view m-toolbox/classes/@pz/cz2iir.m @ 29:54f14716c721
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author
Daniele Nicolodi <nicolodi@science.unitn.it>
date
Mon, 05 Dec 2011 16:20:06 +0100 (2011-12-05)
parents
f0afece42f48
children
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+ − % CZ2IIR return a,b IIR filter coefficients for a complex zero designed using the bilinear transform.
+ − %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ − %
+ − % DESCRIPTION: CZ2IIR return a,b IIR filter coefficients for a complex zero
+ − % designed using the bilinear transform.
+ − %
+ − % CALL: [a,b] = cz2iir(z, fs)
+ − %
+ − % REMARK: This is just a helper function. This function should only be
+ − % called from class functions.
+ − %
+ − % INPUTS: z - zero object
+ − % fs - the sample rate for the filter
+ − %
+ − % VERSION: $Id: cz2iir.m,v 1.7 2011/02/18 16:48:54 ingo Exp $
+ − %
+ − %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ −
+ − function varargout = cz2iir(varargin)
+ −
+ − z = varargin{1};
+ − fs = varargin{2};
+ −
+ − f0 = z.f;
+ − q = z.q;
+ −
+ − w0 = f0*2*pi;
+ − w02 = w0^2;
+ −
+ − a(1) = (-q*w02/2 - 2*q*fs*fs - w0*fs) / (q*w02);
+ − a(2) = (-w02+4*fs*fs) / w02;
+ − a(3) = (-q*w02/2 - 2*q*fs*fs + w0*fs) / (q*w02);
+ −
+ − b(1) = 1;
+ − b(2) = -2;
+ − b(3) = -1;
+ −
+ − varargout{1} = a;
+ − varargout{2} = b;
+ − end
+ −