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annotate m-toolbox/classes/@miir/mkhighpass.m @ 0:f0afece42f48

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Import.
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % MKHIGHPASS return a high pass filter miir(). A Butterworth filter is used.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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4 % DESCRIPTION: MKHIGHPASS return a high pass filter miir().
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5 % A Butterworth filter is used.
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6 %
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7 % CALL: f = mkhighpass(f, pl)
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8 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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9 % VERSION: $Id: mkhighpass.m,v 1.9 2011/04/04 11:37:02 hewitson Exp $
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10 %
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11 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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12
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13 function f = mkhighpass(f, pl)
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14
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15 g = find(pl, 'gain');
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16 fc = find(pl, 'fc');
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Daniele Nicolodi <nicolodi@science.unitn.it>
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17 fs = find(pl, 'fs');
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Daniele Nicolodi <nicolodi@science.unitn.it>
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18 order = find(pl, 'order');
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19
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20 utils.helper.checkFilterOptions(pl);
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21
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22 % Build filter coefficients
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Daniele Nicolodi <nicolodi@science.unitn.it>
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23 [a, b] = butter(order, 2*fc(1)/fs, 'high');
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24
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25 % Set filter properties
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Daniele Nicolodi <nicolodi@science.unitn.it>
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26 f.name = 'highpass';
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Daniele Nicolodi <nicolodi@science.unitn.it>
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27 f.fs = fs;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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28 f.a = g.*a;
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29 f.b = b;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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30 f.histin = zeros(1,f.ntaps-1); % initialise input history
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31 f.histout = zeros(1,f.ntaps-1); % initialise output history
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32 end
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