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comparison m-toolbox/classes/@ao/mlpsd_mex.m @ 0:f0afece42f48

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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-1:000000000000 0:f0afece42f48
1 % MLPSD_MEX calls the ltpda_dft.mex to compute the DFT part of the LPSD algorithm
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 %
4 % DESCRIPTION: MLPSD_MEX calls the ltpda_dft.mex to compute the DFT part of the
5 % LPSD algorithm
6 %
7 % CALL: [S,Sxx,ENBW] = mlpsd_mex(x,f,r,m,L,fs,win,order,olap)
8 %
9 % VERSION: $Id: mlpsd_mex.m,v 1.13 2011/05/22 22:22:50 mauro Exp $
10 %
11 % HISTORY: 19-05-2007 M Hewitson
12 % Creation
13 %
14 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
15
16 function varargout = mlpsd_mex(varargin)
17
18 import utils.const.*
19
20 utils.helper.msg(msg.PROC1, 'using ltpda_dft.mex to compute core DFT');
21
22 % Get inputs
23 x = varargin{1};
24 f = varargin{2};
25 r = varargin{3};
26 m = varargin{4};
27 L = varargin{5};
28 fs = varargin{6};
29 win = varargin{7};
30 order = varargin{8};
31 olap = varargin{9};
32 Lmin = varargin{10};
33
34 twopi = 2.0*pi;
35 nf = length(f);
36 Sxx = zeros(nf,1);
37 S = zeros(nf,1);
38 ENBW = zeros(nf,1);
39 devxx = zeros(nf,1);
40 dev = zeros(nf,1);
41
42 disp_each = round(nf/100)*10;
43
44 winType = win.type;
45 winPsll = win.psll;
46
47 minReached = 0;
48
49 for jj = 1:nf
50
51 if mod(jj, disp_each) == 0 || jj == 1 || jj == nf
52 utils.helper.msg(msg.PROC1, 'computing frequency %04d of %d: %f Hz', jj, nf, f(jj));
53 end
54
55 % compute DFT exponent and window
56 l = L(jj);
57
58 % Check if we need to update the window values
59 % - once we reach Lmin, the window values don't change.
60 if ~minReached
61 switch lower(winType)
62 case 'kaiser'
63 win = specwin(winType, l, winPsll);
64 otherwise
65 win = specwin(winType, l);
66 end
67 if l == Lmin
68 minReached = 1;
69 end
70 end
71
72 p = 1i * twopi * m(jj)/l.*(0:l-1);
73 C = win.win .* exp(p);
74
75 % Core DFT part in C-mex file
76 [A, B,nsegs] = ltpda_dft(x, l, C, olap, order);
77
78 if mod(jj, disp_each) == 0 || jj == 1 || jj == nf
79 utils.helper.msg(msg.PROC2, 'averaged %d segments', nsegs);
80 end
81
82 A2ns = 2.0*A;
83 B2ns = 4.0*B/nsegs;
84 S1 = win.ws;
85 S12 = S1*S1;
86 S2 = win.ws2;
87 ENBW(jj) = fs*S2/S12;
88 % scale asd/psd
89 Sxx(jj) = A2ns/fs/S2;
90 S(jj) = A2ns/S12;
91 % scale sqrt(variance)
92 devxx(jj) = sqrt(B2ns/fs^2/S2^2);
93 dev(jj) = sqrt(B2ns/S12^2);
94
95 end
96
97 varargout{1} = S;
98 varargout{2} = Sxx;
99 varargout{3} = dev;
100 varargout{4} = devxx;
101 varargout{5} = ENBW;
102 end
103