File:Chirp animation.gif
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Chirp_animation.gif (640 × 479 pixels, file size: 234 KB, MIME type: image/gif, looped, 11 frames, 5.5 s)
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Summary
| Description |
English: Chirp and impulse signals. |
| Date | |
| Source | Own work |
| Author | Andrew0090 |
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Source code (Octave)
% Generate a chirp signal animation
% To combine frames into an animated .gif file use:
% convert -delay 50 output/*.png chirp_animation.gif
N=513;
freqs=200;
t = linspace (-0.5, 0.5, N);
n=0;
lw = 2;
fs = 10;
fw = 'bold';
for dispersion = linspace (-0.001, 0.001, 11)
sig = zeros (freqs, N);
for f = 1:freqs
sig(f,:) = cos (f * pi * (t - dispersion * f));
end
subplot (2, 1, 1);
plot (t, sum (sig, 1), 'r', 'linewidth', lw);
axis([-0.5, 0.5, -100, 200]);
set(gca, 'fontsize', fs);
set(gca, 'FontWeight', fw);
set(gca, 'linewidth', lw)
set(gca, 'XTick', linspace (-0.5, 0.5, 5));
grid;
subplot (2, 1, 2);
hold off;
plot (t, sig(1,:), 'linewidth', lw);
hold on;
plot (t, sig(4,:) + 3, 'linewidth', lw);
plot (t, sig(16,:) + 6, 'linewidth', lw);
plot (t, sig(64,:) + 9, 'linewidth', lw);
plot ([1,1]*dispersion*1, [-1.2,1.2], 'r', 'linewidth', 6);
plot ([1,1]*dispersion*4, [1.8,4.2], 'r', 'linewidth', 6);
plot ([1,1]*dispersion*16, [4.8,7.2], 'r', 'linewidth', 6);
plot ([1,1]*dispersion*64, [7.8,10.2], 'r', 'linewidth', 6);
axis([-0.5, 0.5, -1.5, 10.5], 'labelx', 'tickx');
set(gca, 'fontsize', fs);
set(gca, 'FontWeight', fw);
set(gca, 'linewidth', lw)
set(gca, 'XTick', linspace (-0.5, 0.5, 5));
grid;
pause(0.5);
n = n+1;
filename=sprintf('output/%05d.png',n);
print(filename, '-S640,480');
end
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File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:52, 5 December 2013 | | 640 × 479 (234 KB) | Andrew0090 | Color and thickness of phase markers. |
| 03:38, 5 December 2013 |  | 640 × 479 (232 KB) | Andrew0090 | User created page with UploadWizard |
File usage
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Global file usage
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- Usage on ja.wikipedia.org
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Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.
Cover photo is available under {{::mainImage.info.license.name || 'Unknown'}} license.
Cover photo is available under {{::mainImage.info.license.name || 'Unknown'}} license.
Credit:
(see original file).
