# Harry Nyquist

**NyquistNyquist, Harry**

Henry Nyquist (, ; February 7, 1889 – April 4, 1976) was a Swedish-born American electronic engineer who made important contributions to communication theory.wikipedia

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### Communication theory

**communicationcommunications theorycommunication theorist**

Henry Nyquist (, ; February 7, 1889 – April 4, 1976) was a Swedish-born American electronic engineer who made important contributions to communication theory.

Harry Nyquist's 1924 paper, Certain Factors Affecting Telegraph Speed, contains a theoretical section quantifying "intelligence" and the "line speed" at which it can be transmitted by a communication system.

### Bell Labs

**Bell LaboratoriesBell Telephone LaboratoriesAT&T Bell Laboratories**

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.

In 1928 the thermal noise in a resistor was first measured by John B. Johnson, and Harry Nyquist provided the theoretical analysis; this is now termed Johnson noise.

### Hendrik Wade Bode

**Hendrik BodeBodeBode, Hendrik Wade**

In 1975 Nyquist received together with Hendrik Bode the Rufus Oldenburger Medal from the American Society of Mechanical Engineers.

He, along with Harry Nyquist, also developed the theoretical conditions applicable to the stability of amplifier circuits.

### Stuart Ballantine Medal

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."

### Rufus Oldenburger Medal

**Oldenburger MedalRufus Oldenburger laureateRufus T. Oldenburger Medal**

In 1975 Nyquist received together with Hendrik Bode the Rufus Oldenburger Medal from the American Society of Mechanical Engineers.

### Johnson–Nyquist noise

**thermal noiseJohnson noisenoise**

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.

He described his findings to Harry Nyquist, also at Bell Labs, who was able to explain the results.

### University of North Dakota

**North DakotaU. of North DakotaNorth Dakota University**

He entered the University of North Dakota in 1912 and received B.S. and M.S. degrees in electrical engineering in 1914 and 1915, respectively.

In the realm of science, notable UND alumni include important contributor to information theory Harry Nyquist, pioneer aviator Carl Ben Eielson, Arctic explorer Vilhjalmur Stefansson, engineer and NASA astronaut Karen L. Nyberg, and leading NASA manager John H. Disher.

### Amplifier

**amplifiersamplificationelectronic amplifier**

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.

Other advances in the theory of amplification were made by Harry Nyquist and Hendrik Wade Bode.

### Nyquist rate

**Nyquist sampling rateNyquist limitNyquist**

Long before Harry Nyquist had his name associated with sampling, the term Nyquist rate was used differently, with a meaning closer to what Nyquist actually studied.

### Nyquist frequency

**Nyquist limitNyquistN/2 different frequencies**

The Nyquist frequency, named after electronic engineer Harry Nyquist, is half of the sampling rate of a discrete signal processing system.

### Nyquist–Shannon sampling theorem

**sampling theoremNyquist-Shannon sampling theoremNyquist theorem**

This rule is essentially a dual of what is now known as the Nyquist–Shannon sampling theorem.

The name Nyquist–Shannon sampling theorem honours Harry Nyquist and Claude Shannon albeit the fact that it had already been discovered in 1933 by Vladimir Kotelnikov.

### Information theory

**information-theoreticinformation theoristinformation**

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.

Harry Nyquist's 1924 paper, Certain Factors Affecting Telegraph Speed, contains a theoretical section quantifying "intelligence" and the "line speed" at which it can be transmitted by a communication system, giving the relation

### Feedback

**feedback loopfeedback loopsfeedback control**

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.

Harry Nyquist at Bell Labs derived the Nyquist stability criterion for determining the stability of feedback systems.

### Nyquist stability criterion

**Nyquist plotNyquistNyquist criterion**

The Nyquist stability criterion can now be found in all textbooks on feedback control theory.

In control theory and stability theory, the Nyquist stability criterion or Strecker–Nyquist stability criterion, independently discovered by the German electrical engineer Felix Strecker at Siemens in 1930 and the Swedish-American electrical engineer Harry Nyquist at Bell Telephone Laboratories in 1932, is a graphical technique for determining the stability of a dynamical system.

### Nyquist filter

The filter is named after the Swedish–US engineer Harry Nyquist (1889–1976).

### Nyquist (programming language)

**Nyquist**

It is an extension of the XLISP dialect of Lisp, and is named after Harry Nyquist.

### Harlingen, Texas

**HarlingenHarlingen, TXHarlingen Texas**

Nyquist lived in Pharr, Texas after his retirement, and died in Harlingen, Texas on April 4, 1976.

### Fluctuation-dissipation theorem

**Fluctuation dissipation theoremfluctuations and dissipationfluctuation–dissipation theorem**

during his annus mirabilis and Harry Nyquist's explanation in 1928 of Johnson noise in electrical resistors.

### Electronic engineering

**Electronics and Communication EngineeringElectronics Engineeringelectronic engineer**

Henry Nyquist (, ; February 7, 1889 – April 4, 1976) was a Swedish-born American electronic engineer who made important contributions to communication theory.

### Värmland

**VarmlandVermlandProvince of Värmland**

Nyquist was born in the village Nilsby of the parish Stora Kil, Värmland, Sweden.

### Sweden

**SwedishSWEKingdom of Sweden**

Nyquist was born in the village Nilsby of the parish Stora Kil, Värmland, Sweden.

### United States

**AmericanU.S.USA**

He emigrated to the USA in 1907.

### Doctor of Philosophy

**Ph.D.PhDPh.D**

He received a Ph.D. in physics at Yale University in 1917.