% 'signal_band_filter': example of pass-band filter (using the signal toolbox fct fdesign)
% frequency and bandwidth need to be modified in the function
%
% OUTPUT: 
% DataOut: Matlab structure representing the output (filtered) field
%
%INPUT:
% DataIn: Matlab structure representing the output field
%

function DataOut=signal_bandpass_filter(DataIn)
%% set GUI config
DataOut=[];
if strcmp(DataIn,'*')   
    DataOut.InputFieldType='1D';
    return
end
%%%%%%%%%%%%%%%%%%%%%%%%%
frequency=2*5/54.5;% frequency at which the signal needs to be filetered
 %d=fdesign.bandpass(0.8*frequency, 0.95*frequency, 1.05*frequency, 1.2*frequency, 60, 1, 60);
 d=fdesign.bandpass(0.7*frequency, 0.9*frequency, 1.1*frequency, 1.3*frequency, 60, 1, 60);
 Hd=design(d);% command  fvtool(Hd) to visualize the filter frequency response
 DataOut=DataIn;
 if isfield(DataIn,'U')
 DataOut.U = filter(Hd,DataIn.U);
 end
  if isfield(DataIn,'V')
 DataOut.V = filter(Hd,DataIn.V);
 end