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annotate m-toolbox/classes/@miir/mkallpass.m @ 33:5e7477b94d94 database-connection-manager

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % MKALLPASS returns an allpass filter miir().
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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4 % DESCRIPTION: MKALLPASS returns an allpass filter miir().
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5 %
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6 % CALL: f = mkallpass(f, pl)
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7 %
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8 % VERSION: $Id: mkallpass.m,v 1.2 2010/10/29 16:09:14 ingo Exp $
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9 %
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10 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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11
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12 function f = mkallpass(f, pl)
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13
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14 fs = find(pl, 'fs');
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15 method = find(pl, 'method');
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16 D = find(pl, 'delay');
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17 N = find(pl, 'N');
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18
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19 % Build filter coefficients
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20 switch method
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21 case 'thirlen'
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22 for k=0:N
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23 a(k+1) = (-1.0)^k * factorial(N)/(factorial(k)*factorial(N-k));
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24 for n=0:N
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25 a(k+1) = a(k+1) * (D-N+n)/(D-N+k+n);
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26 end
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27 end
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28
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29 a = a/sum(a);
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30 b(1) = 1;
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31
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32 otherwise
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33 error(['Unrecognised method [' method ']']);
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34 end
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35
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36 % Set filter properties
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37 f.name = 'bandpass';
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38 f.fs = fs;
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39 f.a = a;
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40 f.b = b;
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41 f.histin = zeros(1,f.ntaps-1); % initialise input history
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42 f.histout = zeros(1,f.ntaps-1); % initialise output history
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43 end
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44