G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/00 (2006.01)
Patent
CA 2373479
A speech decoding device of the invention smoothes, in decoding speech signal in a voice-less period, RMS and filter coefficients which is discontinuously transmitted, and provides them to a synthesis filter. Thereby, it is capable of preventing discontinuous changing of the filter coefficient caused by the intermittent transmission of the filter coefficient. As a result, a quality of decoding can be improved. Also, to remove an effect, caused by the smoothing process, from the filter coefficients or the RMS which are transmitted in the past frames, a smoothing factor is adjusted not to perform smoothing while a certain time period (or a certain number of frames) from when a transition is made from a voice period from a voice-less period, or when a decoded feature parameter satisfies a predetermined condition.
L'invention porte sur un décodeur vocal, lissant le facteur de filtrage transmis de manière intermittente au RMS, puis décodant la partie non vocale et la transmettant à un filtre synthétiseur afin de prévenir les variations discontinues du facteur de filtrage et améliorer la qualité du son décodé. Pour limiter l'influence du facteur de filtrage et du RMS transmis dans les trames précédentes et dû aux opérations de lissage, on fixe le coefficient de lissage pour que l'opération de lissage ne se fasse pas pendant un temps prédéterminé ni pendant des trames prédéterminées lorsque le décodage passe d'une partie vocale à une partie non vocale, ou si le paramètre de caractérisation décodé remplit une condition prédéterminée.
Ito Hironori
Serizawa Masahiro
Corporation Nec
Smart & Biggar
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