1924
DOI: 10.1109/t-aiee.1924.5060996
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Certain Factors Affecting Telegraph Speed

Abstract: Review of the Subject.-In considering methods for in-the effect of codes differing in the number of "currentt values" creasing the speed of telegraph circuits, the engineer is confronted employed. By this is meant the number of diffcrent current values by the problem of transmitting over a circuit the maximum amount which are employed in a system in forming the different charactcrs. of intelligence using a given frequency range, without causing undue To illu-strate, an ordinary land line telegraph circuit mahe… Show more

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Cited by 113 publications
(51 citation statements)
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“…Hartley [12] and H. Nyquist [13] on the transmission of information. The information of order β contained in the observation of the event x i with respect to the random variable X is defined by H(X).…”
Section: Experiments and Discussionmentioning
confidence: 99%
“…Hartley [12] and H. Nyquist [13] on the transmission of information. The information of order β contained in the observation of the event x i with respect to the random variable X is defined by H(X).…”
Section: Experiments and Discussionmentioning
confidence: 99%
“…Four years later (in 1928), Hartley focused on the theme of the transmission of intelligence by a telegraph line and summarized his reflections in a paper titled "Transmission of Information" [22]. Hartley substantially resumes Nyquist's argument with a slight change of terminology: he calls "number of selection n" the "signal elements" and instead of the "current values m" he introduces the term "primary symbols s".…”
Section: Nyquist Hartley and The Dawn Of Informationmentioning
confidence: 99%
“…This ratio might be taken as a measure of the loss. It is found more convenient, however, to take the logarithm of the power ratio as a measure of the transmission loss [22]. In short, the choice of logarithmic base seems dictated mainly by practicality.…”
Section: Nyquist Hartley and The Dawn Of Informationmentioning
confidence: 99%
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“…Nyquist was trying to determine the bandwidth requirements for transmitting information over telegraph wires and postu lated that the bandwidth had to be twice the size of the amount of information being transmitted per unit time [4]. Extension of this concept led to the development of the famous Nyquist sampling theorem, which states that the sampling rate for accurate description of a transmitting wave has to be at least twice as fast as the frequency of the wave [5].…”
Section: How Small a Time Step? How Fine A Grid?mentioning
confidence: 99%