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Butzer-2010a

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Article

Title Herbert Raabe's work in multiplex signal transmission and his development of sampling methods
Author Paul L. Butzer, Maurice M. Dodson, Paulo J S G Ferreira, J. R. Higgins, Otto Lange, Peter Seidler
Journal Signal Processing
Volume 90
Number 5
Pages 1436-1455
Month May
Year 2010
DOI [1]
Group
Group (before 2015) Signal Processing Laboratory
Indexed by ISI Yes

Abstract

This paper discusses the work of Herbert Raabe (1909-2004) and its significance in terms of sampling. Raabe's thesis of 1939 is a milestone in the development of sampling: Raabe built and analysed the first time-division multiplex system for telephony, a task that required of him a thorough understanding of sampling, including sampling with pulses of finite duration and sampling of low-pass and band-pass signals. This paper discusses his approach, its significance from the viewpoint of sampling, the generality of its conclusions, and also the milieu that lead to his remarkable achievements: the exceptional research climate existing in Berlin at the time Raabe's condition, the work of Harry Nyquist on telegraphy and the so-called Nyquist rate. An English translation of the sections of Raabe's dissertation more closely related to sampling is included as an appendix.