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 ?
Weston, however, too eager to be very observant, too communicative to want others to talk, was very well satisfied with what she did say, and soon moved away to make the rest of his friends happy by a partial communication of what the whole room must have overheard already.
I do not mean to say that I am particularly observant or quick-sighted in general, but in such a case I am sure I could not be deceived.
He was steady, observant, moderate, candid; never run away with by spirits or by selfishness, which fancied itself strong feeling; and yet, with a sensibility to what was amiable and lovely, and a value for all the felicities of domestic life, which characters of fancied enthusiasm and violent agitation seldom really possess.
His deep, oval-shaped eyes were fixed upon the flames, but behind the superficial glaze seemed to brood an observant and whimsical spirit, which kept the brown of the eye still unusually vivid.
The Jew, perfectly understanding the hint, retired to fill it: previously exchanging a remarkable look with Fagin, who raised his eyes for an instant, as if in expectation of it, and shook his head in reply; so slightly that the action would have been almost imperceptible to an observant third person.
remarked Mr Boffin, observant of the Secretary's face and again addressing him.
This past weekend, I did something that few Sabbath observant Jews ever do: I went to a restaurant on Shabbat.
In a statement issued here, the Commission said the state institutions of higher education are places where students are expected to be tolerant and strict observant of law.
A Texas prison inmate who won the right to receive kosher food and have it provided to all observant Jewish inmates in the state has dropped his 12-year-old federal lawsuit against the prison system.
The number of hotels in Turkey serving strictly halal observant tourists could reach 100 by 2017.
But it wasn't until mid-20th-century America that there was a full-fledged, organized movement of Jews who moved from less observant to more observant--and a name for them.
A Companion to Observant Reform in the Late Middle Ages and Beyond