Reduced-delay Quadrature Mirror Filter Structures for Subband Coding of Speech
نویسندگان
چکیده
In subband coding systems of speech, quadrature mirror filter (QMF) banks have been used effectively in a tree-structured form for decomposition and alias-free reconstruction of the speech signal. In the present paper, we derive some new causal and noncausal QMF structures which can reduce group delay. These structures are based on evenas well as odd-length fnite impulse response filters. Zusammenfassung. Quadratur-Spiegelfilterbiinke (QMF-B~inke) werden in der Teilband-Sprachkodierung h~iufig eingesetzt. In einer Baum-Struktur zerlegen sic das Signal und erlauben es auf gleichem Wege ohne Uberfaltungsfehler wieder zusammenzusetzen. Im weiteren werden einige neue QMF-Strukturen hergeleitet, die mit nichtrekursiven Filtern gerader oder ungerader L[ingen arbeiten. Dariiber hinaus wird gezeigt, wie einige dieser Strukturen in Teilbandkodern die Laufzeit verringern k5nnen, ohne die Qualit~it des rekonstruierten Sprachsignals zu verringern. Rrsumr. Dans le codage en sous bandes de ia parole, des bancs de filtres miroirs en quadrature (QMF) ont 6t6 utilisrs eflicacement, dans une structure en arbre, pour la drcomposition et la reconstitution parfaite du signal de parole. Dans cet article nous drrivons quelques structure causales et non-causales de QMF qui peuvent rrduire le retard de groupe. Ces structures sont basres sur des filtres ~ rrponse impulsionnelle de durre paire et impaire.
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تاریخ انتشار 1987