Mercurial > hg > ltpda
view m-toolbox/classes/@ao/ltf_plan.m @ 39:11e3ed9d2115 database-connection-manager
Implement databases listing in database connection dialog
author | Daniele Nicolodi <nicolodi@science.unitn.it> |
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date | Mon, 05 Dec 2011 16:20:06 +0100 |
parents | f0afece42f48 |
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% LTF_PLAN computes all input values needed for the LPSD and LTFE algorithms. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % DESCRIPTION: LTF_PLAN computes all input values needed for the LPSD and LTFE % algorithms. % % CALL: [f, r, b, L, K] = ltf_plan(Ndata, fs, olap, bmin, Lmin, Jdes, Kdes) % % INPUTS: Ndata - the length of the time-series to be processed % fs - the sample rate of the time-series to be processed % olap - overlap percentage, usually taken from the window function % bmin - the minimum bin number to be used. This is usually taken % from the window function. % Lmin - The minimum segment length. % Jdes - the desired number of frequencies. % Kdes - The desired number of averages. % % OUTPUTS: Each output is a vector, one value per frequency: % f - the frequency % r - frequency resolution (Hz) % b - bin number % L - segment lengths % K - number of averages % % PARAMETER LIST: % % VERSION: $Id: ltf_plan.m,v 1.6 2009/08/31 17:09:43 ingo Exp $ % % HISTORY: 19-02-2008 M Hewitson % Creation % % REFERENCE: "lpsd revisited: ltf" / S2-AEI-TN-3052 % 2008/02/07 V1.1 % G Heinzel % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % q - a vector of start indices for the segments function varargout = ltf_plan(varargin) %% ------ Check inputs ------------------------------------------------ if nargin ~= 7 || nargout ~= 5 help(mfilename) error('### Incorrect usage'); end Ndata = varargin{1}; fs = varargin{2}; olap = varargin{3}; bmin = varargin{4}; Lmin = varargin{5}; Jdes = varargin{6}; Kdes = varargin{7}; %% ------ Set up some variables ------------------------------------------- xov = (1 - olap/100); fmin = fs / Ndata * bmin; fmax = fs/2; fresmin = fs / Ndata; freslim = fresmin * (1+xov*(Kdes-1)); logfact = (Ndata/2)^(1/Jdes) - 1; %% ------ Prepare outputs ------------------------------------------- f = []; r = []; b = []; L = []; K = []; % q = []; %% ------ Loop over frequency ------------------------------------------- fi = fmin; while fi < fmax fres = fi * logfact; if fres <= freslim fres = sqrt(fres*freslim); end if fres < fresmin fres = fresmin; end bin = fi/fres; if bin < bmin bin = bmin; fres = fi/bin; end dftlen = round(fs / fres); if dftlen > Ndata dftlen = Ndata; end if dftlen < Lmin dftlen = Lmin; end nseg = round((Ndata - dftlen) / (xov*dftlen) + 1); if nseg == 1 dftlen = Ndata; end fres = fs / dftlen; bin = fi / fres; % Store outputs f = [f fi]; r = [r fres]; b = [b bin]; L = [L dftlen]; K = [K nseg]; fi = fi + fres; end %% ------ Set outputs ------------------------------------------- varargout{1} = f.'; varargout{2} = r.'; varargout{3} = b.'; varargout{4} = L.'; varargout{5} = K.'; end