Method and system for digitizing handwriting

G - Physics – 08 – C

Patent

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G08C 21/00 (2006.01) G01S 5/22 (2006.01) G06F 3/033 (2006.01)

Patent

CA 2293411

A system and method for tracking a moving object very accurately at short ranges in general, and a handwriting input device such as a pen (106) in particular. The method is based on measuring times of arrival of ultrashort RF pulses transmitted (201) by the pen to an array of receivers (100-103). Dealing with the ultrashort events is done by "strobing" the pen position. To achieve the necessary resolution, on the order of 0.25 mm, the times of arrival of the pulses are determined by sampling the pulses digitally and fitting appropriate mathematical function to the sampled pulses. The time jitter is averaged over many sweeps, and a dedicated receiver is used for synchronization.

L'invention concerne un système et un procédé permettant de suivre, de manière très précise, un objet en mouvement sur de courtes distances, en général, et un dispositif d'entrée de caractères manuscrits tel qu'un stylo (106), en particulier. Le procédé se base sur la mesure du moment d'arrivée d'impulsions H.F. ultracourtes transmises (201) par le stylo à une série de récepteurs (100-103). Le traitement des événements ultracourts se fait par échantillonnage de la position du stylo. Pour obtenir la résolution nécessaire, de l'ordre de 0,25 mm, on détermine les moments d'arrivée des impulsions en effectuant un échantillonnage numérique des impulsions et en faisant correspondre une fonction mathématique appropriée aux impulsions échantillonnées. Le scintillement est calculé sur la moyenne de nombreux balayages, un récepteur spécialisé étant utilisé pour la synchronisation.

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