Method for achieving high accuracy performance from conventional

Details Method for achieving high accuracy performance from conventional Method for achieving high accuracy performance from conventional

1975-10-23

1978-10-10

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

318604, 340347M, H03K 1302

Patent

active

041199588

ABSTRACT:
A synchro to digital converter which has a programmable read only memory (prom) that operates under control of a feed back counter and register. The prom is programmed to generate a digital signal proportional to the converter's inherent systematic error. The data stored in the prom is empirically derived by running an error (input angle vs. output angle) curve on the uncompensated converter. The corrected error signal from the prom is converted to analog form by conventional digital to analog converter means and subtracted from the closed loop steering signal which is derived from an approximating network thereby increasing the converter output accuracy to within better than 2 arc minutes.

REFERENCES:
patent: 3555254 (1971-01-01), Gerber
patent: 3641565 (1972-02-01), Ivers et al.
patent: 3668693 (1972-06-01), Eaton et al.
patent: 3705400 (1972-12-01), Cordes
patent: 3855466 (1974-12-01), Schwarz
patent: 3898648 (1975-08-01), Gariazzo
patent: 3906324 (1975-09-01), Smith
patent: 3911347 (1975-10-01), Hartung
patent: 3917930 (1975-11-01), Davey et al.
patent: 3976983 (1976-08-01), Moussie
patent: 4001557 (1977-01-01), Stephenson
Analog Devices, Inc., "Analog-Digital Conversion Handbook," pp. I-23 to I-26, 6/1972.

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