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Re: [AUDITORY] Paper Request: Küpfmüller, 1924

Dear Alessandro and all,

Thank you, this is fantastic - much appreciated!

Also thanks to Elisabeth and Richard that kindly offered their help.

For those who wonder:
According to some of Gabor's comments in his seminal paper from 1946, the signal-processing version of the uncertainty principle was apparently known well before that time, and possibly before Heisenberg published his original quantum mechanical version in 1927. In this paper by Küpfmüller he derived a relationship between the bandwidth of a band-pass filter that is used to intercept rectangular telegraph pulses and the pulse width (p. 146), which is a corollary of the uncertainty principle. There may be earlier examples in print, but that's the first one I'm aware of.

All the best,
Adam.


Gabor, Dennis. Theory of communication. Part 1: The analysis of information. Journal of the Institution of Electrical Engineers-Part III: Radio and Communication Engineering, 93(26):429-457, 1946.

Heisenberg, W. Über den anschaulichen Inhalt der quantentheoretischen Kinematik und Mechanik. Zeitschrift für Physik, 43:172-198, 1927.




On Thu, Feb 27, 2025, at 10:30 PM, Alessandro Tavano wrote:
Dear Adam,

here is the paper, courtesy of the Library services of the Max Planck Institute.

Regards,
Alessandro



On 25. Feb 2025, at 07:56, Adam Weisser <adam_weisser@xxxxxxxxxxx> wrote:

Dear all,

Does anybody happen to have a copy of this paper:

Küpfmüller, K. Über Einschwingvorgange in Wellenfiltern (Transient phenomena in wave filters). Elektrische Nachrichten-Technik, 1:141 -152, 1924.

As far as I can tell, it's never been officially digitized.

Thank you in advance,
Adam.

Dr. Alessandro Tavano
a.tavano@xxxxxxxxxxxxxxxxxxxxxx
alessandro.tavano.office@xxxxxxxxx
https://orcid.org/0000-0002-2096-5542
https://github.com/peopleslab
Goethe University, Frankfurt am Main

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