Everything about Harry Nyquist totally explained
Harry Nyquist (pron. [nʏ:kvɪst], not [naɪkwɪst] as often pronounced), (
February 7,
1889 –
April 4,
1976) was an important contributor to
information theory.
Biography
Nyquist was born in
Nilsby,
Sweden. He emigrated to the
USA in
1907 and entered the
University of North Dakota in
1912. He received a Ph.D. in physics at
Yale University in
1917. He worked at
AT&T's Department of Development and Research from 1917 to
1934, and continued when it became
Bell Telephone Laboratories in that year, until his retirement in 1954.
Nyquist received the
IRE Medal of Honor in 1960 for "fundamental contributions to a quantitative understanding of thermal noise, data transmission and negative feedback."
In October 1960 he was awarded the Stuart Ballantine Medal of the
Franklin Institute "for his theoretical analyses and practical inventions in the field of communications systems during the past forty years including, particularly, his original work in the theories of telegraph transmission, thermal noise in electric conductors, and in the history of feedback systems."
In 1969 he was awarded the
National Academy of Engineering's fourth Founder's Medal "in recognition of his many fundamental contributions to engineering."
Nyquist lived in
Pharr, Texas after his retirement, and died in
Harlingen, Texas on
April 4,
1976.
Technical contributions
As an engineer at Bell Laboratories, Nyquist did important work on thermal noise ("
Johnson–Nyquist noise"), the stability of
feedback amplifiers, telegraphy, facsimile, television, and other important communications problems. With
Herbert E. Ives, he helped to develop
AT&T's first facsimile machines that were made public in 1924. In 1932, he published a classical paper on stability of feedback amplifiers.
Nyquist stability criterion can now be found in all textbooks on feedback control theory.
His early theoretical work on determining the bandwidth requirements for transmitting information laid the foundations for later advances by
Claude Shannon, which led to the development of
information theory.
In
1927 Nyquist determined that the number of independent pulses that could be put through a telegraph channel per unit time is limited to twice the
bandwidth of the channel. Nyquist published his results in the paper
Certain topics in Telegraph Transmission Theory (
1928). This rule is essentially a
dual of what is now known as the
Nyquist–Shannon sampling theorem.
Further Information
Get more info on 'Harry Nyquist'.
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