Mercurial > hg > ltpda

annotate m-toolbox/classes/+utils/@math/pfallps2.m @ 3:960fe1aa1c10 database-connection-manager

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Add LTPDADatabaseConnectionManager implementation. Java code
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % PFALLPS2 all pass filtering to stabilize TF poles and zeros.
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2 %
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3 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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4 % DESCRIPTION:
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5 %
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6 % All pass filtering in order to stabilize transfer function poles and
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7 % zeros. It inputs a partial fraction expanded discrete model and
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8 % outputs a pole-zero minimum phase system
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9 %
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10 % CALL:
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11 %
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12 % [resp,np] = pfallps2(ip,mresp,f)
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13 %
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14 % INPUTS:
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15 %
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16 % ip: are poles
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17 % f: is the frequancies vector in (Hz)
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18 % fs: is the sampling frequency in (Hz)
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19 %
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20 % OUTPUTS:
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21 %
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22 % resp: is the functions phase frequency response
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23 % np: are the new stable poles
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24 %
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25 % NOTE:
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26 %
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27 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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28 % VERSION: $Id: pfallpz.m,v 1.6 2009/06/10 15:47:00 luigi Exp $
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29 %
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30 % HISTORY: 12-09-2008 L Ferraioli
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31 % Creation
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32 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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33 function varargout = pfallps2(ip,mresp,f)
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34
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35 [a,b] = size(ip);
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36 if a<b
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37 ip = ip.'; % reshape as a column vector
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38 end
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39
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40 [a,b] = size(f);
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41 if a<b
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42 f = f.'; % reshape as a column vector
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43 end
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44
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45 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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46
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47 Nb = numel(ip);
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48 for nn = 1:Nb
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49
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50 p = ip(nn).poles;
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51
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52 % stabilizing poles
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53 sp = p;
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54 unst = real(p) > 0;
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55
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56 sp(unst) = conj(sp(unst));
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57
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58
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59
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60 pp = p(unst);
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61 psp = sp(unst);
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62 allpstr = '(1';
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63 for jj = 1:numel(sp(unst))
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64 allpstr = [allpstr sprintf('.*((s-%0.20d)./(s+%0.20d))',pp(jj),psp(jj))];
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65 end
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66 allpstr = [allpstr ')'];
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67
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68 funcell{nn} = allpstr;
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69
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70 end
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71
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72
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73 s = (1i*2*pi).*f;
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74 fullallprsp = 1;
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75
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76 for nn = 1:Nb
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77
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78 nterm = eval(funcell{nn});
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79 % willing to work with columns
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80 if size(nterm,2)>1
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81 nterm = nterm.';
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82 end
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83
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84 allprsp(:,nn) = nterm;
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85
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86 fullallprsp = fullallprsp.*nterm;
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87
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88 end
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89
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90 phs = angle(fullallprsp);
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91
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92 for kk=1:Nb
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93 resp(:,kk) = mresp(:,kk).*(cos(phs)+1i.*sin(phs));
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94 end
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95
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96
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97 % output
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98 if nargout == 1
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99 varargout{1} = resp;
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100 else
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101 error('Too many output arguments!')
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102 end
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103 end
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104
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105
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106
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107