2006.01)

Patent

CA 2194419

A method and apparatus for the perceptual coding of audio signals in which perceptual noise shaping is achieved in the time domain by performing a (linear) prediction (i.e., filtering) in the frequency domain. As a result, the temporal spread of quantization noise is reduced. Specifically, according to one illustrative embodiment of the present invention, a method comprises decomposition of the audio signal into a plurality of spectral component signals; generating a prediction signal representative of a prediction of one of said spectral component signals, said prediction based on one or more other ones of said spectral component signals; comparing the prediction signal with said one of said spectral component signals to generate a prediction error signal; coding said one of said spectral component signals based on the prediction error signal to generate a coded spectral component signal; and generating the encoded signal based on the coded spectral component signal.

L'invention est une méthode et un appareil de codage perceptif de signaux audio où la mise en forme perceptive du bruit est réalisée dans le domaine temporel au moyen d'une prédiction (linéaire), c'est-à-dire d'un filtrage, dans le domaine fréquentiel. Ceci amène une réduction de l'étalement temporel du bruit de quantification. En particulier, dans une réalisation illustrative de l'invention, la méthode consiste à décomposer un signal audio en plusieurs composantes spectrales; à engendrer un signal de prédiction représentatif de l'une des composantes spectrales mentionnées précédemment, la prédiction étant basée sur une ou plusieurs des autres composantes spectrales; à comparer le signal de prédiction avec la composante spectrale faisant partie des composantes spectrales mentionnées pour engendrer un signal d'erreur de prédiction; à coder la composante spectrale faisant partie partie des composantes spectrales mentionnnées en se basant sur le signal d'erreur de prédiction pour engendrer une composante spectrale codée; et à engendrer le signal codé en se basant sur la composante spectrale codée.

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