Classification of audio signals

Details Classification of audio signals Classification of audio signals

G - Physics

10

L

G10L 19/14 (2006.01) G10L 19/08 (2006.01)

Patent

CA 2555352

The invention relates to an encoder (200) comprising an input (201) for inputting frames of an audio signal in a frequency band, at least a first excitation block (206) for performing a first excitation for a speech like audio signal, and a second excitation block (207) for performing a second excitation for a non-speech like audio signal. The encoder (200) further comprises a filter (300) for dividing the frequency band into a plurality of sub bands each having a narrower bandwidth than said frequency band. The encoder (200) also comprises an excitation selection block (203) for selecting one excitation block among said at least first excitation block (206) and said second excitation block (207) for performing the excitation for a frame of the audio signal on the basis of the properties of the audio signal at least at one of said sub bands. The invention also relates to a device, a system, a method and a storage medium for a computer program.

L'invention concerne un codeur (200) comprenant une entrée (201) pour l'entrée des trames d'un signal audio dans une bande de fréquence, au moins un premier bloc (206) d'excitation générant une première excitation pour un signal audio de type vocal, et un second bloc (207) d'excitation générant une seconde excitation pour un signal audio non vocal. Le codeur (200) comprend également un filtre (300) de division de la bande de fréquence en une pluralité de sous-bandes présentant chacune une largeur de bande plus étroite que ladite bande de fréquence. Le codeur (200) comprend également un bloc (203) de sélection d'excitation permettant de sélectionner un bloc d'excitation parmi ledit premier bloc (206) d'excitation et ledit second bloc (207) d'excitation afin de générer l'excitation d'une trame du signal audio en fonction des propriétés du signal audio au moins au niveau d'une desdits sous-bandes. L'invention concerne également un dispositif, un système, un procédé et un support de stockage pour un programme informatique.

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