| abstract |
A device (10) that measures the distance traveled, speed, and height jumped of a moving object or a person while running or walking. Accelerometers and rotational sensors are placed in the object or in the sole of one shoe, or in a wristwatch or the waist of the user, along with an electronic circuit that performs mathematical calculations to determine the distance and height. A radio frequency transmitter (12) sends the distance and height information to a wristwatch or other receiving unit. A radio frequency receiver (14) in the wristwatch or other unit is coupled to a microprocessor that calculates an output speed based upon step-distance and elapsed time, and the distance traveled of the runner from the sum of all previous steps. The output of the microprocessor is coupled to a display (18) that shows the distance traveled, speed, or height jumped. |