Boots – shoes – and leggings
Patent
1990-03-09
1991-12-10
Smith, Jerry
Boots, shoes, and leggings
341110, 341145, G06F 305
Patent
active
050723588
ABSTRACT:
A process controller using a 16-bit microprocessor connected to a 10-bit analog to digital converter and a 10-bit digital to analog converter produces process correction signals having 16-bit accuracy. A raw sample of a process measurement signal is digitized to produce a first approximation of a process variable. The first approximation is stored and also reconverted to analog form as a processed analog sample. The processed analog sample is compared against the raw sample to generate and error signal corresponding to the difference. The error signal is amplified and digitized to produce a digitized refinement. The first approximation and the refinement are used to create first and second stage data words and a tabulated error value which are combined to produce enhanced digital data. Thereafter the enhanced digital data is used for calculation of a process correction command. The process correction command then is converted into high order and low order correction words, which are converted into coarse and fine analog correction signals. The coarse and fine analog correction signals are separately amplified and summed to produce a highly accurate control signal for the process.
REFERENCES:
patent: 4503421 (1985-03-01), Hareyame et al.
patent: 4673916 (1987-06-01), Kitamura et al.
patent: 4868571 (1989-09-01), Inamasu
MN5246 A/D Converter, data sheet published by Micro Networks, Apr. 1988, pp. 5-85 through 5-91.
Daytronic Corporation
Muir Patrick
Smith Jerry
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