Harry Nyquist
Harry Nyquist (debate: Swedish [ : nʏ kvɪst ], English [ naɪkwɪst (*]) 7 February 1889 in Nilsby, Sweden ; † 4. April 1976 in Harlingen, Texas ) was a Swedish-American engineer of electrical engineering. He made an important contribution to information theory .
Harry Nyquist was born in Nilsby in Sweden and emigrated to the USA in 1907 . He studied electrical engineering at the University of North Dakota and received his PhD from Yale University in 1917 . He worked at AT&T and later at Bell Laboratories .
His first research dealt with thermal noise ( Johnson-Nyquist noise ) and with the stability of feedback amplifiers . He also researched the bandwidth required for information transmission. In 1927 he discovered that an analog signal must be sampled at more than twice the signal frequency in order to be able to reconstruct the analog output signal from the digital image of the signal. Nyquist published his research results in 1928 under the title Certain topics in Telegraph Transmission Theory , now known as the Nyquist-Shannon sampling theorem .
Nyquist's sampling theorem and his research into the required bandwidth formed an important basis for Claude Shannon's theoretical work, which ultimately led to the establishment of information theory .
No less important is Nyquist's contribution to control engineering; he coined the terms Nyquist plot ( locus ), Nyquist point and Nyquist criterion .
literature
- K. Jäger, F. Heilbronner (eds.): Lexikon der Elektrotechniker , VDE Verlag, 2nd edition from 2010, Berlin / Offenbach, ISBN 978-3-8007-2903-6 , p. 313
See also
Web links
- Harry Nyquist at the IEEE History Center (English)
- Harry Nyquist (IEEE page, English)
| personal data | |
|---|---|
| SURNAME | Nyquist, Harry |
| BRIEF DESCRIPTION | American physicist |
| DATE OF BIRTH | February 7, 1889 |
| PLACE OF BIRTH | Nilsby, Sweden |
| DATE OF DEATH | April 4th 1976 |
| Place of death | Harlingen, Texas , USA |