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annotate m-toolbox/classes/@mfir/fromAO.m @ 42:f90d4f666cc7 database-connection-manager

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Cleanup
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 18:04:34 +0100
parents f0afece42f48
children
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % create FIR filter from magnitude of input AO/fsdata
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Daniele Nicolodi <nicolodi@science.unitn.it>
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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4 % FUNCTION: mfirFromAO
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5 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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6 % DESCRIPTION: create FIR filter from magnitude of input AO/fsdata
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7 %
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8 % CALL: f = mfirFromAO(a, pli, version, algoname)
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9 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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10 % PARAMETER: a: Analysis object
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11 % pli: Parameter list object
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12 % version: cvs version string
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13 % algoname: The m-file name (use the mfilename command)
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14 %
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15 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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16
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Daniele Nicolodi <nicolodi@science.unitn.it>
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17 function filt = fromAO(filt, pli)
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18
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19 import utils.const.*
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20
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21 VERSION = '$Id: fromAO.m,v 1.25 2011/08/15 11:37:04 hewitson Exp $';
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22 ii = mfir.getInfo('mfir', 'From AO');
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23 % Set the method version string in the minfo object
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24 ii.setMversion([VERSION '-->' ii.mversion]);
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25
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26 % Add default values
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27 pl = applyDefaults(ii.plists, pli);
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28
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29 % Get parameters
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30 a = find(pl, 'AO');
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31 N = find(pl, 'N');
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32 win = find(pl, 'Win');
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33 method = find(pl, 'method');
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34
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35 if ischar(win)
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36 name = win;
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37 wlen = pl.find('length');
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Daniele Nicolodi <nicolodi@science.unitn.it>
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38 % if the plist contains a window length (like history plists do), use
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Daniele Nicolodi <nicolodi@science.unitn.it>
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39 % it; otherwise use the filter order N.
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40 if isempty(wlen)
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41 wlen = N;
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42 end
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43
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44 if strcmpi(name, 'kaiser')
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45 psll = pl.find('psll');
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46 win = specwin(name, wlen, psll);
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47 else
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48 win = specwin(name, wlen);
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49 end
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50 end
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51
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52 % Check that a.data is a fsdata object
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53 if ~isa(a.data, 'fsdata')
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54 error('### Please use an analysis object with a fsdata data object to create a mfir object.');
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55 end
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56
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57 fs = a.data.fs;
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58 f = a.data.getX;
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59 xx = abs(a.data.getY);
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60
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61 ffm = f/(fs/2);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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62 switch lower(method)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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63 case 'frequency-sampling'
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Daniele Nicolodi <nicolodi@science.unitn.it>
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64 % check window
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Daniele Nicolodi <nicolodi@science.unitn.it>
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65 if ischar(win)
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66 if strcmpi(win, 'kaiser')
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67 win = specwin(win, N+1, win.psll);
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68 else
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69 win = specwin(win, N+1);
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70 end
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71 end
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72
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73 if length(win.win) ~= N+1
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74 warning('!!! resizing window function to match desired filter order.');
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75 if strcmpi(win.type, 'Kaiser')
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76 win = specwin(win.type, N+1, win.psll);
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77 else
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78 win = specwin(win.type, N+1);
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79 end
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80 end
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81 utils.helper.msg(msg.OPROC2, 'designing filter using frequency-sampling method [help fir2]');
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Daniele Nicolodi <nicolodi@science.unitn.it>
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82 mtaps = fir2(N, ffm, xx, win.win);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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83 case 'least-squares'
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84 error('### this design method is not working properly yet.');
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85 if mod(length(ffm),2)
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86 ffm = ffm(1:end-1);
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87 xx = xx(1:end-1);
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88 end
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89 utils.helper.msg(msg.OPROC2, 'designing filter using least-squares method [help firls]');
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90 mtaps = firls(N, ffm, xx);
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91 case 'parks-mcclellan'
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92 error('### this design method is not working properly yet.');
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93 utils.helper.msg(msg.OPROC2, 'designing filter using Parks-McClellan method [help firpm]');
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94 mtaps = firpm(N, ffm, xx);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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95 otherwise
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96 error('### unknown filter design method.');
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97 end
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98
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99 % Make mfir object
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100 filt.fs = fs;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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101 filt.a = mtaps;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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102 filt.gd = (filt.ntaps+1)/2;
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103 filt.histout = zeros(1,filt.ntaps-1);
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104
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105 % Override some properties of the input plist
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106 if isempty(pl.find('name'))
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107 pl.pset('name', sprintf('fir(%s)', a.name));
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108 end
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109 if isempty(pl.find('description'))
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110 pl.pset('description', a.description);
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111 end
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112
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113 % Add history
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114 pl.remove('AO'); % because the input AO goes in the history
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115 filt.addHistory(ii, pl, [], a.hist);
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116
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117 % Set object properties
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118 filt.setObjectProperties(pl);
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119
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120 end % function f = mfirFromAO(a, pli, version, algoname)