Boots – shoes – and leggings
Patent
1988-03-21
1990-02-13
Lall, Parshotam S.
Boots, shoes, and leggings
324 83D, 324 83Q, 364486, G01R 2500, G01R 2902
Patent
active
049012550
ABSTRACT:
A method and apparatus for evaluating the performance of a device, such as a quadrature encoder, which generates at least two electrical wave train signals, each varying between first and second states and the two normally being out of phase one with the other. In the invention, four types of change of phase relation between the signals are distinguished from a succession of changes, the interval required for each type of phase change is timed and recorded, and a predetermined plurality of sets of records are accumulated. The mean time interval for a change of phase relation between the two wave train signals is computed from the accumulated plurality of sets of records and compared with the accumulated sets of records of timed intervals for determining the one type of phase change for which the difference from the mean time interval is the greatest. A number indicative of the phase duration of that type of change of phase which has the greatest difference from the mean time interval is then computed and used in deriving an encoder quality signal representative of the performance of the quadrature encoder generating the wave train signals.
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Fox Glenn B.
Jenrette William I.
Lynn John S.
Lall Parshotam S.
Lynn Electronics Corp.
McConnell Daniel E.
Teska Kevin J.
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