tfrview.m

自己写的一个计算时频分布的程序,可知指定Cohen类分布类型WVD

function tfrview(tfr,sig,t,method,param,p1,p2,p3,p4,p5);
%TFRVIEW Visualization of time-frequency representations.
%        TFRVIEW(TFR,SIG,T,METHOD,PARAM,P1,P2,P3,P4,P5) 
%        allows to visualize a time-frequency representation.
%        TFRVIEW is called through TFRQVIEW from any TFR* function.
%
%        TFR    : time-frequency representation.
%        SIG    : signal in the time-domain.  
%        T      : time instants.
%        METHOD : chosen representation (name of the corresponding M-file)
%        PARAM  : visualization parameter vector :
%         PARAM  = [DISPLAY LINLOG THRESHOLD LEVNUMB NF2 LAYOUT FS ISGRID] where
%         DISPLAY=1..5 for contour, imagesc, pcolor, surf or mesh
%         LINLOG =0/1 for linearly/logarithmically spaced levels
%                  
%         THRESHOLD  is the visualization threshold, in % 
%         LEVELNUMB  is the number of levels used with contour
%         NF2        is the number of frequency bins displayed
%         LAYOUT determines the layout of the figure : TFR alone (1),  
%                TFR and SIG (2), TFR and spectrum (3), TFR and SIG and 
%                spectrum (4), add 4 if you want a colorbar
%         FS     is the sampling frequency (may be set to 1.0)
%         ISGRID depends on the grids' presence : 
%                isgrid=isgridsig+2*isgridspec+4*isgridtfr
%                where isgridsig=1 if a grid is present on the signal
%                and =0 if not, and so on
%        P1..P5: parameters of the representation. Run the file 
%                TFRPARAM(METHOD) to know the meaning of P1..P5.  		 
%
%	TFRVIEW is called through TFRQVIEW by any file TFR*.
%
%			Use TFRQVIEW preferably.
%			------------------------
%
%	See also TFRQVIEW, TFRPARAM.

%	F. Auger, July 1994, July 1995 - 
%	O. Lemoine, October-November 1995, May-June 1996. 
%       F. Auger, May 1998.
%	Copyright (c) CNRS - France 1996. 
%
%	------------------- CONFIDENTIAL PROGRAM -------------------- 
%	This program can not be used without the authorization of its
%	author(s). For any comment or bug report, please send e-mail to 
%	[e-mail] 

comp=computer; % so as to know the running computer
MatlabVersion=version; MatlabVersion=str2num(MatlabVersion(1));
% I hope that future Matlab versions will be more compatible
if (MatlabVersion==4),
 TickLabelStr='TickLabels';
elseif (MatlabVersion==5 || MatlabVersion == 6),
 TickLabelStr='Ticklabel';
else
 error('unsupported matlab version. please send an email.'); 
end;
 
if ( nargin < 5 ),
 error ('at least 5 parameters are required');
end;

[tfrrow,tfrcol] = size(tfr); % the size of tfr
[trow,tcol]     = size(t);   % the size of t
[Nsig,Ncol]     = size(sig); % the size of sig
maxi=max(max(tfr)); 

% Extraction of the elements of param
display   = param(1);        % contour, imagesc, pcolor, surf, or mesh
linlog    = param(2);        % linear or logarithmic scale
threshold = param(3);        % visualization threshold
levelnumb = param(4);        % number of levels
Nf2       = param(5);        % number of frequency points
layout    = param(6);        % figure layout
fs        = param(7);        % sampling frequency
isgrid    = param(8);        % grid(s)

if fs<1000, unitHz=1;                            % display in  s and  Hz
elseif (fs>=1e3 & fs<1e6), fs=fs/1e3; unitHz=2;  % display in ms and kHz
elseif (fs>=1e6), fs=fs/1e6; unitHz=3;           % display in us and MHz
end

linlogtfr=rem(linlog,2);
linlogspec=rem(linlog-linlogtfr,4)/2;
sigenveloppe=rem(linlog-linlogtfr-linlogspec*2,8)/4;

issig=rem(layout-1,2);
isspec=rem(layout-1-issig,4)/2;
iscolorbar=rem(layout-1-issig-isspec*2,8)/4;
if isempty(sig),                        % I can't make miracles
 issig=0; isspec=0; layout=issig+isspec*2+1;
else  
 layout=layout-4*iscolorbar;
end;

isgridsig =rem(isgrid,2);
isgridspec=rem(isgrid-isgridsig,4)/2;
isgridtfr =rem(isgrid-isgridsig-isgridspec*2,8)/4;

% Computation of isaffine and freq (vector of frequency samples) 
if istfraff(method),
 freq=eval(['p',num2str(nargin-5)]);   	% last input argument is freqs.
 isaffine=1;
 if display==2,	                        % imagesc not allowed
  display=3;                            % non linear scales for the axes.
  disp('Imagesc does not support non-linear scales for axes. We use pcolor instead');
 end
else
 isaffine=0;                            % weyl-heisenberg group of distributions
 freq=(0.5*(0:Nf2-1)/Nf2);              % dispaly only the positive frequencies
end
freqr=freq*fs; ts=t/fs;                 % real time and frequency


% Update variables mini, levels, LinLogStr according to linlog 
if ~linlogtfr,
 if (display==4)|(display==5),          % surf or mesh
  mini=min(min(tfr));
 else
  mini=max(min(min(tfr)),maxi*threshold/100.0);
 end
 levels=linspace(mini,maxi,levelnumb+1); 
 LinLogStr=', lin. scale';
else
 mini=max(min(min(tfr)),maxi*threshold/100.0);
 levels=logspace(log10(mini),log10(maxi),levelnumb+1);
 LinLogStr=', log. scale';
end;

% Initialization of the current figure
zoom off; clf; 
set(gcf,'Resize','On','NextPlot','Add');

% Initialization of the axes
if iscolorbar,
 axcb   = axes('Units','normal','Visible','off','Box','On');
 set(gcf,'UserData',[get(gcf,'UserData') axcb]);
end;

if issig,
 axsig  = axes('Units','normal','Visible','off','Box','On');
 if comp(1:2)=='PC', set(axsig ,'fontsize',10); end
 set(gcf,'UserData',[get(gcf,'UserData') axsig]);
end;

if isspec,
 axspec = axes('Units','normal','Visible','off','Box','On');
 if comp(1:2)=='PC', set(axspec,'fontsize',10); end;
 set(gcf,'UserData',[get(gcf,'UserData') axspec]);
end;

axtfr  = axes('Units','normal','Visible','off','Box','On');
if comp(1:2)=='PC', set(axtfr ,'fontsize',10); end
set(gcf,'UserData',[get(gcf,'UserData') axtfr]);

 % Test of analycity and computation of spec
 if ~isempty(sig),
  for k=1:Ncol,
   isana=1; alpha=2; Lt=max(t)-min(t)+1;   	
   if 2*Nf2>=Lt,
    spec(:,k)=abs(fft(sig(min(t):max(t),k),2*Nf2)).^2; 
   else
    % modifications :  F. Auger (fog), 30/11/97
    Nb_tranches_fog = floor(Lt/(2*Nf2));
    % fprintf('%f \n',Nb_tranches_fog);
    spec(:,k)=zeros(2*Nf2,1);
    for Num_tranche_fog=0:Nb_tranches_fog-1,
     % fprintf('%f \n',Num_tranche_fog);
     spec(:,k)=spec(:,k)+abs(fft(sig(min(t)+2*Nf2*Num_tranche_fog+(0:2*Nf2-1),k))).^2;
    end;

    if (Lt>Nb_tranches_fog*2*Nf2),
     spectre_fog=fft(sig(min(t)+tfrrow*Nb_tranches_fog:max(t),k),2*Nf2);
     spectre_fog=spectre_fog(:);
     spec(:,k)=spec(:,k)+abs(spectre_fog).^2;
    end;    
    % sp=abs(fft(sig(min(t):max(t),k))).^2; 
    % fr1=(0.5*(0:Lt-1)/Lt)*fs;
    % fr2=(0.5*(0:2*Nf2-1)/2/Nf2)*fs;
    % spec(:,k)=interp1(fr1,sp,fr2);
   end
   spec1=sum(spec(1:Nf2,k));
   spec2=sum(spec(Nf2+1:2*Nf2,k));
   if spec2>spec1/10,
    isana=0;
    if ~isreal(sig(min(t):max(t),k)),
     alpha=1;
    end
   end
  end
 end

 if layout==1,                          % Time-Frequency Representation only
  set(axtfr,'Position',[0.10 0.10 0.80 0.80]);

 elseif layout==2,			% TFR + Signal
  set(axtfr,'Position',[0.10 0.10 0.80 0.55]);
  set(axsig,'Position',[0.10 0.73 0.80 0.20]); 
  axes(axsig);  
  if sigenveloppe,
   plot((min(t):max(t))/fs,real(sig(min(t):max(t),:)),...
        (min(t):max(t))/fs, abs(sig(min(t):max(t),:)));
  else
   plot((min(t):max(t))/fs,real(sig(min(t):max(t),:)));
  end;
  set(gca,['X' TickLabelStr],[]);
  ylabel('Real part');
  title('Signal in time');
  Min=min(min(real(sig))); Max=max(max(real(sig)));
  axis([min(ts) max(ts) Min Max]);

 elseif layout==3,			% TFR + spectrum
  set(axspec,'Position',[0.10 0.10 0.15 0.80]);
  set(axtfr ,'Position',[0.35 0.10 0.55 0.80]);

  axes(axspec); 
  if isaffine, 
   f1=freqr(1); f2=freqr(Nf2); df=f2-f1; 
   Nf4=round((Nf2-1)*fs/(2*df))+1;
   for k=1:Ncol,
    spec(1:alpha*Nf4,k)=abs(fft(sig(min(t):max(t),k),alpha*Nf4)).^2; 
   end
   spec=spec((round(f1*2*(Nf4-1)/fs)+1):(round(f1*2*(Nf4-1)/fs)+Nf2),:);
   freqs=linspace(f1,f2,Nf2);
  else
   freqs=freqr;
   spec=spec(1:Nf2,:);
  end
  Maxsp=max(max(spec));
  if linlogspec==0,
   plot(freqs,spec);
   title('Linear scale'); 
   set(gca,'ytick',[0 round(Maxsp/2) round(Maxsp)]);
   set(gca,'Ylim',[0 Maxsp*1.2]);
  else
   plot(freqs,10*log10(spec/Maxsp)); 
   title('Log. scale [dB]');
   set(gca,'ytick',[fix(10^(log10(Maxsp)/2));fix(Maxsp)]);
   str1=['   ']; str2=['   '];
   st1=num2str(fix(10*log10(Maxsp)/2)); str1(1:length(st1))=st1;
   st2=num2str(fix(10*log10(Maxsp)));   str2(1:length(st2))=st2; 
   set(axspec,['Y' TickLabelStr],[str1;str2]);
   set(gca,'Ylim',[10*log10(min(min(spec))/Maxsp) 0]);
  end
  xlabel('Energy spectral density');
  Nsp=length(spec); 
  set(gca,'Xlim',[freqs(1) freqs(Nsp)],...
          ['X' TickLabelStr],[],'view',[-90 90]);

 elseif layout==4,			% TFR + signal + spectrum

  set(axspec,'Position',[0.10 0.10 0.15 0.55]);
  set(axsig ,'Position',[0.35 0.73 0.55 0.20]);
  set(axtfr ,'Position',[0.35 0.10 0.55 0.55]);

  axes(axsig); 
  if sigenveloppe,
   plot((min(t):max(t))/fs,real(sig(min(t):max(t),:)),...
        (min(t):max(t))/fs, abs(sig(min(t):max(t),:)));
  else
   plot((min(t):max(t))/fs,real(sig(min(t):max(t),:)));
  end;
  ylabel('Real part');
  title('Signal in time');
  set(gca,['X' TickLabelStr],[]);

  Min=min(min(real(sig))); Max=max(max(real(sig)));
  axis([min(ts) max(ts) Min Max]);

  axes(axspec); 
  if isaffine, 
% IF YOU UNDERSTAND SOMETHING TO THAT, PLEASE EXPLAIN ME (f. auger)
%   f1=freqr(1); f2=freqr(Nf2); df=f2-f1; 
%   Nf4=round((Nf2-1)*fs/(2*df))+1;
%   for k=1:Ncol,
%    spec(1:alpha*Nf4,k)=abs(fft(sig(min(t):max(t),k),alpha*Nf4)).^2; 
%   end
%   spec=spec((round(f1*2*(Nf4-1)/fs)+1):(round(f1*2*(Nf4-1)/fs)+Nf2),:);
%   freqs=linspace(f1,f2,Nf2);
   for k=1:Ncol,
    freqs=linspace(freqr(1),freqr(Nf2),Nf2); 
    spec=interp1(0.5*fs*(0:Nf2-1)/Nf2,spec(1:Nf2,k),freqs);
   end;
  else
   freqs=freqr;