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annotate m-toolbox/classes/@pz/rz2iir.m @ 44:409a22968d5e default

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Add unit tests
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Tue, 06 Dec 2011 18:42:11 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % RZ2IIR Return a,b IIR filter coefficients for a real zero designed using the bilinear transform.
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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4 % DESCRIPTION: RZ2IIR Return a,b IIR filter coefficients for a real zero
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5 % designed using the bilinear transform.
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6 %
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7 % CALL: [a,b] = rz2iir(z, fs)
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8 %
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9 % REMARK: This is just a helper function. This function should only be
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10 % called from class functions.
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11 %
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12 % INPUT: z - zero object
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13 % fs - the sample rate for the filter
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14 %
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15 % VERSION: $Id: rz2iir.m,v 1.7 2011/02/18 16:48:54 ingo Exp $
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16 %
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17 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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18
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19 function varargout = rz2iir(varargin)
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20
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21 z = varargin{1};
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22 fs = varargin{2};
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23
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24 f0 = z.f;
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25 w0 = f0*2*pi;
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26
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27 a(1) = (2*fs + w0) / w0;
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28 a(2) = (-2*fs + w0) / w0;
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29
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30 b(1) = 1;
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31 b(2) = 1;
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32
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33 varargout{1} = a;
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34 varargout{2} = b;
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35 end
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