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Primary Examiner: Sloyan, Thomas J.
Assistant Examiner:
Attorney: Miller, Jr.; William G., MacKay; Raymond F.

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Title: Digital signal linearizer

Abstract: A digital signal linearizer for obtaining a linear digital output from a non-linear input. The output voltage of a thermocouple is converted to a train of pulses by a dual slope analog to digital converter. The number of pulses in the pulse train is proportional to the voltage and is linearized by a pulse rate multiplier programmed to vary over successive ranges of pulse counts corresponding to linear segments approximating the non-linear characteristic relating temperature and voltage. The linearized pulse train out of the multiplier is counted and displayed directly in temperature units.

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Inventors: Hoopes, Howard S. (Hatfield, PA, US)

Application Number: 432130
Filing Date: 1974-01-09
Publication_date: 1976-02-17
Assignee: Leeds & Northrup Company (North Wales, PA)
Primary Class(es): 341/140 324/99D, 341/167, 374/185, 702/86, 708/274
Other Classes:
US Patent Ref:

3349390	Oct, 1967	Glassman	340/347.
3617885	Nov, 1971	Wheable	340/347.
3662163	May, 1972	Miller et al.	340/347.
3668691	Jun, 1972	Sergo	340/347.
3685048	Aug, 1972	Pincus	340/347.
3686665	Aug, 1972	Elias et al.	340/347.
3699318	Oct, 1972	Underkoffler et al.	340/347.
3701145	Oct, 1972	Bergin	340/347.
3793630	Feb, 1974	Meijer	340/347.
3824585	Jul, 1974	Meijer	340/347.

Other Refs: Other References: Kollataj et al., "INTEGRATED CIRCUITS - - - ," Electronics, 3/1968, pp. 112-121.
Johnson, "DIGITAL SYSTEM - - -," Electronics, 3/1965, pp. 102-107.
Millman and Taub, "Pulse and Digital Circuits," McGraw-Hill Book Co., 1956, pp. 323-327.