Ralph Hartley - Article Index

Encyclopedia - 1970: Encyclopedia - 1970
1970 (MCMLXX) was a common year starting on Thursday. 1970 is the Unix epoch time. 1970 - Events. January 1 - Construction begins on A...   » Read the article

Encyclopedia - Bell Labs: Encyclopedia - Bell Labs
Bell Telephone Laboratories Inc., also known as Bell Labs and AT&T Bell Laboratories, was the research and development arm of the US ...   » Read the article

Encyclopedia - Ban Information: Encyclopedia - Ban Information
A ban, sometimes called a hartley, is a logarithmic unit which measures information or entropy, based on base 10 logarithms and powers of...   » Read the article

Encyclopedia - Information Theory: Encyclopedia - Information Theory
Information theory is the mathematical theory of data communication and storage, generally considered to have been founded in 1948 by Cla...   » Read the article

Encyclopedia - 1888: Encyclopedia - 1888
1888 is a leap year starting on Sunday (click on link for calendar). In Germany, 1888 is known as the 1888 Year of Three Emperors. Canad...   » Read the article

Encyclopedia - 1970: Encyclopedia Ii - 1970 - Events
1970 - January. January 1 - Construction begins on Arcosanti, by Paolo Soleri, in Mayer, Arizona, located 65 miles north of Phoenix, A...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Information Theory - Basic Concepts For Discrete Channels
Information theory - Self-information. Shannon defined a measure of information content called the self-information or surprisal of a m...   » Read the article

Encyclopedia - Bell Labs: Encyclopedia Ii - Bell Labs - History
In 1925, Walter Gifford, then president of AT&T, established Bell Telephone Laboratories Inc as a separate entity which took over wor...   » Read the article

Encyclopedia - Shannon–hartley Theorem: Encyclopedia Ii - Shannon–hartley Theorem - Introduction
Shannon–Hartley theorem - Noisy channel coding theorem. Claude Shannon's noisy channel coding theorem (1948) describes the maximum po...   » Read the article

Encyclopedia - 1888: Encyclopedia Ii - 1888 - Births
1888 - January-March. January 1 - Victor Goldschmidt, Swiss geochemist (d. 1947) January 8 - Matt Moore, Irish-born actor (d. 1960) Ja...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Channel Capacity
Let us return for the time being to our consideration of the communications process over a discrete channel. At this time it will be help...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Continuous Channels
Shannon information is appropriate for measuring uncertainty over a discrete space. Its basic measures have been extended by analogy to c...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Basic Concepts For Discrete Channels
Information theory - Self-information. Shannon defined a measure of information content called the self-information or surprisal of a m...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Mathematical Preliminaries
Information theory is based on and intimately connected with probability theory. In information theory, logarithms are used extensively. ...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Source Theory
Any process that generates successive messages can be considered a source of information. Sources can be classified in order of increasin...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Fundamental Theorem
Information theory - Statement Noisy-Channel Coding Theorem. 1. For every discrete memoryless channel, the channel capacity h...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - History
Claude E. Shannon (1916–2001) founded information theory with his classic paper "A Mathematical Theory of Communication", published in ...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Related Concepts
Information theory - Measure Theory. Here is an interesting and illuminating connection between information theory and measure theory: ...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Applications
Information theory - Coding Theory. Coding theory is the most important and direct application of information theory. It can be subdivi...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Information Theory - History
Claude E. Shannon (1916–2001) founded information theory with his classic paper "A Mathematical Theory of Communication", published in ...   » Read the article

Encyclopedia - Shannon–hartley Theorem: Encyclopedia Ii - Shannon–hartley Theorem - Capacity Of The Additive White Gaussian Noise Channel
Considering all possible multi-level and multi-phase encoding techniques, the theorem gives that the theoretical maximum rate of clean (o...   » Read the article

Encyclopedia - Shannon–hartley Theorem: Encyclopedia Ii - Shannon–hartley Theorem - Capacity Of The Additive White Gaussian Noise Channel
Considering all possible multi-level and multi-phase encoding techniques, the theorem gives that the theoretical maximum rate of clean (o...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Information Theory - Applications
Information theory - Coding Theory. Coding theory is the most important and direct application of information theory. It can be subdivi...   » Read the article

Encyclopedia - 1970: Encyclopedia Ii - 1970 - Births
1970 - January. January 6 - Gabrielle Reece, American volleyball player and model January 13 - Keith Coogan, American actor January 13...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Information Theory - Mathematical Preliminaries
Information theory is based on and intimately connected with probability theory. In information theory, logarithms are used extensively. ...   » Read the article

Encyclopedia - 1970: Encyclopedia Ii - 1970 - Deaths
1970 - January. January 4 - Jean-Etienne Valluy, French general (b. 1899) January 5 - Max Born, German physicist, Nobel Prize laureate...   » Read the article

Encyclopedia - Bell Labs: Encyclopedia Ii - Bell Labs - Basis
The work done by Bell Labs was broadly divided into three categories: research, systems engineering, and development. Research created th...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Information Theory - Continuous Channels
Shannon information is appropriate for measuring uncertainty over a discrete space. Its basic measures have been extended by analogy to c...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Information Theory - Channel Capacity
Let us return for the time being to our consideration of the communications process over a discrete channel. At this time it will be help...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Information Theory - Fundamental Theorem
Information theory - Statement Noisy-Channel Coding Theorem. 1. For every discrete memoryless channel, the channel capacity h...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Information Theory - Source Theory
Any process that generates successive messages can be considered a source of information. Sources can be classified in order of increasin...   » Read the article

Encyclopedia - Information Theory: Encyclopedia Ii - Information Theory - Related Concepts
Information theory - Measure Theory. Here is an interesting and illuminating connection between information theory and measure theory: ...   » Read the article