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 ?
So far, the ordinary observer; an extraordinary observer might have seen that the chin was very pointed and pronounced; that the big eyes were full of spirit and vivacity; that the mouth was sweet-lipped and expressive; that the forehead was broad and full; in short, our discerning extraordinary observer might have concluded that no commonplace soul inhabited the body of this stray woman- child of whom shy Matthew Cuthbert was so ludicrously afraid.
By attentively watching, the observer would then have perceived the other molecules of the mass, following the example of this central star, become likewise condensed by gradually accelerated rotation, and gravitating round it in the shape of innumerable stars.
If the observer had then specially directed his attention to one of the more humble and less brilliant of these stellar bodies, a star of the fourth class, that which is arrogantly called the Sun, all the phenomena to which the formation of the Universe is to be ascribed would have been successively fulfilled before his eyes.
It is impossible to study the several memoirs and works of those two conscientious and admirable observers, Kolreuter and Gartner, who almost devoted their lives to this subject, without being deeply impressed with the high generality of some degree of sterility.
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.
As James states, there is no difference, from the point of view of the outside observer, between voluntary and reflex movements.
This illustrates how love of the marvellous may mislead even so careful an observer as Fabre and so eminent a philosopher as Bergson.
Just as the work was ended the scowling eye of Ishmael's assistant caught a glimpse of the figure of the attentive observer of their movements.
In more fertile spots the observer would have come to the conclusion that one of those great herds of bisons which graze upon the prairie land was approaching him.
Hundreds of observers saw the flame that night and the night after about midnight, and again the night after; and so for ten nights, a flame each night.
The kind of civility that urban observers ascribe to
It is advisable here to make a remark which ought to be well considered by hasty observers.

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