observer

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observer

[əb′zər·vər]
(control systems)
A linear system B driven by the inputs and outputs of another linear system A which produces an output that converges to some linear function of the state of system A. Also known as state estimator; state observer.
References in classic literature ?
The effect upon the observer was rather something in the nature of a bee or wasp.
One single hypothesis of the observers of Long's Peak could ever be realized, that which foresaw the case of the travelers (if still alive) uniting their efforts with the lunar attraction to attain the surface of the disc.
I think no better evidence of this can be required than that the two most experienced observers who have ever lived, namely, Kolreuter and Gartner, should have arrived at diametrically opposite conclusions in regard to the very same species.
Throughout the whole of this movement, which occupied an hour of time, the trapper had stood apart, leaning on his rifle, with the aged hound slumbering at his feet, a silent but attentive observer of all that passed.
As to the nature of these friendships, which seemed so many to the eye of the superficial observer, they were of various kinds, and while the girl pursued them with enthusiasm and ardor, they left her unsatisfied and heart-hungry; they were never intimacies such as are so readily made by shallow natures.
Jennings's suggestion; and she could not help believing herself the nicest observer of the two;--she watched his eyes, while Mrs.
Every unbiased observer may infer, without danger of mistake, and at the same time without meaning to reflect on either party, or any individuals of either party, that, unfortunately, PASSION, not REASON, must have presided over their decisions.
A close observer might have gathered that the topic was distasteful; but the doctor carried it off gaily.
A casual observer might have thought "and there ends the dialogue
An observer with anything of an eye for national types would have had no difficulty in determining the local origin of this undeveloped connoisseur, and indeed such an observer might have felt a certain humorous relish of the almost ideal completeness with which he filled out the national mould.
Once returned from the abysms of the utter North to that little house upon the outskirts of Meudon, it was not the philosopher, the daring observer, the man of iron energy that imposed himself on his family, but a fat and even plaintive jester, a farceur incarnate and kindly, the co-equal of his children, and, it must be written, not seldom the comic despair of Madame Lavalle, who, as she writes five years after the marriage, to her venerable mother, found "in this unequalled intellect whose name I bear the abandon of a large and very untidy boy.
Differing one from another in natures and moods so greatly as they did, they yet formed, bending, a curiously uniform row--automatic, noiseless; and an alien observer passing down the neighbouring lane might well have been excused for massing them as "Hodge".