Method, apparatus and computer program product of aliasing...

H - Electricity – 03 – M

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H03M 1/48 (2006.01)

Patent

CA 2576857

An improved encoder interface system, able to track absolute position at higher encoder velocities without aliasing. The device and related apparatus, method and computer program product can perform this operation without loss of precision or accuracy. The improved encoder interface system can predict the phase angle of the signal for each sampling iteration and then measure the angular difference between the predicted phase angle and the actual phase angle to account for acceleration. The predictive capacity of the system thereby minimizes the problem of aliasing. As a result of this technique, aliasing will only occur when the acceleration of the object being observed exceeds a certain threshold that, like the Nyquist frequency, is dependent on the sampling rate of the signal acquisition component. Importantly, in most applications, this acceleration limit greatly exceeds any possible acceleration that the system will undergo.

L'invention concerne un système d'interface codeur amélioré, capable de repérer une position absolue à des vitesses de codage élevées sans repliement. Le dispositif et l'appareil connexe, le procédé et le produit de programme informatique peuvent exécuter cette opération sans perte de précision ou d'exactitude. Ledit système d'interface codeur amélioré peut prédire le déphasage du signal pour chaque itération d'échantillonnage, puis mesurer la différence angulaire entre le déphasage prédit et le déphasage réel pour tenir compte de l'accélération. La capacité prédictive du système minimise ainsi le problème du repliement. Il en résulte que le repliement ne surviendra que lorsque l'accélération de l'objet observé dépasse un certain seuil qui, comme la fréquence de Nyquist, est fonction de la vitesse d'échantillonnage du composant d'acquisition de signaux. A souligner que, dans la plupart des applications, cette limite d'accélération dépasse largement toutes les accélérations possibles que le système subira.

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