Filterbank structure and method for filtering and separating...

Details Filterbank structure and method for filtering and separating... Filterbank structure and method for filtering and separating...

H - Electricity

04

R

H04R 25/00 (2006.01)

Patent

CA 2286051

A filterbank structure is provided which provides a flexible compromise between the conflicting goals of processing delay, filter sharpness, memory usage and band interaction. The filterbank has an adjustable number of bands and a stacking which provides for a selectable shift of band frequencies to one of two discrete sets of center frequencies. The width of the bands and hence the number of the bands is selected depending upon acceptable delay, memory usage, and processing speed required. The flexibility in terms of stacking of the bands provides twice the number of potential band edge placements, which is advantageous for hearing loss fitting, especially at low frequencies. The same filter coefficients can be used for analysis and synthesis, to reduce memory usage.

Structure de banc de filtres offrant un compromis souple entre les objectifs antagonistes de délai de traitement, d'acuité du filtre, d'utilisation de la mémoire et d'interaction des bandes. Ce banc de filtres possède un nombre réglable de bandes et un empilement permettant de déplacer de façon sélective les fréquences de bande vers un de deux ensembles discrets de fréquences centrales. La largeur des bandes et, de ce fait, leur nombre sont sélectionnés en fonction du délai acceptable, de l'utilisation de la mémoire et de la vitesse de traitement nécessaire. La souplesse concernant l'empilement des bandes permet d'obtenir deux fois le nombre d'emplacements potentiels d'extrémité de bande, ce qui présente un avantage pour des prothèses auditives, en particulier, à des fréquences basses. On peut utiliser les même coefficients de filtre pour l'analyse et la synthèse afin de limiter l'utilisation de la mémoire.

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