Karl Küpfmüller
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Karl Küpfmüller (October 6, 1897 in Nuremberg – December 26, 1977 in Darmstadt) was a German electrical engineer, who was prolific in the areas of communications technology, measurement and control engineering, acoustics, communication theory and theoretical electro-technology.
See the German wikipedia article for details [3].
| 1913-1919 | student of electrotechnics at the Ohm-Polytechnikum in Nuremberg |
| served in the military during World War I | |
| 1919-1921 | worked at the telegraph research division of the German Post in Berlin |
| 1921-1928 | lead engineer at the central laboratory of Siemens & Halske AG in Berlin |
| habilitation | |
| 1928-1935 | full professor of general and theoretical electrical engineering at the Technischen Hochschule in Danzig |
| 1935-1937 | same position in Berlin |
| 1937-1941 | director of communication technology R&D at the Siemens-Wernerwerk for telegraphy |
| 1941-1945 | director of the central R&D division at Siemens & Halske |
| honorary professor at the Technische Hochschule Berlin |
About 1928, he did the same analysis that Harry Nyquist did, to show that not more than 2B independent pulses per second could be put through a channel of bandwidth B. He did this by quantifying the time-bandwidth product k of various communication signal types, and showing that k could never be less than 1/2. From his 1931 paper (rough translation from the Swedish):[1]
- "The time law allows comparison of the capacity of each transfer method with various known methods. On the other hand it indicates the limits that the development of technology must stay within. One interesting question for example is where the lower limit for k lies. The answer is acquired by at least one power change being needed to achieve one signal. So the frequency range must be at least so wide that the settling time becomes less than the duration of a signal, and from this comes k=1/2. So we can never get below this value, no matter how technology develops."
[edit] References
- ^ Karl Küpfmüller, "Utjämningsförlopp inom Telegraf- och Telefontekniken," ("Transients in telegraph and telephone engineering"), Teknisk Tidskrift, no. 9 pp.153-160 and 10 pp.178-182, 1931. [1] [2]
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