tomwalters@0: %  
tomwalters@0: % function sig=gen_multiramp(carriers,halflifes,reprate,signal_length, sample_fq)
tomwalters@0: %
tomwalters@0: %   Generates a superposition of ramped sinusiod signals
tomwalters@0: %
tomwalters@0: %   INPUT VALUES:
tomwalters@0: % 		carriers        carrier frequences (vector)
tomwalters@0: %       halflifes       (vector, same length as carriers)
tomwalters@0: %       reprate         frequence of envelope
tomwalters@0: %       signal_length   in seconds !!!
tomwalters@0: %       sample_fq       sample frequence 		
tomwalters@0: %
tomwalters@0: %   RETURN VALUE:
tomwalters@0: %		sig             object signal
tomwalters@0: %		
tomwalters@0: % 
bleeck@3: % (c) 2011, University of Southampton
bleeck@3: % Maintained by Stefan Bleeck (bleeck@gmail.com)
bleeck@3: % download of current version is on the soundsoftware site: 
bleeck@3: % http://code.soundsoftware.ac.uk/projects/aimmat
bleeck@3: % documentation and everything is on http://www.acousticscale.org
tomwalters@0: 
tomwalters@0: function sig=gen_multiramp(carriers,halflifes,reprate,signal_length, sample_fq)
tomwalters@0: if nargin < 4
tomwalters@0:     signal_length=0.128;
tomwalters@0: end
tomwalters@0: if nargin < 3
tomwalters@0:     reprate=62.5;   
tomwalters@0: end
tomwalters@0: if nargin < 2
tomwalters@0:     hlsteps=8;
tomwalters@0:     halflives=distributelogarithmic(0.064,0.0005,hlsteps);
tomwalters@0: else
tomwalters@0:     hlsteps=length(halflifes);
tomwalters@0: end
tomwalters@0: if nargin < 1
tomwalters@0:     carsteps=5;
tomwalters@0:     carriers=distributelogarithmic(250,4000,carsteps);
tomwalters@0: else
tomwalters@0:     carsteps=length(carriers);
tomwalters@0: end
tomwalters@0: 
tomwalters@0: 
tomwalters@0: sr = sample_fq;
tomwalters@0: % sr=16000;
tomwalters@0: % signal_length=0.264-1/sr;
tomwalters@0: sig=signal(signal_length,sr);
tomwalters@0: 
tomwalters@0: for i=1:hlsteps
tomwalters@0:     for j=1:carsteps
tomwalters@0:         current_carrier=carriers(j);
tomwalters@0:         halflife=halflifes(i);
tomwalters@0:         sig=generaterampsinus(sig,current_carrier,reprate,1,halflife);
tomwalters@0:         
tomwalters@0:         if j==1
tomwalters@0:             gsig=sig;
tomwalters@0:         else
tomwalters@0:             gsig=gsig+sig;
tomwalters@0:         end
tomwalters@0:     end
tomwalters@0:     
tomwalters@0:     if i==1
tomwalters@0:         tsig=gsig;
tomwalters@0:     else
tomwalters@0:         tsig=append(tsig,gsig);
tomwalters@0:     end
tomwalters@0:     
tomwalters@0: end
tomwalters@0: % savewave(tsig,'tsig');
tomwalters@0: 
tomwalters@0: 
tomwalters@0: sig=tsig;