U.S. Philips Corporation

Christoph Schiller

Mark A De Samber

Lambertus G J Fokkink

Erik P N Damen

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.

Method of and system for measuring performance during an exercise activity, and an athletic shoe for use in system

An X-ray examination apparatus (,), including an X-ray source (,) and an X-ray detector (,), is provided with an X-ray filter (,) which is arranged between the X-ray source and the X-ray detector. The X-ray filter (,) includes a plurality of filter elements (,) whose X-ray absorptivity can be adjusted by adjustment of a quantity of X-ray absorbing liquid (,) within the individual filter elements; a first end of individual filter elements communicates with the X-ray absorbing liquid whereas a second end communicates with an X-ray transparent liquid (,). The X-ray filter is preferably provided with a pressure control system for independent control of the liquid pressure in individual row ducts (,) and individual column ducts (,). Individual filter elements are preferably provided with a piston for separating the X-ray absorbing liquid from the X-ray transparent liquid.

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Eindhoven, Netherlands

Christoph Schiller