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rz2iir

PURPOSE ^

RZ2IIR Return a,b IIR filter coefficients for a real zero designed using the bilinear transform.

SYNOPSIS ^

function varargout = rz2iir(varargin)

DESCRIPTION ^

 RZ2IIR Return a,b IIR filter coefficients for a real zero designed using the bilinear transform.
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 DESCRIPTION: RZ2IIR Return a,b IIR filter coefficients for a real zero
              designed using the bilinear transform.

 CALL:        [a,b] = rz2iir(z, fs)

 REMARK:      This is just a helper function. This function should only be
              called from class functions.

 INPUT:       z  - zero object
              fs - the sample rate for the filter

 VERSION:     $Id: rz2iir.m,v 1.4 2008/09/04 15:29:31 ingo Exp $

 HISTORY:     18-02-2003 Hewitson
                 Creation

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CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SUBFUNCTIONS ^

SOURCE CODE ^

0001 % RZ2IIR Return a,b IIR filter coefficients for a real zero designed using the bilinear transform.
0002 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0003 %
0004 % DESCRIPTION: RZ2IIR Return a,b IIR filter coefficients for a real zero
0005 %              designed using the bilinear transform.
0006 %
0007 % CALL:        [a,b] = rz2iir(z, fs)
0008 %
0009 % REMARK:      This is just a helper function. This function should only be
0010 %              called from class functions.
0011 %
0012 % INPUT:       z  - zero object
0013 %              fs - the sample rate for the filter
0014 %
0015 % VERSION:     $Id: rz2iir.m,v 1.4 2008/09/04 15:29:31 ingo Exp $
0016 %
0017 % HISTORY:     18-02-2003 Hewitson
0018 %                 Creation
0019 %
0020 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0021 
0022 function varargout = rz2iir(varargin)
0023 
0024   %%% Check if this is a call for parameters
0025   if utils.helper.isinfocall(varargin{:})
0026     varargout{1} = getInfo(varargin{3});
0027     return
0028   end
0029   
0030   z  = varargin{1};
0031   fs = varargin{2};
0032   
0033   f0 = z.f;
0034   w0 = f0*2*pi;
0035 
0036   a(1) = (2*fs + w0) / w0;
0037   a(2) = (-2*fs + w0) / w0;
0038 
0039   b(1) = 1;
0040   b(2) = 1;
0041 
0042   varargout{1} = a;
0043   varargout{2} = b;
0044 end
0045 
0046 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0047 %                               Local Functions                               %
0048 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0049 
0050 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0051 %
0052 % FUNCTION:    getInfo
0053 %
0054 % DESCRIPTION: Get Info Object
0055 %
0056 % HISTORY:     11-07-07 M Hewitson
0057 %                Creation.
0058 %
0059 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0060 
0061 function ii = getInfo(varargin)
0062   if nargin == 1 && strcmpi(varargin{1}, 'None')
0063     sets = {};
0064     pl   = [];
0065   else
0066     sets = {'Default'};
0067     pl   = getDefaultPlist;
0068   end
0069   % Build info object
0070   ii = minfo(mfilename, 'pz', '', utils.const.categories.internal, '$Id: rz2iir.m,v 1.4 2008/09/04 15:29:31 ingo Exp $', sets, pl);
0071 end
0072 
0073 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0074 %
0075 % FUNCTION:    getDefaultPlist
0076 %
0077 % DESCRIPTION: Get Default Plist
0078 %
0079 % HISTORY:     11-07-07 M Hewitson
0080 %                Creation.
0081 %
0082 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0083 
0084 function plo = getDefaultPlist()
0085   plo = plist();
0086 end
0087

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