Echo detection and delay estimation using a pattern...

H - Electricity – 04 – B

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H04B 3/23 (2006.01)

Patent

CA 2647253

A method, apparatus, system, and program, for evaluating communication signals exchanged between communicating devices through at least one communication path. The method comprises performing a similarity function or distance function to determine if the communication signals include at least one substantially similar pattern, and reporting an existence of a predetermined condition if it is determined in the performing that the communication signals include a substantially similar pattern. The predetermined condition can be, for example, an echo condition in a single talk or double talk condition, and the echo condition can be acoustical or electrical in origin. The method adapts features and techniques that have been used successfully in speech recognition for successful application in the echo detection and double talk contexts, and the similarity function preferably is based on cepstral correlation according to the invention.

Procédé, dispositif, système et programme d'évaluation de signaux de communication échangés entre dispositifs de communication via au moins un trajet de communication. Le procédé est le suivant: conduite de fonction de similarité ou de distance pour déterminer si les signaux de communication comprennent au moins un motif sensiblement similaire, et notification de l'existence d'un état préétabli s'il est déterminé dans l'exécution que les signaux de communication comprennent ce motif. L'état préétabli peut être, par exemple, un état d'écho dans une situation de signaux vocaux uniques ou de double parole, et l'état d'écho peut être d'origine acoustique ou électrique. Le procédé décrit adapte des fonctions et des techniques utilisées avec succès en reconnaissance vocale, et s'applique avec succès aux contextes d'échodétection et de signaux vocaux superposés, et la fonction de similarité repose de préférence sur la corrélation cepstrale selon l'invention

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