西南交通大学研究生一年级现代信号处理作业

function tfrqview(tfr,sig,t,method,p1,p2,p3,p4,p5); %TFRQVIEW Quick visualization of time-frequency representations. % TFRQVIEW(TFR,SIG,T,METHOD,P1,P2,P3,P4,P5) allows a quick % visualization of a time-frequency representation. % % TFR : time-frequency representation (MxN). % SIG : signal in time. If unavailable, put sig=[] as input % parameter. (default : []). % T : time instants (default : 1:N). % METHOD : name of chosen representation (default : 'TYPE1'). % See the TFR* files for authorized names. % TYPE1 : the representation TFR goes in normalized % frequency from -0.5 to 0.5 ; % TYPE2 : the representation TFR goes in normalized % frequency from 0 to 0.5. % P1...P5 : optional parameters of the representation : run the % file TFRPARAM(METHOD) to know the meaning of P1..P5 % for your method. % % When you use the 'save' option in the main menu, you save all your % variables as well as two strings, TfrQView and TfrView, in a mat % file. If you load this file and do eval(TfrQView), you will restart % the display session under tfrqview ; if you do eval(TfrView), you % will obtain the exact layout of the screen you had when clicking on % the 'save' button. % % Example : % sig=fmsin(128); tfr=tfrwv(sig); % tfrqview(tfr,sig,1:128,'tfrwv'); % % See also TFRVIEW, TFRSAVE, TFRPARAM. % F. Auger, September 1994, July 1995 % O. Lemoine, Oct 1995, May-July 1996. % F. Auger, May 1998. % Copyright (c) 1996 by CNRS (France). % % This program is free software; you can redistribute it and/or modify % it under the terms of the GNU General Public License as published by % the Free Software Foundation; either version 2 of the License, or % (at your option) any later version. % % This program is distributed in the hope that it will be useful, % but WITHOUT ANY WARRANTY; without even the implied warranty of % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the % GNU General Public License for more details. % % You should have received a copy of the GNU General Public License % along with this program; if not, write to the Free Software % Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA comp=computer; % so as to know the running computer MatlabVersion=version; MatlabVersion=str2num(MatlabVersion(1)); % Tests on the input arguments if nargin<1, error('At least one parameter required'); % at least the tfr end [tfrrow,tfrcol]=size(tfr); if nargin==1, sig=[]; t=1:tfrcol; method='type1'; % empty signal elseif nargin==2, t=1:tfrcol; method='type1'; elseif nargin==3, method='type1'; end [trow,tcol] = size(t); if (trow~=1), error('T must only have one row'); % t must be a row vector end; if (tfrcol~=tcol), error('T must have as much elements as tfr has columns'); end; [Nsig,Ncol]=size(sig); if Ncol>2, error('SIG must have one or two columns'); end % Computation of Nf2, the number of interresting points in frequency method=upper(method); if istfr2(method), Nf2=tfrrow; elseif istfr1(method), Nf2=tfrrow/2; else error('Unknown representation. Use type1 or type2'); end; % Computation of freq (vector of frequency samples) if istfraff(method), freq=eval(['p',num2str(nargin-4)]); % last input argument is freqs. else freq=(0.5*(0:Nf2-1)/Nf2); end % Initialization of the variables if exist('options.mat'), load options colormap(SavedColorMap); else threshold=5.0; % visualization threshold linlogtfr=0; % tfr visualization scale : 0 for linear 1 for logarithmic linlogspec=1; % spectrum visualization scale sigenveloppe=0; % signal enveloppe visualization levelnumb=64; % number of levels in the contour plot colmap=1; % colormap index display=2; % display index isgridsig=0; % grid on signal isgridspec=0; % grid on spectrum isgridtfr=0; % grid on tfr issig=0; % display signal isspec=0; % display spectrum iscolorbar=0; % display colorbar fs=1.0; % sampling frequency (Hz) fmin=0.0; % smallest displayed frequency fmax=0.5*fs; % highest displayed frequency end; % Test of analycity if ~isempty(sig), for k=1:Ncol, % spec(:,k)=abs(fft(sig(min(t):max(t),k))).^2; Nsp=length(spec); % modifications : F. Auger (fog), 30/11/97 Lt_fog=max(t)-min(t)+1; Nb_tranches_fog = floor(Lt_fog/tfrrow); % fprintf('%f \n',Nb_tranches_fog); spec(:,k)=zeros(tfrrow,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)+tfrrow*Num_tranche_fog+(0:tfrrow-1),k))).^2; end; if (Lt_fog>Nb_tranches_fog*tfrrow), spectre_fog=fft(sig(min(t)+tfrrow*Nb_tranches_fog:max(t),k),tfrrow); spectre_fog=spectre_fog(:); spec(:,k)=spec(:,k)+abs(spectre_fog).^2; end; % spec1=sum(spec(1:tfrrow/2,k)); % spec2=sum(spec(tfrrow/2+1:Nsp,k)); spec1=sum(spec(1:tfrrow/2,k)); spec2=sum(spec(tfrrow/2+1:tfrrow,k)); if spec2>spec1/10, disp('Be careful : the signal is not analytic!'); end end end % Test of reality if (Ncol==2 & ~isreal(tfr)), disp('Cross distribution. As the result is complex, we display the real part.'); tfr=real(tfr); end ChoiceDisplay = 1; % All the possible values of the choice variable ChoiceLayout = 2; ChoiceSampling = 3; ChoiceFreqBounds = 4; ChoiceThreshold = 5; ChoiceLinlog = 6; ChoiceRedraw = 7; ChoiceNewFigure = 8; ChoiceSaveResults = 9; ChoiceSaveOptions = 10; ChoicePrint = 11; ChoiceClose = 12; CallTfrView = 1; % 1 to call tfrview, 0 not to do it RefreshFigure=1; % 1 to refresh figure every time, 0 to freeze choice=ChoiceSampling; while choice~=ChoiceClose, % while not close if RefreshFigure & CallTfrView, % Call to tfrview linlog=linlogtfr+2*linlogspec+4*sigenveloppe; isgrid=isgridsig+2*isgridspec+4*isgridtfr; layout=issig+isspec*2+iscolorbar*4+1; param = [display, linlog, threshold, levelnumb, Nf2, layout,... fs, isgrid, fmin, fmax]; if (nargin<=4), tfrview(tfr,sig,t,method,param); elseif (nargin==5), tfrview(tfr,sig,t,method,param,p1); elseif (nargin==6), tfrview(tfr,sig,t,method,param,p1,p2); elseif (nargin==7), tfrview(tfr,sig,t,method,param,p1,p2,p3); elseif (nargin==8), tfrview(tfr,sig,t,method,param,p1,p2,p3,p4); elseif (nargin==9), tfrview(tfr,sig,t,method,param,p1,p2,p3,p4,p5); end; end; if (linlogtfr==0), % Lin/log scale of the tfr linlogstr='Change to a logarithmic scale'; else linlogstr='Change to a linear scale'; end; if (RefreshFigure==1), redrawstr='Don''t redraw yet'; else redrawstr='Redraw now'; end; % Main menu choice=menu ('TFRQVIEW MENU :',... 'Change the display mode',... % ChoiceDisplay 'Change the display layout',... % ChoiceLayout 'Change the sampling frequency',... % ChoiceSampling 'Change the frequency bounds',... % ChoiceFreqBounds 'Change the threshold',... % ChoiceThreshold linlogstr,... % ChoiceLinlog redrawstr,... % ChoiceRedraw 'New figure',... % ChoiceNewFigure 'Save results',... % ChoiceSaveResults 'Save options',... % ChoiceSaveOptions 'Print',... % ChoicePrint 'Close'); % ChoiceClose if (choice==ChoiceDisplay), % Change the display mode OldDisplay=display; display=menu('DISPLAY MODE :',... 'contour',... % 1 'imagesc',...