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Characterisation of very low frequency oscillations in laser Doppler perfusion signals with a singular spectrum

David-Olivier Azulay1, Phil Brain, Stefan R Sultana

  • 1Pfizer Global Research and Development, Ramsgate Road, Sandwich CT13 9NJ, UK. david-olivier.azulay@pfizer.com

Microvascular Research
|March 9, 2011
PubMed

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Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...