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 ?
He had replaced his neckerchief loosely, and had stood, keenly observant of me, biting a long end of it.
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.
Philip watched Sally; she sat with downcast eyes, calm, silent, and observant; and her long eye-lashes cast a pretty shadow on her cheek.
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.
'And that's your opinion?' remarked Mr Boffin, observant of the Secretary's face and again addressing him.
If the feline in your life is good - or observant - enough to be Cat Of The Week, send a photo and details to polly.hudson@mirror.co.uk
Wilmington, NC, April 30, 2019 --(PR.com)-- Blue Shark Vodka announces the launch of its Drink Responsibly Campaign, titled S.O.S., meaning Sensible, Observant and Safe.
This has been a cherished Christmas tradition that Kaplan, an observant Jew residing in the northern Israel town of Zichron Yaakov, has maintained in the decade since his mother, Toby, died at age 87.
She told a story of how observant her dad really is when, during a trip to the grocery, he saw her looking at a jar of Nutella and contemplating whether she should buy it or not.