Coherent error suppression in digital tachometers and the like

Details Coherent error suppression in digital tachometers and the like Coherent error suppression in digital tachometers and the like

1984-03-27

1986-12-30

Wise, Edward J.

Boots, shoes, and leggings

318327, 318618, 318632, 364565, G05B 1101

Patent

active

046334238

ABSTRACT:
Synchronous or coherent error appearing as one or more FM sidebands in the high frequency pulse signal of an incremental position encoding digital tachometer or the like and in an error signal having a magnitude representing the difference in velocity between that indicated by the high frequency signal and a desired velocity is suppressed in the error signal by a coherent error correction signal of varying magnitude which is combined with the error signal, is generated as a function of mechanical angular position and is identical from cycle to each cycle of the tachometer for the same mechanical angular position.

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"Understanding and Measuring Phase Noise and the Frequency Domain", (Cover and pp. 3-11), Application Notes 207, Hewlett Packard.

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