Reduced complexity signal transmission system

H - Electricity – 03 – M

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H03M 13/00 (2006.01) G10L 19/12 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2218217

In a CELP coder a comparison between a target signal and a plurality of synthetic signals is made. The synthetic signal is derived by filtering a plurality of excitation sequences from a one-dimensional codebook by a synthesis filter having parameters derived from the target signal. The excitation signal which results in a minimum error between the target signal and the synthetic signal is selected. The search for the best excitation signal requires a substantial computational complexity. To reduce the complexity a preselection of a small number of excitation sequences is made by selecting only every L th codebook entry for preselecting a plurality of excitation sequences. With this small number of excitation sequences a full complexity search is made in which all excitation sequences surrounding the preselected ones are involved in the selection.

On effectue, dans un codeur CELP, une comparaison entre un signal de cible et plusieurs signaux de synthèse. On dérive le signal de synthèse en filtrant plusieurs séquences d'excitation provenant d'un bloc de mémoire code monodimensionnel à l'aide d'un filtre de synthèse possédant des paramètres dérivés du signal de cible. On sélectionne le signal d'excitation donnant une valeur d'erreur minimale entre le signal de cible et le signal de synthèse. La recherche du meilleur signal d'excitation exige des calculs très complexes. Afin de réduire cette complexité, on effectue une présélection d'un petit nombre de séquences d'excitation en ne choisissant que chaque énième entrée de bloc de mémoire code pour présélectionner plusieurs séquences d'excitation. On effectue, en s'aidant de ce petit nombre de séquences d'excitation, une recherche d'une totale complexité, toutes les séquences d'excitation entourant celles qui ont été présélectionnées participant alors à la sélection.

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