Audio encoder and decoder for encoding and decoding frames...

G - Physics – 06 – F

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G06F 17/14 (2006.01) G10L 19/02 (2006.01) G10L 19/14 (2006.01)

Patent

CA 2730195

An audio encoder (10) adapted for encoding frames of a sampled audio signal to obtain encoded frames, wherein a frame comprises a number of time domain audio samples. The audio encoder (10) comprises a predictive coding analysis stage (12) for determining information on coefficients of a synthesis filter and a prediction domain frame based on a frame of audio samples. The audio encoder (10) further comprises a time-aliasing introducing transformer (14) for transforming overlapping prediction domain frames to the frequency domain to obtain prediction domain frame spectra, wherein the time-aliasing introducing transformer (14) is adapted for transforming the overlapping prediction domain frames in a critically-sampled way. Moreover, the audio encoder (10) comprises a redundancy reducing encoder (16) for encoding the prediction domain frame spectra to obtain the encoded frames based on the coefficients and the encoded prediction domain frame spectra.

L'invention concerne un encodeur audio (10) conçu pour encoder les trames d'un signal audio échantillonné pour obtenir des trames encodées, une trame comprenant un certain nombre d'échantillons audio de domaine temporel. L'encodeur audio (10) comprend un étage d'analyse de codage prédictif (12) pour déterminer des informations concernant les coefficients d'un filtre de synthèse et une trame de domaine de prédiction sur la base d'une trame d'échantillons audio. L'encodeur audio (10) comprend en outre un transformateur introduisant un repliement temporel (14) pour transformer les trames de domaine de prédiction superposées dans le domaine fréquentiel pour obtenir des spectres de trames de domaine de prédiction, le transformateur introduisant un repliement temporel (14) étant conçu pour transformer les trames de domaine de prédiction superposées d'une manière échantillonnée de façon critique. De plus, l'encodeur audio (10) comprend un encodeur à réduction de redondance (16) pour encoder les spectres de trames de domaine de prédiction pour obtenir les trames encodées sur la base des coefficients et des spectres de trames de domaine de prédiction encodés.

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