Zobel's signature in his draughtsmanlike hand as it appears on a patent application
Otto Julius Zobel (October 20, 1887 – January 1970) was an electrical engineer who worked for the American Telephone & Telegraph Company (AT&T) in the early part of the 20th century. Zobel's work on filter design was revolutionary and led, in conjunction with the work of John R. Carson, to significant commercial advances for AT&T in the field of frequency-division multiplex (FDM) telephone transmissions.[1]
Although much of Zobel's work has been superseded by more modern filter designs, it remains the basis of filter theory and his papers are still referenced today. Zobel invented the m-derived filter[2]
and the constant-resistance filter,[3] which remains in use.
Zobel and Carson helped to establish the nature of noise in electric circuits, concluding that—contrary to mainstream belief[4]—it is not even theoretically possible to filter out noise entirely and that noise will always be a limiting factor in what is possible to transmit.[5] Thus, they anticipated the later work of Claude Shannon, who showed how the theoretical information rate of a channel is related to the noise of the channel.
OttoJuliusZobel (October 20, 1887 – January 1970) was an electrical engineer who worked for the American Telephone & Telegraph Company (AT&T) in the...
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This class of filter was later to be dubbed the constant k filter by OttoZobel working for AT&T in New York. The sharpness of transition from the passband...
affinity by free energy. Enigma machine first produced commercially. OttoJuliusZobel of Bell Labs describes the type of signal processing filter sections...
Campbell was a key contributor to this new filter theory, as was OttoJuliusZobel. They and many colleagues worked at the laboratories of Western Electric...
(Czechoslovakia, 1909–1977) Eugene Znosko-Borovsky (Russia, France, 1884–1954) Leo Zobel (Slovakia, 1895–1962) Alexander Zubarev (Ukraine, born 1979) Nikolai Zubarev...
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include The English Concert conducted by Harry Bicket, her accompanist David Zobel, the Brentano String Quartet, and the Philadelphia Orchestra conducted by...
Justin (December 1, 2020). "Universal And James Wan Tap 'Overlord' Director Julius Avery To Direct New 'Van Helsing' Movie". Deadline Hollywood. Retrieved...
David Alan Grier, Nancy Marchand, Allan Arbus, Edward Winter, Richard Zobel, Robert Irvin Elliott, Beatrice Winde, Art Hindle, Priscilla Pointer Light...
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the construction of the high-rise at the Elsenbrücke. The site at Fanny-Zobel-Straße 13–21 is situated between the Treptowers and the TwinTowers. It remains...
"Stor Sølv – Danmarks Kaninavlerforenings Avlerkatalog". kaniner.dk. "Stor Zobel – Danmarks Kaninavlerforenings Avlerkatalog". kaniner.dk. "The Giza White...
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