File:Aliasing-folding.svg

Original file (SVG file, nominally 300 × 200 pixels, file size: 16 KB)

Summary

Description
English: Graph of frequency aliasing, showing folding frequency and periodicity. Frequencies above ƒs/2 (the Nyquist frequency) have an alias below ƒs/2, whose value is given by this graph. See Spectral imaging of the atmosphere, by G. G. Shepherd, Figure 2.9(a), p. 43 for similar diagram.
Date
Source Own work
Author Nils R. Barth
Permission
(Reusing this file)
Nils R. Barth, the copyright holder of this work, hereby publishes it under the following license:
Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
In some countries this may not be legally possible; if so:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
SVG development
InfoField
 
The SVG code is valid.
 
This chart was created with Gnuplot.
 
This plot uses embedded text/digits.
Source code
InfoField
Gnuplot code
Source code 
# 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)

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

inception

23 April 2009

media type

image/svg+xml

checksum

9d3d2d940c0a47c73a28d17942649d4342af3248

determination method or standard: SHA-1

data size

16,312 byte

height

200 pixel

width

300 pixel

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current13:49, 9 February 2019Thumbnail for version as of 13:49, 9 February 2019300 × 200 (16 KB)Bob KReverted to version as of 18:57, 23 April 2009 (UTC)
13:13, 9 February 2019Thumbnail for version as of 13:13, 9 February 2019697 × 324 (50 KB)Bob KProvide a .svg version of Aliasing-folding.png
18:57, 23 April 2009Thumbnail for version as of 18:57, 23 April 2009300 × 200 (16 KB)NbarthMuch cleaner in Inkscape
15:26, 21 April 2009Thumbnail for version as of 15:26, 21 April 2009300 × 200 (15 KB)Nbarth{{Information |Description={{en|1=Graph of frequency aliasing, showing folding frequency.}} |Source=Own work by uploader |Author=Nbarth |Date=2009-04-21 |Permission= |other_versions= }} <!--{{Ima

The following 2 pages use this file:

Global file usage

The following other wikis use this file:

Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.

If the file has been modified from its original state, some details may not fully reflect the modified file.

Retrieved from "https://en.wikipedia.org/wiki/File:Aliasing-folding.svg"