A high resolution post processing method for a speech decoder

G - Physics – 10 – L

Patent

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G10L 19/14 (2006.01) G10L 21/02 (2006.01)

Patent

CA 2282693

A post-processing method for a speech decoder (1) which gives a decoded speech signal in the time domain in order to obtain high frequency resolution from a frequency spectrum having non-harmonic and noise deficiencies. The method comprises the following steps: a) transforming (21) the decoded time domain signal to a frequency domain signal by means of a high frequency resolution transform (FFT); b) analysing (5) the energy distribution of said frequency domain signal throughout its frequency area (4 kHz) to find the disturbing frequency components and to prioritize such frequency components which are situated in the higher part of the frequency spectrum; c) finding (6) the suppression degree for said disturbing frequency components based on said prioritizing; d) controlling a post-filtering (31) of said transform in dependence of said finding (6); and e) inverse transforming (4) the post- filtered transform in order to obtain a post-filtered decoded speech signal in the time domain.

L'invention concerne un procédé de post-traitement destiné à un décodeur vocal (1), lequel donne un signal vocal décodé dans le domaine temporel, afin d'obtenir une haute résolution de fréquence à partir d'un spectre de fréquences présentant des déficiences non harmoniques et de bruit. Le procédé comprend les étapes consistant: a) à transformer (21) le signal du domaine temporel décodé en un signal de domaine fréquentiel au moyen d'une transformation de haute résolution de fréquence (TRF), b) à analyser (5) la répartition d'énergie dudit signal du domaine fréquentiel dans toute sa zone de fréquence (4 kHz) pour trouver les composantes de fréquence perturbatrices et afin de donner la priorité aux composantes de fréquence se trouvant dans la partie supérieure du spectre de fréquence, c) à trouver (6) le degré de suppression desdites composantes de fréquence perturbatrices sur la base du classement par ordre de priorité, d) à commander un post-filtrage (31) de ladite transformation selon ce que l'on a trouvé en (6), et e) à procéder à une transformation inverse (4) de la transformation post-filtrée afin d'obtenir un signal vocal post-filtré décodé dans le domaine temporel.

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