A host apparatus includes an ultrasound receiving unit receiving an ultrasound signal from a pointing apparatus and outputting an electric signal. A controlling unit calculates a position of a pointer on a display screen corresponding to a position of the pointing apparatus based on the electric signal...http://www.google.fr/patents/US7301530?utm_source=gb-gplus-shareBrevet US7301530 - Pointer control method, pointing apparatus, and host apparatus therefor
Pointer control method, pointing apparatus, and host apparatus therefor
