H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 9/08 (2006.01)
Patent
CA 2394342
The invention relates to a real time processing and management method for canceling out the echo between a loudspeaker (HP) and a microphone (M) of a computer terminal. Said method consists of establishing the loudspeaker signal or the microphone signal as a reference signal and synchronizing (A) the other signal with said reference signal, and (B) synchronizing the acquisition and audio reestablishment tasks. The delay that exists (rej) between the other signal and the reference signal is measured (C) and the existing delay value (rej) is validated (D) in order to control the delay applied to the reference signal starting from the current delay (rej). The invention can be used for computer terminals which are equipped with multi-tasks operating systems.
L'invention concerne un procédé temps réel de traitement et de gestion pour l'annulation d'écho entre haut-parleur (HP) et microphone (M) d'un terminal informatique. Il consiste à établir le signal de haut-parleur ou de micro comme signal de référence et à synchroniser (A) l'autre signal par rapport à ce dernier ainsi que (B) les tâches d'acquisition et de restitution audio. Le retard existant (re j) entre l'autre signal et le signal de référence est mesuré (C) et la valeur de retard existant (re j) est validée (D) pour commander le retard appliqué au signal de référence à partir du retard courant (re j). Application aux terminaux informatiques équipés de systèmes d'exploitation multi-tâches.
Deleam David
Le Tourneur Gregoire
France Telecom
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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