Programmable digital call progress tone detector

H - Electricity – 04 – M

Patent

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Details

H04M 3/22 (2006.01) H04Q 1/44 (2006.01) H04Q 1/457 (2006.01)

Patent

CA 2116043

The present invention relates to a method of detecting call progress tones specified in a tone plan, comprised of calculating a power spectrum of a segment of an input signal containing a call progress tone, discriminating, based on the power spectrum, likely frequencies of the call progress tone, determining likely tone plan frequency bands based on between one and three of the frequencies, filtering the input signal in the frequency bands and extracting quadrature components of the input signal thereby, calculating three spectral moments of the input signal from the quadrature components for the frequency bands, and verifying at least one frequency of a call progress tone contained in the input signal based on the spectral moments.

éthode de détection de tonalités de progression d'appels spécifiées dans un plan de tonalités. Comprend ce qui suit : calculer une puissance spectrique d'un segment d'un signal d'entrée contenant une tonalité de progression d'appel; discriminer, en fonction de la puissance spectrique, les fréquences probables de la tonalité de progression d'appel; déterminer les bandes de fréquences probables du plan de tonalités en fonction d'une à trois des fréquences; filtrer le signal d'entrée dans les bandes de fréquences et en extraire ainsi les composantes en quadrature; calculer trois moments spectraux du signal d'entrée à partir des composantes en quadrature pour les bandes de fréquences; et vérifier au moins une fréquence d'une tonalité de progression d'appel contenue dans le signal d'entrée en fonction des moments spectraux.

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