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Steve Wozniak
Otto Julius Zobel
Filter design and theory pioneer
AT&T / Bell System · Bell Labs | Associates: Hendrik Wade Bode, George Ashley Campbell, John Renshaw Carson, Lloyd Espenschied, Marion Cameron Gray, Warren P. Mason, Sallie Pero Mead
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.
Although much of Zobel's work has been superseded by more modern filter designs, it remains the basis of filter theory and his papers are still referenced today.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… More on Wikipedia →
Timeline events (2)
Related concepts (4)
Composite image filter
A composite image filter is an electronic filter consisting of multiple image filter sections of two or more different types.
Lattice phase equaliser
A lattice phase equaliser or lattice filter is an example of an all-pass filter. That is, the attenuation of the filter is constant at all frequencies but the relative ph…
m-derived filter
m-derived filters or m-type filters are a type of electronic filter designed using the image method. They were invented by Otto Zobel in the early 1920s. This filter type…
Zobel network
Zobel networks are a type of filter section based on the image-impedance design principle. They are named after Otto Zobel of Bell Labs, who published a much-referenced p…