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annotate m-toolbox/test/test_fft.m @ 30:317b5f447f3e database-connection-manager

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
parents f0afece42f48
children
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % Test fft() operator for AOs.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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2 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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3 % M Hewitson 19-04-07
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4 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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5 % $Id: test_fft.m,v 1.14 2009/07/24 13:38:19 luigi Exp $
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Daniele Nicolodi <nicolodi@science.unitn.it>
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6 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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7 function test_fft()
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8
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9
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Daniele Nicolodi <nicolodi@science.unitn.it>
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10 % Make test AOs
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Daniele Nicolodi <nicolodi@science.unitn.it>
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11 nsecs = 10;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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12 fs = 1000;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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13 pl = plist('nsecs', nsecs, 'fs', fs, 'tsfcn', 'sin(2*pi*7.433*t) + randn(size(t))');
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Daniele Nicolodi <nicolodi@science.unitn.it>
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14 a1 = ao(pl);
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15 a1 = a1.setName;
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16
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Daniele Nicolodi <nicolodi@science.unitn.it>
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17 % Take plain one sided
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Daniele Nicolodi <nicolodi@science.unitn.it>
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18 a2 = fft(a1,plist('type','plain'));
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Daniele Nicolodi <nicolodi@science.unitn.it>
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19 iplot(abs(a2), plist('XScales', {'All', 'lin'}));
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20
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Daniele Nicolodi <nicolodi@science.unitn.it>
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21 % Take abs of one-sided
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Daniele Nicolodi <nicolodi@science.unitn.it>
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22 a3 = abs(fft(a1,plist('type','one'))).^2;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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23 a4 = psd(a1, plist('Nfft', 10000, 'Win', specwin('Rectangular', 10000)));
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24
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25 % Plot ratio
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Daniele Nicolodi <nicolodi@science.unitn.it>
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26 rat = a3./a4;
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27
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28 iplot(rat, plist('YScales', 'lin'))
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29 iplot(a3,a4)
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30
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31 % Two-sided fft
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Daniele Nicolodi <nicolodi@science.unitn.it>
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32 a5 = fft(a1, plist('type', 'two'));
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33 iplot(abs(a5), plist('XScales', {'All', 'lin'}));
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34
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35 end
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Daniele Nicolodi <nicolodi@science.unitn.it>
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36 % END