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Certain Topics in Telegraph Transmission Theory in Bell Telephone Laboratories, August 1928, pp. 1-79 [NYQUIST'S SAMPLING THEOREM IN ORIGINAL WRAPPERS]

American Institute of Electrical Engineers, 1928. FIRST EDITION OF NYQUIST'S SAMPLING THEOREM, the process of converting a signal, here that of a telegraph, into a numerical sequence. ORIGINAL WRAPPERS. The sampling theorem, later refined by Claude Shannon and now known as the Nyquist-Shannon Theorem, is the principle by which engineers are able to digitize analog signals. In order that the analog-to-digital conversion produces a faithful reproduction of the original signal, slices - called samples - of the analog waves must be taken often, with the number taken per second known as the sampling rate. In essence, the samples are bridges that allow engineers to span analog signals (or continuous-time signals) and digital signals (or discrete-time signals). In 1924 and while working at Bell Telephone Laboratories, Harry Nyquist's work centered upon trying "to improve the speed of data transmission over telegraph wires, Nyquist isolated two key factors - signal shaping and choice of codes" (Origins of Cyberspace 163, p. 154). "The first is concerned with the best shape to be impressed on the transmitting medium so as to permit greater speed without undue interference either in the circuit under consideration or in those adjacent, while the latter deals with the choice of codes which will permit of transmitting a maximum amount of intelligence with a given number signal elements" (Nyquist. "Certain factors affecting telegraph speed," in Bell System Technical Journal 3, 1924, p. 324). We offer the 1924 paper separately. Building upon and refining his earlier work, Nyquist's 1928

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Atticus Rare Books
[West Branch, IA, U.S.A.]

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