Harry Nyquist
Harry Nyquist (pron. , not) (February 7th 1889 - April 4th 1976) was an important contributor with the Information theory and the Automatique.
It was born in Nilsby in Sweden. He emigrated towards the the United States in 1907 and entered to the university of the North Dakota in 1912. Five years later, it was accepted as doctor in Physique at the university of Yale. After having worked of 1917 with 1934 at AT&T, it left for the Laboratoires Beautiful.
With the Beautiful Labs , it made research on the thermal Bruit also called “noise of Johnson-Nyquist” and on the stability of the buckled amplifiers (see Diagramme of Nyquist).
Its theoretical work on the determination of the band-width necessary to the transmission of information, published in the article Some factors affecting telegraph speed poses the bases for the searchs for Claude Shannon which will bring the Information theory.
In 1927 Nyquist determines that a signal Analogique must be sampled with at least twice more the high frequency the component if one wants to convert it into a signal Numérique corresponding. This result, known under the name of Theorem of sampling of Nyquist-Shannon, was published in the article Some topics in Telegraph Transmission Theory (1928).
It took its retirement in 1954 and died in Harlingen in the Texas.
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