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annotate m-toolbox/classes/@ao/mlpsd_mex.m @ 17:7afc99ec5f04 database-connection-manager

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Update ao_model_retrieve_in_timespan
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
parents f0afece42f48
children
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % MLPSD_MEX calls the ltpda_dft.mex to compute the DFT part of the LPSD algorithm
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Daniele Nicolodi <nicolodi@science.unitn.it>
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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4 % DESCRIPTION: MLPSD_MEX calls the ltpda_dft.mex to compute the DFT part of the
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Daniele Nicolodi <nicolodi@science.unitn.it>
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5 % LPSD algorithm
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Daniele Nicolodi <nicolodi@science.unitn.it>
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6 %
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7 % CALL: [S,Sxx,ENBW] = mlpsd_mex(x,f,r,m,L,fs,win,order,olap)
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8 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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9 % VERSION: $Id: mlpsd_mex.m,v 1.13 2011/05/22 22:22:50 mauro Exp $
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10 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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11 % HISTORY: 19-05-2007 M Hewitson
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Daniele Nicolodi <nicolodi@science.unitn.it>
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12 % Creation
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13 %
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14 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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15
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Daniele Nicolodi <nicolodi@science.unitn.it>
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16 function varargout = mlpsd_mex(varargin)
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17
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Daniele Nicolodi <nicolodi@science.unitn.it>
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18 import utils.const.*
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19
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20 utils.helper.msg(msg.PROC1, 'using ltpda_dft.mex to compute core DFT');
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21
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Daniele Nicolodi <nicolodi@science.unitn.it>
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22 % Get inputs
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Daniele Nicolodi <nicolodi@science.unitn.it>
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23 x = varargin{1};
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Daniele Nicolodi <nicolodi@science.unitn.it>
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24 f = varargin{2};
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Daniele Nicolodi <nicolodi@science.unitn.it>
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25 r = varargin{3};
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Daniele Nicolodi <nicolodi@science.unitn.it>
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26 m = varargin{4};
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Daniele Nicolodi <nicolodi@science.unitn.it>
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27 L = varargin{5};
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Daniele Nicolodi <nicolodi@science.unitn.it>
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28 fs = varargin{6};
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29 win = varargin{7};
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Daniele Nicolodi <nicolodi@science.unitn.it>
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30 order = varargin{8};
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Daniele Nicolodi <nicolodi@science.unitn.it>
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31 olap = varargin{9};
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Daniele Nicolodi <nicolodi@science.unitn.it>
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32 Lmin = varargin{10};
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33
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Daniele Nicolodi <nicolodi@science.unitn.it>
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34 twopi = 2.0*pi;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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35 nf = length(f);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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36 Sxx = zeros(nf,1);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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37 S = zeros(nf,1);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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38 ENBW = zeros(nf,1);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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39 devxx = zeros(nf,1);
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40 dev = zeros(nf,1);
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41
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Daniele Nicolodi <nicolodi@science.unitn.it>
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42 disp_each = round(nf/100)*10;
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43
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Daniele Nicolodi <nicolodi@science.unitn.it>
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44 winType = win.type;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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45 winPsll = win.psll;
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46
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Daniele Nicolodi <nicolodi@science.unitn.it>
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47 minReached = 0;
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48
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Daniele Nicolodi <nicolodi@science.unitn.it>
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49 for jj = 1:nf
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50
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51 if mod(jj, disp_each) == 0 || jj == 1 || jj == nf
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52 utils.helper.msg(msg.PROC1, 'computing frequency %04d of %d: %f Hz', jj, nf, f(jj));
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53 end
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54
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Daniele Nicolodi <nicolodi@science.unitn.it>
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55 % compute DFT exponent and window
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Daniele Nicolodi <nicolodi@science.unitn.it>
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56 l = L(jj);
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57
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Daniele Nicolodi <nicolodi@science.unitn.it>
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58 % Check if we need to update the window values
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Daniele Nicolodi <nicolodi@science.unitn.it>
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59 % - once we reach Lmin, the window values don't change.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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60 if ~minReached
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Daniele Nicolodi <nicolodi@science.unitn.it>
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61 switch lower(winType)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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62 case 'kaiser'
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63 win = specwin(winType, l, winPsll);
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64 otherwise
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65 win = specwin(winType, l);
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66 end
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67 if l == Lmin
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68 minReached = 1;
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69 end
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70 end
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71
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Daniele Nicolodi <nicolodi@science.unitn.it>
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72 p = 1i * twopi * m(jj)/l.*(0:l-1);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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73 C = win.win .* exp(p);
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74
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Daniele Nicolodi <nicolodi@science.unitn.it>
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75 % Core DFT part in C-mex file
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Daniele Nicolodi <nicolodi@science.unitn.it>
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76 [A, B,nsegs] = ltpda_dft(x, l, C, olap, order);
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77
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78 if mod(jj, disp_each) == 0 || jj == 1 || jj == nf
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79 utils.helper.msg(msg.PROC2, 'averaged %d segments', nsegs);
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80 end
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81
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Daniele Nicolodi <nicolodi@science.unitn.it>
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82 A2ns = 2.0*A;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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83 B2ns = 4.0*B/nsegs;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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84 S1 = win.ws;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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85 S12 = S1*S1;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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86 S2 = win.ws2;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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87 ENBW(jj) = fs*S2/S12;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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88 % scale asd/psd
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Daniele Nicolodi <nicolodi@science.unitn.it>
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89 Sxx(jj) = A2ns/fs/S2;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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90 S(jj) = A2ns/S12;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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91 % scale sqrt(variance)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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92 devxx(jj) = sqrt(B2ns/fs^2/S2^2);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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93 dev(jj) = sqrt(B2ns/S12^2);
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94
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95 end
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Daniele Nicolodi <nicolodi@science.unitn.it>
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96
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Daniele Nicolodi <nicolodi@science.unitn.it>
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97 varargout{1} = S;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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98 varargout{2} = Sxx;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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99 varargout{3} = dev;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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100 varargout{4} = devxx;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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101 varargout{5} = ENBW;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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102 end
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103