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| View Original: | Aliasing-folding.svg (300x200) | |||
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| Keywords: Aliasing-folding.svg aliasing showing folding frequency and periodicity Frequencies above Æ’<sub>s</sub>/2 the Nyquist frequency have an alias below Æ’<sub>s</sub>/2 whose value is given by this graph See Spectral imaging of the atmosphere by G G Shepherd Figure 2 9 a http //books google com/books id E6TgvVv3OXsC pg PA43 p 43 for similar diagram own v 26em Nils R Barth 2009-04-23 Other versions <gallery> File Aliasing-folding-1-period svg File Aliasing-folding-1-period svg File Aliasing-folding png File Aliasing-folding png </gallery> v 26em Graph of aliasing frequencies Triangle wave Set terminal set terminal svg enhanced size 300 200 fs 10 set samples 1001 high quality set border 31 linewidth 3 thin border set output aliasing-folding svg Ranges set xrange - 2 2 2 2 cycles with room for labels set xtics \ 0 0 \ fs/4 25 fs/2 5 3fs/4 75 fs 1 \ 5fs/4 1 25 3fs/2 1 5 7fs/4 1 75 2fs 2 \ Key feature fold is at 5; add 25 for reference set yrange - 1 1 1 Slight headroom from max of 1 set ytics \ 0 0 fs/4 5 fs/2 1 \ Corresponding y values Zero axes and grid as guidelines no key self-explanatory set zeroaxis set grid unset key Define and plot function tri x acos cos 2 pi x /pi normalized triangle wave plot tri x Aliasing | ||||
