Boots – shoes – and leggings
Patent
1996-09-27
1998-05-26
Trammell, James P.
Boots, shoes, and leggings
7351439, 324160, 324167, 324179, G01P 300
Patent
active
057576769
ABSTRACT:
A method for measuring rotational speed in which a plurality of signal sources disposed along the periphery of a rotating system is monitored by a sensor, and the signals generated by the sensor are added by a counter to form a speed signal sum N. An associated time reference value A.sub.N is determined for each speed signal sum N, and the speed signal sum N and the time reference value A.sub.N for each signal source are saved in pairs in a storage medium. To determine the rotational speed, the time reference value A.sub.N-M which had been saved exactly one revolution before along with the speed signal sum N-M is then retrieved from the storage medium by a processor, which determines the difference of the time reference values A.sub.N and A.sub.N-M (the revolution time for one revolution of the rotating system), and then determines the reciprocal value of the revolution time, which represents the speed.
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patent: 4977525 (1990-12-01), Blackwell
Bonert, "Design of a High Performance Digital Tachometer with a Microcontroller", IEEE 1989.
Asea Brown Boveri AG
Assouad Patrick
Trammell James P.
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