source: trunk/src/transform_field/signal_bandpass_filter.m @ 924

Last change on this file since 924 was 924, checked in by g7moreau, 5 years ago
  • Update Copyright Copyright 2008-2016, LEGI UMR 5519 / CNRS UGA G-INP, Grenoble, France
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1% 'signal_band_filter': example of pass-band filter (using the signal toolbox fct fdesign)
2% frequency and bandwidth need to be modified in the function
3%
4% OUTPUT:
5% DataOut: Matlab structure representing the output (filtered) field
6%
7%INPUT:
8% DataIn: Matlab structure representing the output field
9
10%=======================================================================
11% Copyright 2008-2016, LEGI UMR 5519 / CNRS UGA G-INP, Grenoble, France
12%   http://www.legi.grenoble-inp.fr
13%   Joel.Sommeria - Joel.Sommeria (A) legi.cnrs.fr
14%
15%     This file is part of the toolbox UVMAT.
16%
17%     UVMAT is free software; you can redistribute it and/or modify
18%     it under the terms of the GNU General Public License as published
19%     by the Free Software Foundation; either version 2 of the license,
20%     or (at your option) any later version.
21%
22%     UVMAT is distributed in the hope that it will be useful,
23%     but WITHOUT ANY WARRANTY; without even the implied warranty of
24%     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25%     GNU General Public License (see LICENSE.txt) for more details.
26%=======================================================================
27
28function DataOut=signal_bandpass_filter(DataIn,Param)
29
30%% request input parameters
31if isfield(DataIn,'Action') && isfield(DataIn.Action,'RUN') && isequal(DataIn.Action.RUN,0)
32    VarNbDim=cellfun('length',DataIn.VarDimName);
33    [tild,rank]=sort(VarNbDim,2,'descend');% sort the list of input variables, putting the ones with higher dimensionality first
34    ListVarName=DataIn.ListVarName(rank);
35    VarDimName=DataIn.VarDimName(rank);
36    InitialValue=1;%default choice
37    if isfield(Param,'TransformInput') && isfield(Param.TransformInput,'VariableName')
38        val=find(strcmp(Param.TransformInput.VariableName,ListVarName));
39        if ~isempty(val);
40            InitialValue=val;
41        end
42    end
43    [s,OK] = listdlg('PromptString','Select the variable to process:',...
44        'SelectionMode','single','InitialValue',InitialValue,...
45        'ListString',ListVarName);
46    if OK==1
47        VarName=ListVarName{s};
48        DataOut.TransformInput.VariableName=VarName;
49        dlg_title = [mfilename ' filter signal along first dim ' VarDimName{s}{1}];% title of the input dialog fig
50        prompt = {'central filtering frequency';'bandwith (relative to the central frequency) '};% titles of the edit boxes
51        %default input:
52        def={'';'0.1'};% filtering frequency and relative bandwidth
53
54        if isfield(Param,'TransformInput')% if parameters have been memorised
55            if isfield(Param.TransformInput,'CentralFrequency')
56                def{1}=num2str(Param.TransformInput.CentralFrequency);
57            end
58            if isfield(Param.TransformInput,'BandWidth')
59                 def{2}=num2str(Param.TransformInput.BandWidth);
60            end
61        end
62        num_lines= 1;%numel(prompt);
63        % open the dialog fig
64        answer = inputdlg(prompt,dlg_title,num_lines,def);
65        DataOut.TransformInput.CentralFrequency=str2num(answer{1});
66        DataOut.TransformInput.BandWidth=str2num(answer{2});
67    end
68    return
69end
70
71
72
73%% set GUI config
74DataOut=[];
75if strcmp(DataIn,'*')   
76    DataOut.InputFieldType='1D';
77    return
78end
79%%%%%%%%%%%%%%%%%%%%%%%%%
80frequency=Param.TransformInput.CentralFrequency;% frequency at which the signal needs to be filetered
81Bw=Param.TransformInput.BandWidth;
82 DataOut=DataIn;
83 %d=fdesign.bandpass(0.8*frequency, 0.95*frequency, 1.05*frequency, 1.2*frequency, 60, 1, 60);
84 d=fdesign.bandpass((1-2*Bw)*frequency, (1-Bw)*frequency, (1+Bw)*frequency, (1+2*Bw)*frequency, 60, 1, 60);
85 Hd=design(d);% command  fvtool(Hd) to visualize the filter frequency response
86
87 if isfield(DataIn,'U')
88 DataOut.U = filter(Hd,DataIn.U);
89 end
90  if isfield(DataIn,'V')
91 DataOut.V = filter(Hd,DataIn.V);
92 end
93
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