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Ralph Hartley information


Ralph Hartley
Born(1888-11-30)November 30, 1888
Sprucemont, Nevada, U.S.
DiedMay 1, 1970(1970-05-01) (aged 81)
Summit, New Jersey, U.S.
NationalityAmerican
Alma materUniversity of Utah
Oxford University
Known forHartley function
Hartley modulator
Hartley oscillator
Hartley transform
Shannon–Hartley theorem
AwardsIEEE Medal of Honor (1946)
Scientific career
FieldsElectrical engineering

Ralph Vinton Lyon Hartley (November 30, 1888 – May 1, 1970) was an American electronics researcher. He invented the Hartley oscillator and the Hartley transform, and contributed to the foundations of information theory.

His legacy includes the naming of the hartley, a unit of information equal to one decimal digit, after him.

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Ralph Hartley

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Ralph Vinton Lyon Hartley (November 30, 1888 – May 1, 1970) was an American electronics researcher. He invented the Hartley oscillator and the Hartley...

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Hartley oscillator

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circuit was invented in 1915 by American engineer Ralph Hartley. The distinguishing feature of the Hartley oscillator is that the tuned circuit consists of...

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Hartley function

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The Hartley function is a measure of uncertainty, introduced by Ralph Hartley in 1928. If a sample from a finite set A uniformly at random is picked,...

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Hartley Sawyer

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Hartley Sawyer (born January 25, 1985) is an American actor. He is known for his roles as Kyle Abbott on the CBS Daytime soap opera The Young and the...

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Information theory

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field was originally established by the works of Harry Nyquist and Ralph Hartley, in the 1920s, and Claude Shannon in the 1940s.: vii  The field, in...

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Entropy in thermodynamics and information theory

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1870s are similar to the information entropy by Claude Shannon and Ralph Hartley, developed in the 1940s. The defining expression for entropy in the...

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Information

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field was fundamentally established by the works of Harry Nyquist and Ralph Hartley in the 1920s, and Claude Shannon in the 1940s. The field is at the intersection...

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History of information theory

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Shannon's work were two papers published in the 1920s by Harry Nyquist and Ralph Hartley, who were both still research leaders at Bell Labs when Shannon arrived...

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Bit

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communications machines such as teletypes and stock ticker machines (1870). Ralph Hartley suggested the use of a logarithmic measure of information in 1928. Claude...

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Bell Labs

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on earlier work in the field by Bell researchers Harry Nyquist and Ralph Hartley, but it greatly extended these. Bell Labs also introduced a series of...

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Hartley

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Look up Hartley or hartley in Wiktionary, the free dictionary. Hartley may refer to: Hartley, New South Wales Hartley, South Australia Electoral district...

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Hartley transform

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transform by Ralph V. L. Hartley in 1942, and is one of many known Fourier-related transforms. Compared to the Fourier transform, the Hartley transform has...

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List of electrical engineers

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Harrington Computational electromagnetics, method of moments (MoM) Ralph Hartley Electronics Caroline Haslett Founder of The Woman Engineer Oliver Heaviside...

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Timeline of information theory

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entropy, extending the Gibbs entropy to quantum mechanics 1928 – Ralph Hartley introduces Hartley information as the logarithm of the number of possible messages...

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University of Utah

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States Secretary of Veterans Affairs Ralph Hartley, A.B. 1909, invented the Hartley oscillator and the Hartley transform, recipient of the IEEE Medal...

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Data communication

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work in data transmission and information theory by Harry Nyquist, Ralph Hartley, Claude Shannon and others during the early 20th century, was done with...

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Elongated Man

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CW's live-action Arrowverse television series The Flash, portrayed by Hartley Sawyer. Elongated Man was created by writer John Broome and penciler Carmine...

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Units of information

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or the newer IEC binary prefixes (power-of-two prefixes). In 1928, Ralph Hartley observed a fundamental storage principle, which was further formalized...

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Vivien Leigh

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Vivien Leigh (/liː/ LEE; born Vivian Mary Hartley; 5 November 1913 – 8 July 1967), styled as Lady Olivier after 1947, was a British actress. She won the...

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List of eponymous laws

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intelligence." Hartley's law is a way to quantify information and its line rate in an analog communications channel. Named for Ralph Hartley (1888–1970)...

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History of the Internet

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in telecommunications technology was developed by Harry Nyquist and Ralph Hartley in the 1920s. Information theory, as enunciated by Claude Shannon in...

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List of scientific units named after people

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Agner Krarup Erlang fermi (fm), distance – Enrico Fermi hartley (Hart), information – Ralph Hartley Hounsfield scale, radiodensity – Godfrey Newbold Hounsfield...

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Marsden Hartley

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transcendentalists Henry David Thoreau and Ralph Waldo Emerson, inspired Hartley to view art as a spiritual quest. From 1900 to 1910, Hartley spent his summers in Lewiston...

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