Nyquist - overcoming the limitations

R.F. McLean, S. Alsop, J.S. Fleming

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In digital signal analysis it is not possible by normal methods to retrieve components of frequency in excess of half the sampling frequency, generally referred to as the Nyquist frequency. Any frequency components that exist in excess of this value will give errors in their frequency determination because they will appear as false or 'aliased' signals. A new technique has been developed to unambiguously retrieve signals many thousands times greater than this hitherto stated limitation. A feature of the system is its ability to sample at low frequency and, without further sampling, be capable of unambiguously determining frequency components far in excess of the initial low-frequency sampling rates. Although the approach has its origins in the area of machinery condition monitoring it has applications in numerous other fields, such as lowering the bandwidth of frequency spectra within communication systems. The technique can also be used in reverse to synthesis high-frequency signals from transmitted lower frequencies.
LanguageEnglish
Pages1-20
Number of pages19
JournalJournal of Sound and Vibration
Volume280
Issue number1-2
DOIs
Publication statusPublished - Feb 2005

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Sampling
sampling
Signal analysis
Condition monitoring
low frequencies
Machinery
Communication systems
Nyquist frequencies
Bandwidth
signal analysis
machinery
telecommunication
bandwidth
synthesis

Keywords

  • nyquist frequency
  • digital signal analysis

Cite this

McLean, R.F. ; Alsop, S. ; Fleming, J.S. / Nyquist - overcoming the limitations. In: Journal of Sound and Vibration. 2005 ; Vol. 280, No. 1-2. pp. 1-20.
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McLean, RF, Alsop, S & Fleming, JS 2005, 'Nyquist - overcoming the limitations' Journal of Sound and Vibration, vol. 280, no. 1-2, pp. 1-20. https://doi.org/10.1016/j.jsv.2003.11.047

Nyquist - overcoming the limitations. / McLean, R.F.; Alsop, S.; Fleming, J.S.

In: Journal of Sound and Vibration, Vol. 280, No. 1-2, 02.2005, p. 1-20.

Research output: Contribution to journalArticle

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