Interoperable vocoder

G - Physics – 10 – L

Patent

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Details

G10L 19/00 (2006.01) G10L 19/02 (2006.01) G10L 19/08 (2006.01)

Patent

CA 2447735

Encoding a sequence of digital speech samples into a bit stream includes dividing the digital speech samples into one or more frames and computing a set of model parameters for the frames. The set of model parameters includes at least a first parameter conveying pitch information. The voicing state of a frame is determined and the first parameter conveying pitch information is modified to designate the determined voicing state of the frame, if the determined voicing state of the frame is equal to one of a set of reserved voicing states. The model parameters are quantized to generate quantizer bits which are used to produce the bit stream.

Le codage d'une séquence d'échantillons vocaux numériques en un train de bits comprend la séparation des échantillons vocaux numériques en un ou plusieurs blocs et à calculer un ensemble de paramètres de modélisation pour les blocs. Cet ensemble comprend au moins un premier paramètre transmettant de l'information de tonie. L'état de voisement d'un bloc est déterminé et le premier paramètre qui transmet l'information de tonie est modifié pour désigner l'état de voisement déterminé du bloc, si ledit état est égal à l'un des ensembles d'états de voisement réservés. Les paramètres de modélisation sont quantifiés pour générer des bits de quantificateur servant à produire le train de bits.

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