초록 ▼

A system for measuring the speed of a person while running or walking along a surface. A single acceleration sensor measures the acceleration in the forward direction and provides an acceleration signal which is amplified and subsequently sampled by analog to digital converter. The digital signal is

A system for measuring the speed of a person while running or walking along a surface. A single acceleration sensor measures the acceleration in the forward direction and provides an acceleration signal which is amplified and subsequently sampled by analog to digital converter. The digital signal is processed by a microprocessor which executes an algorithm that determines the stride length and the stride duration from the digitized acceleration signal and calculates the speed and the distance traversed. The information thus obtained is transmitted by means of a radio frequency transmitter and received by a radio frequency receiver in a watch or other device which comprises a display which can be viewed by the runner or walker. The speed and distance traversed is displayed on the display, along with other useful information, such as average speed, maximum speed, total distance traversed, calories expended, and heart beat.

대표청구항 ▼

1. 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 anal

1. 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.