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 2218223

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 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 a small number of excitation sequences resembling the most a backward filtered target signal. With this small number of excitation sequences a full complexity search is made. Due to the reduced number of excitation sequences involved in the final selection the required computational complexity is reduced.

On effectue, dans un codeur CELP, une comparaison entre un signal cible et plusieurs signaux de synthèse. On dérive le signal de synthèse en filtrant plusieurs séquences d'excitation à l'aide d'un filtre de synthèse possédant des paramètres dérivés du signal cible. On sélectionne le signal d'excitation donnant une valeur d'erreur minimale entre le signal 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 choisissant un petit nombre de séquences d'excitation s'approchant le plus d'un signal cible ayant été soumis à un filtrage inverse. On effectue, en s'aidant de ce petit nombre de séquences d'excitation, une recherche d'une totale complexité. Du fait du nombre réduit de séquences d'excitation participant à la sélection définitive, le volume des calculs fort complexe que réclame ce type d'opération est réduit.

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