+
−% TOMIIR converts a pzmodel to an IIR filter using a bilinear transform.
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−%
+
−% DESCRIPTION: TOMIIR converts a pzmodel to an IIR filter using a bilinear
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−%              transform.
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−%
+
−% CALL:        f = tomiir(pzm, fs); % construct for this sample frequency fs
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−%              f = tomiir(pzm, pl); % construct from plist
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−%
+
−% <a href="matlab:utils.helper.displayMethodInfo('pzmodel', 'tomiir')">Parameters Description</a>
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−%
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−% VERSION:     $Id: tomiir.m,v 1.18 2011/04/08 08:56:32 hewitson Exp $
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−%
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−
+
−function varargout = tomiir(varargin)
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−  
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−  %%% Check if this is a call for parameters
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−  if utils.helper.isinfocall(varargin{:})
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−    varargout{1} = getInfo(varargin{3});
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−    return
+
−  end
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−  
+
−  % Check output arguments number
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−  if nargout == 0
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−    error('### pzmodel/tomiir cannot be used as a modifier. Please give an output variable.');
+
−  end
+
−  
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−  % Collect input variable names
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−  in_names = cell(size(varargin));
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−  for ii = 1:nargin,in_names{ii} = inputname(ii);end
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−  
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−  % Collect all AOs
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−  [pzms, pzm_invars] = utils.helper.collect_objects(varargin(:), 'pzmodel', in_names);
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−  pls  = utils.helper.collect_objects(varargin(:), 'plist');
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−  
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−  % Store inhists to suppress intermediate history steps
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−  inhists = [pzms(:).hist];
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−  
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−  % Get default parameters
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−  pl = parse(pls, getDefaultPlist);
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−  
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−  % Decide on a deep copy or a modify
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−  pzms = copy(pzms, nargout);
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−  
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−  % Get fs
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−  fs = pl.find('fs');
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−  if nargin == 2
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−    if isnumeric(varargin{2})
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−      fs = varargin{2};
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−    end
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−  end
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−  
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−  si = size(pzms);
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−  f(si(1), si(2)) = miir();
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−  for kk = 1:numel(pzms)
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−    
+
−    % get a and b coefficients
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−    [a,b] = pzm2ab(pzms(kk), fs);
+
−    
+
−    % throws a warning if the model has a delay
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−    if(pzms(kk).delay~=0)
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−      disp('!!!  PZmodel delay is not used in the discretization')
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−    end
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−    % make MIIR filter
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−    f(kk) = miir(a,b,fs);
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−    f(kk).addHistory(getInfo, pl, pzm_invars(kk), inhists(kk));
+
−  end
+
−  
+
−  % Set output
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−  if nargout == numel(f)
+
−    % List of outputs
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−    for ii = 1:numel(f)
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−      varargout{ii} = f(ii);
+
−    end
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−  else
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−    % Single output
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−    varargout{1} = f;
+
−  end
+
−  
+
−end
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−
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−%                               Local Functions                               %
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−%
+
−% FUNCTION:    getInfo
+
−%
+
−% DESCRIPTION: Get Info Object
+
−%
+
−% HISTORY:     11-07-07 M Hewitson
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−%                Creation.
+
−%
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−
+
−function ii = getInfo(varargin)
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−  if nargin == 1 && strcmpi(varargin{1}, 'None')
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−    sets = {};
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−    pl   = [];
+
−  else
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−    sets = {'Default'};
+
−    pl   = getDefaultPlist;
+
−  end
+
−  % Build info object
+
−  ii = minfo(mfilename, 'pzmodel', 'ltpda', utils.const.categories.op, '$Id: tomiir.m,v 1.18 2011/04/08 08:56:32 hewitson Exp $', sets, pl);
+
−  ii.setModifier(false);
+
−end
+
−
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−%
+
−% FUNCTION:    getDefaultPlist
+
−%
+
−% DESCRIPTION: Get Default Plist
+
−%
+
−% HISTORY:     11-07-07 M Hewitson
+
−%                Creation.
+
−%
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−
+
−function plout = getDefaultPlist()
+
−  persistent pl;  
+
−  if exist('pl', 'var')==0 || isempty(pl)
+
−    pl = buildplist();
+
−  end
+
−  plout = pl;  
+
−end
+
−
+
−function plo = buildplist()
+
−  plo = plist();
+
−  
+
−  % FS
+
−  p = param({'fs', 'Frequency of the iir filter.'}, paramValue.DOUBLE_VALUE(1));
+
−  plo.append(p);
+
−  
+
−end
+
−