Methods and apparatus for encoding and decoding an highband...

G - Physics – 10 – L

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G10L 21/04 (2006.01) G10L 19/14 (2006.01)

Patent

CA 2602806

A wideband speech encoder according to one embodiment includes a lowband encoder and a highband encoder. The lowband encoder is configured to encode a lowband portion of a wideband speech signal as a set of filter parameters and an encoded excitation signal. The highband encoder is configured to calculate values for coding parameters that specify a spectral envelope and a temporal envelope of a highband portion of the wideband speech signal. The temporal envelope is based on a highband excitation signal that is derived from the encoded excitation signal. In one such example, the temporal envelope is based on a difference in levels between the highband portion and a synthesized highband signal, wherein the synthesized highband signal is generated according to the highband excitation signal and a set of highband filter parameters.

L'invention porte sur un codeur de parole de large bande qui, dans un mode de réalisation, comprend un codeur de bande basse et un codeur de bande haute. Le codeur de bande basse est configuré pour coder une partie de bande basse d'un signal de parole de large bande sous la forme d'un ensemble de paramètres de filtre et d'un signal d'excitation codé. Le codeur de bande haute est configuré pour calculer des valeurs pour des paramètres de codage qui spécifient une enveloppe spectrale et une enveloppe temporelle d'une partie de bande haute du signal de parole de large bande. L'enveloppe temporelle est basée sur un signal d'excitation de bande haute qui est dérivé du signal d'excitation codé. Dans un exemple, l'enveloppe temporelle est basée sur la différence de niveaux entre la partie de bande haute et un signal de bande haute synthétisé, le signal de bande haute synthétisé étant produit sur la base du signal d'excitation de bande haute et d'un ensemble de paramètres de filtre de bande haute.

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