G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/14 (2006.01)
Patent
CA 2551281
There is provided a voice/musical sound encoding device capable of performing a high-quality encoding by performing vector quantization by considering the human hearing characteristics. In this voice/musical sound encoding device, an orthogonal conversion unit (201) converts a voice/musical sound signal from a time component to a frequency component. A hearing masking characteristic value calculation unit (203) calculates a hearing masking characteristic value from the voice/musical sound signal. According to the hearing masking characteristic value, a vector quantization unit (202) performs vector quantization by changing the method for calculating the distance between the code vector obtained from a predetermined code book and the frequency component.
L'invention concerne un dispositif de codage vocal/musical pouvant réaliser un codage de grande qualité en effectuant une quantification vectorielle avec prise en considération des caractéristiques auditives humaines. Ce dispositif présente une unité de conversion orthogonale (201) qui convertit une composante temporelle d'un signal vocal/musical en une composante fréquentielle. Une unité de calcul de valeurs caractéristiques de masquage auditif (203) calcule une valeur caractéristique de masquage auditif à partir du signal vocal/musical. En fonction de la valeur caractéristique de masquage auditif, une unité de quantification vectorielle (202) effectue une quantification vectorielle en changeant la méthode de calcul de l'écart entre le vecteur de code obtenu à partir d'un livre de code prédéterminé et la composante fréquentielle.
Morii Toshiyuki
Sato Kaoru
Yamanashi Tomofumi
Matsushita Electric Industrial Co. Ltd.
Osler Hoskin & Harcourt Llp
Panasonic Corporation
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