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 ?
There were other run-ways and alleys where rabbits were hanging in the air, and the wolf-pair prospected them all, the she-wolf leading the way, old One Eye following and observant, learning the method of robbing snares--a knowledge destined to stand him in good stead in the days to come.
She looked about her with observant eyes; not only noticing the tent which had been set up on the grass to accommodate the expected guests, but entering it, and looking at the waiters who were engaged in placing the luncheon on the table.
It would have been plain, only too plain, to far less observant eyes than Mrs.
The king of the country was also observant of it, and vowed that he who could discover whence the sounds proceeded, should have the title of "Universal Bell-ringer," even if it were not really a bell.
As the door closed on the two, the Sergeant, looking about among the women-servants in his observant way, noticed that while all the rest were merely frightened, Penelope was in tears.
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.
The Tajik Prosecutor General's Office has launched investigation into fake documents purporting to allow observant Muslims to wear a beard or hijab, reports Asia-plus news service on May 19.
Deeply spiritual and hauntingly observant, many of the poems draw on symbolism from nature and connect it to life's often near-mythical occurrences as well as examinations of language and its power.
That is why we need to be aware of their needs, not in an intrusive, overbearing way but in an observant, caring way.
New York, Mar 26 ( ANI ): Now, observant Jews in Israel can enjoy a 'rabbi-approved puff' during the week-long Passover holiday that starts from Monday.
CDATA[ The time has come to deal with the issue of the Jewish character of the State of Israel, and to regulate the fundamental principles underlying the status-quo in legislation, now that close to 40 MK's are religiously observant.