**Harry Nyquist**

Harry Nyquist (born Harry Theodor Nyqvist /ˈnaɪkwɪst/,
Swedish: [nyːkvɪst]; February 7, 1889 – April 4, 1976) was a
Swedish-born American electronic engineer who made important
contributions to communication theory.[1]

Contents

1 Personal life
2 Education
3 Career
4 Technical contributions
5 Terms named for Harry Nyquist
6 References
7 External links

Personal life[edit]
Nyquist was born in the Stora Kil parish of Nilsby, Värmland, Sweden.
He was the son of Lars Jonsson Nyqvist (b. 1847) and Katrina
Eriksdotter (b. 1857). His parents had seven children: Elin Teresia,
Astrid, Selma, Harry Theodor, Aemelie, Olga Maria, and Axel.[2] He
emigrated to the USA in 1907.
Education[edit]
He entered the
**University of North Dakota**

University of North Dakota in 1912 and received B.S.
and M.S. degrees in electrical engineering in 1914 and 1915,
respectively. He received a Ph.D. in physics at
**Yale University**

Yale University in
1917.
Career[edit]
He worked at AT&T's Department of Development and Research from
1917 to 1934, and continued when it became Bell Telephone Laboratories
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**

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." In 1975 Nyquist received
together with
**Hendrik Bode**

Hendrik Bode the
**Rufus Oldenburger Medal** from the
American Society of Mechanical Engineers.[3]
Nyquist lived in Pharr,
**Texas**

Texas after his retirement, and died in
**Harlingen, Texas**

Harlingen, Texas on April 4, 1976.
Technical contributions[edit]

Memorial to
**Harry Nyquist**

Harry Nyquist at the University of North Dakota's College
of Engineering and Mines

As an engineer at Bell Laboratories, Nyquist did important work on
thermal noise ("Johnson–Nyquist noise"),[4] 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 classic paper on stability of feedback
amplifiers.[5] The
**Nyquist stability criterion**

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 particular, 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, and published his
results in the papers Certain factors affecting telegraph speed
(1924)[6] and Certain topics in Telegraph Transmission Theory
(1928).[7] This rule is essentially a dual of what is now known as the
Nyquist–Shannon sampling theorem.
Terms named for Harry Nyquist[edit]

Nyquist rate: sampling rate twice the bandwidth of the signal's
waveform being sampled; sampling faster than this rate assures that
the waveform can be reconstructed accurately.
Nyquist frequency: half the sample rate of a system; signal
frequencies below this value are unambiguously represented.
Nyquist filter
Nyquist plot
Nyquist ISI criterion
Nyquist (programming language)
Nyquist stability criterion

References[edit]

^ "Harry Nyquist". Physics Today. 29 (6): 64. June 1976.
doi:10.1063/1.3023534. [permanent dead link]
^ "Sveriges befolkning 1900" [CD-ROM]: Nyqvist, Harry
^ "Rufus Oldenburger Medal". American Society of Mechanical Engineers.
Retrieved February 21, 2013.
^ H. Nyquist, "Thermal Agitation of Electric Charge in Conductors",
Phys. Rev., Vol. 32, pp. 110–113, 1928
^ H. Nyquist, "Regeneration theory", Bell System Technical Journal,
vol. 11, pp. 126–147, 1932
^ Nyquist, Harry. "Certain factors affecting telegraph speed". Bell
System Technical Journal, 3, 324–346, 1924
^ Nyquist, Harry. "Certain topics in telegraph transmission theory",
Trans. AIEE, vol. 47, pp. 617–644, Apr. 1928 Reprint as classic
paper in: Proc. IEEE, Vol. 90, No. 2, Feb 2002.

External links[edit]

IEEE Global History Network page about Nyquist
Nyquist criterion page with photo of Nyquist with
**John R. Pierce**

John R. Pierce and
Rudy Kompfner
K.J.Astrom: Nyquist and his seminal papers, 2005 presentation
Nyquist biography, p. 2

v
t
e

IEEE Medal of Honor

1951–1975

**Vladimir K. Zworykin**

Vladimir K. Zworykin (1951)
Walter R. G. Baker (1952)
John M. Miller (1953)
William L. Everitt (1954)
**Harald T. Friis** (1955)
John V. L. Hogan (1956)
**Julius Adams Stratton** (1957)
**Albert W. Hull**

Albert W. Hull (1958)
**Emory Leon Chaffee**

Emory Leon Chaffee (1959)
**Harry Nyquist**

Harry Nyquist (1960)
**Ernst Guillemin** (1961)
**Edward Victor Appleton**

Edward Victor Appleton (1962)
George C. Southworth (1963)
**John Hays Hammond Jr.**

John Hays Hammond Jr. (1963)
**Harold Alden Wheeler** (1964)
**Claude Shannon**

Claude Shannon (1966)
**Charles H. Townes**

Charles H. Townes (1967)
**Gordon Kidd Teal** (1968)
**Edward Ginzton** (1969)
**Dennis Gabor**

Dennis Gabor (1970)
**John Bardeen**

John Bardeen (1971)
**Jay Wright Forrester** (1972)
**Rudolf Kompfner** (1973)
**Rudolf E. Kálmán**

Rudolf E. Kálmán (1974)
**John R. Pierce**

John R. Pierce (1975)

Complete roster
1917–1925
1926–1950
1951–1975
1976–2000
2001–present

Authority control

WorldCat Identities
VIAF: 85211933
LCCN: n80015737
SN