Detection of tones while minimizing incorrect identification...

H - Electricity – 04 – M

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H04M 3/22 (2006.01) H04Q 1/457 (2006.01) H04Q 1/46 (2006.01)

Patent

CA 2149163

A first validation circuit utilizes residual energy unaccounted for by a linear predictive coding model for a specified order of model as a criteria on which to make a validity determination of whether a valid tone or digit has been received. A second validation circuit operating in conjunction with the first validation circuit utilizes discrete Fourier transforms at the center and adjacent frequencies to energy peaks associated with tones. A ratio of the peak energy to the adjacent energies is utilized in combination with corresponding thresholds to make a validity determination. The combination of the first and second validation circuit provides a high level of confidence that a particular tone or digit has been detected.

Un premier circuit de validation utilise l'énergie résiduelle dont ne tient pas compte un modèle de codage prédictif linéaire d'un ordre particulier, comme critère pour déterminer si une tonalité ou un élément numérique valide a été reçu. Un deuxième circuit de validation fonctionnant conjointement avec le premier applique des transformées de Fourier discrètes au niveau des fréquences centrales et adjacentes à des pointes d'énergie associées aux tonalités. Un rapport de l'énergie des pointes aux énergies des fréquences adjacentes est utilisé conjointement avec les seuils correspondants aux fins de la détermination de validité. La combinaison du premier et du deuxième circuits de validation confirme, avec un haut degré de fiabilité, la détection d'une tonalité ou d'un élément numérique particulier.

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