ivan@78: function [x,N] = makesig(SigName,N)
ivan@78: % [x,N] = makesig(SigName,N) Creates artificial test signal identical to the
ivan@78: %     standard test signals proposed and used by D. Donoho and I. Johnstone
ivan@78: %     in WaveLab (- a matlab toolbox developed by Donoho et al. the statistics
ivan@78: %     department at Stanford University).
ivan@78: %
ivan@78: %    Input:  SigName - Name of the desired signal (Default 'all')
ivan@78: %                        'AllSig' (Returns a matrix with all the signals)
ivan@78: %                        'HeaviSine'
ivan@78: %                        'Bumps'
ivan@78: %                        'Blocks'
ivan@78: %                        'Doppler'
ivan@78: %                        'Ramp'
ivan@78: %                        'Cusp'
ivan@78: %                        'Sing'
ivan@78: %                        'HiSine'
ivan@78: %                        'LoSine'
ivan@78: %                        'LinChirp'
ivan@78: %                        'TwoChirp'
ivan@78: %                        'QuadChirp'
ivan@78: %                        'MishMash'
ivan@78: %                        'Werner Sorrows' (Heisenberg)
ivan@78: %                        'Leopold' (Kronecker)
ivan@78: %            N       - Length in samples of the desired signal (Default 512)
ivan@78: %
ivan@78: %    Output: x   - vector/matrix of test signals
ivan@78: %            N   - length of signal returned
ivan@78: %
ivan@78: %    See also: 
ivan@78: %
ivan@78: %    References:
ivan@78: %            WaveLab can be accessed at
ivan@78: %            www_url: http://playfair.stanford.edu/~wavelab/
ivan@78: %            Also see various articles by D.L. Donoho et al. at
ivan@78: %            web_url: http://playfair.stanford.edu/
ivan@78: 
ivan@78: %File Name: makesig.m
ivan@78: %Last Modification Date: 08/30/95	15:52:03
ivan@78: %Current Version: makesig.m	2.4
ivan@78: %File Creation Date: Thu Jun  8 10:31:11 1995
ivan@78: %Author: Jan Erik Odegard  <odegard@ece.rice.edu>
ivan@78: %
ivan@78: %Copyright (c) 2000 RICE UNIVERSITY. All rights reserved.
ivan@78: %Created by Jan Erik Odegard, Department of ECE, Rice University. 
ivan@78: %
ivan@78: %This software is distributed and licensed to you on a non-exclusive 
ivan@78: %basis, free-of-charge. Redistribution and use in source and binary forms, 
ivan@78: %with or without modification, are permitted provided that the following 
ivan@78: %conditions are met:
ivan@78: %
ivan@78: %1. Redistribution of source code must retain the above copyright notice, 
ivan@78: %   this list of conditions and the following disclaimer.
ivan@78: %2. Redistribution in binary form must reproduce the above copyright notice, 
ivan@78: %   this list of conditions and the following disclaimer in the 
ivan@78: %   documentation and/or other materials provided with the distribution.
ivan@78: %3. All advertising materials mentioning features or use of this software 
ivan@78: %   must display the following acknowledgment: This product includes 
ivan@78: %   software developed by Rice University, Houston, Texas and its contributors.
ivan@78: %4. Neither the name of the University nor the names of its contributors 
ivan@78: %   may be used to endorse or promote products derived from this software 
ivan@78: %   without specific prior written permission.
ivan@78: %
ivan@78: %THIS SOFTWARE IS PROVIDED BY WILLIAM MARSH RICE UNIVERSITY, HOUSTON, TEXAS, 
ivan@78: %AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, 
ivan@78: %BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
ivan@78: %FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RICE UNIVERSITY 
ivan@78: %OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
ivan@78: %EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
ivan@78: %PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
ivan@78: %OR BUSINESS INTERRUPTIONS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
ivan@78: %WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
ivan@78: %OTHERWISE), PRODUCT LIABILITY, OR OTHERWISE ARISING IN ANY WAY OUT OF THE 
ivan@78: %USE OF THIS SOFTWARE,  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
ivan@78: %
ivan@78: %For information on commercial licenses, contact Rice University's Office of 
ivan@78: %Technology Transfer at techtran@rice.edu or (713) 348-6173
ivan@78: %
ivan@78: %Change History: This m-file is a copy of the  code provided with WaveLab
ivan@78: %                customized to be consistent with RWT.
ivan@78: %                Jan Erik Odegard <odegard@ece.rice.edu> Thu Jun  8 1995
ivan@78: %
ivan@78: 
ivan@78: if(nargin < 1)
ivan@78:   SigName = 'AllSig';
ivan@78:   N = 512;
ivan@78: elseif(nargin == 1)
ivan@78:   N = 512;
ivan@78: end;
ivan@78: t = (1:N) ./N;
ivan@78: x = [];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'HeaviSine') | strcmp(SigName,'AllSig')),
ivan@78:   y = 4.*sin(4*pi.*t);
ivan@78:   y = y - sign(t - .3) - sign(.72 - t);
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'Bumps') | strcmp(SigName,'AllSig')),
ivan@78:   pos = [ .1 .13 .15 .23 .25 .40 .44 .65  .76 .78 .81];
ivan@78:   hgt = [ 4  5   3   4  5  4.2 2.1 4.3  3.1 5.1 4.2];
ivan@78:   wth = [.005 .005 .006 .01 .01 .03 .01 .01  .005 .008 .005];
ivan@78:   y = zeros(size(t));
ivan@78:   for j =1:length(pos)
ivan@78:     y = y + hgt(j)./( 1 + abs((t - pos(j))./wth(j))).^4;
ivan@78:   end 
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'Blocks') | strcmp(SigName,'AllSig')),
ivan@78:   pos = [ .1 .13 .15 .23 .25 .40 .44 .65  .76 .78 .81];
ivan@78:   hgt = [4 (-5) 3 (-4) 5 (-4.2) 2.1 4.3  (-3.1) 2.1 (-4.2)];
ivan@78:   y = zeros(size(t));
ivan@78:   for j=1:length(pos)
ivan@78:     y = y + (1 + sign(t-pos(j))).*(hgt(j)/2) ;
ivan@78:   end
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'Doppler') | strcmp(SigName,'AllSig')),
ivan@78:   y = sqrt(t.*(1-t)).*sin((2*pi*1.05) ./(t+.05));
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'Ramp') | strcmp(SigName,'AllSig')),
ivan@78:   y = t - (t >= .37);
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'Cusp') | strcmp(SigName,'AllSig')),
ivan@78:   y = sqrt(abs(t - .37));
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'Sing') | strcmp(SigName,'AllSig')),
ivan@78:   k = floor(N * .37);
ivan@78:   y = 1 ./abs(t - (k+.5)/N);
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'HiSine') | strcmp(SigName,'AllSig')),
ivan@78:   y = sin( pi * (N * .6902) .* t);
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'LoSine') | strcmp(SigName,'AllSig')),
ivan@78:   y = sin( pi * (N * .3333) .* t);
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'LinChirp') | strcmp(SigName,'AllSig')),
ivan@78:   y = sin(pi .* t .* ((N .* .125) .* t));
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'TwoChirp') | strcmp(SigName,'AllSig')),
ivan@78:   y = sin(pi .* t .* (N .* t)) + sin((pi/3) .* t .* (N .* t));
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'QuadChirp') | strcmp(SigName,'AllSig')),
ivan@78:   y = sin( (pi/3) .* t .* (N .* t.^2));
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'MishMash') | strcmp(SigName,'AllSig')),  
ivan@78:   % QuadChirp + LinChirp + HiSine
ivan@78:   y = sin( (pi/3) .* t .* (N .* t.^2)) ;
ivan@78:   y = y +  sin( pi * (N * .6902) .* t);
ivan@78:   y = y +  sin(pi .* t .* (N .* .125 .* t));
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'WernerSorrows') | strcmp(SigName,'AllSig')),
ivan@78:   y = sin( pi .* t .* (N/2 .* t.^2)) ;
ivan@78:   y = y +  sin( pi * (N * .6902) .* t);
ivan@78:   y = y +  sin(pi .* t .* (N .* t));
ivan@78:   pos = [ .1 .13 .15 .23 .25 .40 .44 .65  .76 .78 .81];
ivan@78:   hgt = [ 4  5   3   4  5  4.2 2.1 4.3  3.1 5.1 4.2];
ivan@78:   wth = [.005 .005 .006 .01 .01 .03 .01 .01  .005 .008 .005];
ivan@78:   for j =1:length(pos)
ivan@78:     y = y + hgt(j)./( 1 + abs((t - pos(j))./wth(j))).^4;
ivan@78:   end 
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: if(strcmp(SigName,'Leopold') | strcmp(SigName,'AllSig')),
ivan@78:   y = (t == floor(.37 * N)/N); 		% Kronecker
ivan@78: end;
ivan@78: x = [x;y];
ivan@78: y = [];
ivan@78: 
ivan@78: %  disp(sprintf('MakeSignal: I don*t recognize << %s>>',SigName))
ivan@78: %  disp('Allowable SigNames are:')
ivan@78: %  disp('AllSig'),
ivan@78: %  disp('HeaviSine'),
ivan@78: %  disp('Bumps'),
ivan@78: %  disp('Blocks'),
ivan@78: %  disp('Doppler'),
ivan@78: %  disp('Ramp'),
ivan@78: %  disp('Cusp'),
ivan@78: %  disp('Crease'),
ivan@78: %  disp('Sing'),
ivan@78: %  disp('HiSine'),
ivan@78: %  disp('LoSine'),
ivan@78: %  disp('LinChirp'),
ivan@78: %  disp('TwoChirp'),
ivan@78: %  disp('QuadChirp'),
ivan@78: %  disp('MishMash'),
ivan@78: %  disp('WernerSorrows'),
ivan@78: %  disp('Leopold'),
ivan@78: %end