view m-toolbox/classes/@ao/mlpsd_mex.m @ 37:a4b7ceae0403
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author |
Daniele Nicolodi <nicolodi@science.unitn.it> |
date |
Mon, 05 Dec 2011 16:20:06 +0100 (2011-12-05) |
parents |
f0afece42f48 |
children |
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% MLPSD_MEX calls the ltpda_dft.mex to compute the DFT part of the LPSD algorithm
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DESCRIPTION: MLPSD_MEX calls the ltpda_dft.mex to compute the DFT part of the
% LPSD algorithm
%
% CALL: [S,Sxx,ENBW] = mlpsd_mex(x,f,r,m,L,fs,win,order,olap)
%
% VERSION: $Id: mlpsd_mex.m,v 1.13 2011/05/22 22:22:50 mauro Exp $
%
% HISTORY: 19-05-2007 M Hewitson
% Creation
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function varargout = mlpsd_mex(varargin)
import utils.const.*
utils.helper.msg(msg.PROC1, 'using ltpda_dft.mex to compute core DFT');
% Get inputs
x = varargin{1};
f = varargin{2};
r = varargin{3};
m = varargin{4};
L = varargin{5};
fs = varargin{6};
win = varargin{7};
order = varargin{8};
olap = varargin{9};
Lmin = varargin{10};
twopi = 2.0*pi;
nf = length(f);
Sxx = zeros(nf,1);
S = zeros(nf,1);
ENBW = zeros(nf,1);
devxx = zeros(nf,1);
dev = zeros(nf,1);
disp_each = round(nf/100)*10;
winType = win.type;
winPsll = win.psll;
minReached = 0;
for jj = 1:nf
if mod(jj, disp_each) == 0 || jj == 1 || jj == nf
utils.helper.msg(msg.PROC1, 'computing frequency %04d of %d: %f Hz', jj, nf, f(jj));
end
% compute DFT exponent and window
l = L(jj);
% Check if we need to update the window values
% - once we reach Lmin, the window values don't change.
if ~minReached
switch lower(winType)
case 'kaiser'
win = specwin(winType, l, winPsll);
otherwise
win = specwin(winType, l);
end
if l == Lmin
minReached = 1;
end
end
p = 1i * twopi * m(jj)/l.*(0:l-1);
C = win.win .* exp(p);
% Core DFT part in C-mex file
[A, B,nsegs] = ltpda_dft(x, l, C, olap, order);
if mod(jj, disp_each) == 0 || jj == 1 || jj == nf
utils.helper.msg(msg.PROC2, 'averaged %d segments', nsegs);
end
A2ns = 2.0*A;
B2ns = 4.0*B/nsegs;
S1 = win.ws;
S12 = S1*S1;
S2 = win.ws2;
ENBW(jj) = fs*S2/S12;
% scale asd/psd
Sxx(jj) = A2ns/fs/S2;
S(jj) = A2ns/S12;
% scale sqrt(variance)
devxx(jj) = sqrt(B2ns/fs^2/S2^2);
dev(jj) = sqrt(B2ns/S12^2);
end
varargout{1} = S;
varargout{2} = Sxx;
varargout{3} = dev;
varargout{4} = devxx;
varargout{5} = ENBW;
end