Howling frequency component emphasis method and apparatus

H - Electricity – 04 – R

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H04R 3/02 (2006.01) H03G 5/00 (2006.01) G01H 3/08 (2006.01)

Patent

CA 2502974

A method is designed for emphasizing a howling frequency component of a sound signal observed in an acoustic feedback system during an observation period having a predetermined length. The method is carried out by the steps of successively sampling the sound signal from the acoustic feedback system to provide a running set of samples of the sound signal during the observation period such that a total number of the samples in the running set increments each time one or more of new sample is added to the running set until the total number of the samples corresponds to the predetermined length of the observation period, recurrently calculating a running frequency characteristic of the sound signal on a common frequency axis for the observation period from the running set of the samples each time one ore more of new sample is added to the running set, and accumulating the recurrently calculated running frequency characteristics on the common frequency axis so as to emphasize a howling frequency component contained in the sound signal.

Méthode de mise en évidence de la composante de fréquence de sifflement d'un signal sonore observé dans un système de réaction acoustique durant une période d'observation à durée prédéterminée. La méthode comporte les étapes suivantes : échantilloner successivement le signal sonore du système de réaction acoustique pour obtenir une série courante d'échantillons du signal sonore durant la période d'observation, de sorte qu'un nombre total d'échantillons dans la série courante incrémente chaque fois un ou plusieurs nouveaux échantillons ajoutés à la série courante, jusqu'à ce que le nombre total d'échantillons corresponde à la longueur prédéterminée de la période d'observation, en calculant de façon récurrente une fréquence courante caractéristique du signal sonore sur un axe de fréquence commune pour la période d'observation, et accumuler les caractéristiques calculées de façon récurrente de la fréquence courante sur l'axe de fréquence commune de manière à mettre en évidence une composante de fréquence de sifflement contenue dans le signal sonore.

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