Patent ID: 6356856
Filing Date: 2002-03-12
Classification: A43B,A63B,G01C,G01P,G06K

Abstract:
A system for measuring performance during an exercise activity comprising:an acceleration sensor for measuring acceleration in a moving direction of a foot of an exerciser and for providing an acceleration signal in response to said acceleration; signal processing means comprising: means for analyzing a waveform of the acceleration signal and for determining from the analyzing a beginning and an end of movement of the foot during a stride made by the foot of the exerciser; means for single integrating and for double integrating the acceleration signal between said beginning and said end of movement in order to compute the speed of the foot as a function of time during the stride and the distance traversed by the foot as a function of time during the stride, respectively; means for computing an acceleration error by equalizing the acceleration error with the speed at the end of the movement of the foot divided by the time lapsed between the end and the beginning of the stride; means for computing a distance error by double integrating the acceleration error over said time lapsed between the end and the beginning of the movement of the foot; means for computing a corrected distance by subtracting the distance error from the distance traversed during the stride.