diff aim-mat/modules/nap/twodat2003/gen_twoDat2003b.m @ 0:74dedb26614d

Initial checkin of AIM-MAT version 1.5 (6.4.2011).

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/aim-mat/modules/nap/twodat2003/gen_twoDat2003b.m	Fri May 20 12:32:31 2011 +0100
@@ -0,0 +1,297 @@
+% generating function for 'aim-mat'
+% 
+%   INPUT VALUES:
+%  
+%   RETURN VALUE:
+%
+% 
+% (c) 2011, University of Southampton
+% Maintained and written by Stefan Bleeck ([e-mail])
+% http://www.soton.ac.uk/aim
+
+
+
+
+function ret=gen_twoDat2003(bmm,options)
+% two D adaptive thresholding
+
+% first do the normal nap:
+nap=gen_hcl(bmm,options.nap);
+
+if nargin < 2
+    options=[];
+end
+
+
+vals=getvalues(nap);
+
+
+
+%%%normalise to 0-60dB range
+%max_nap=max(max(vals));
+%nap_norm=60./max_nap;
+%vals=vals*nap_norm;
+%save vals.mat vals;
+
+new_vals=zeros(size(vals));
+nr_chan=size(vals,1);
+nr_dots=size(vals,2);
+sr=getsr(nap);
+cfs=getcf(nap);
+load bmm.mat;
+
+
+% the delays can be set by an option
+if isfield(options,'time_constant_factor') % this is multiplied to the threshold_time_const
+    time_constant_factor=options.time_constant_factor;
+else
+    time_constant_factor=0.8;
+end
+
+if isfield(options,'frequency_constant_factor') % the influence of the left and the right channel
+    frequency_constant_factor=options.frequency_constant_factor;
+else
+    frequency_constant_factor=0.9;
+end
+
+
+if isfield(options,'threshold_rise_constant') % the rate at which the threshold may rise
+    threshold_rise_constant=options.threshold_rise_constant;
+else
+    threshold_rise_constant=1;
+end
+
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%the following calculates the envelope of nap response
+%out_li=zeros(nr_chan,nr_dots);
+%for chan=1:nr_chan
+%out_li(chan,:)=standard_leaky_integrator(vals(chan,:),0.003,1,16000);
+%out_li_scale=max(vals(chan,:))./max(out_li(chan,:));
+%out_li(chan,:)=out_li(chan,:).*out_li_scale;
+%end
+%[ERB_no, dummy] = Freq2ERB(cfs);
+%for chan=1:nr_chan
+%out_li(chan,:)=standard_leaky_integrator(vals(chan,:),0.003,1,16000);
+%out_li_scale=max(vals(chan,:))./max(out_li(chan,:));
+%out_li(chan,:)=out_li(chan,:).*out_li_scale;
+%end
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+
+save cfs.mat cfs;
+order = 4;
+[rate ERB] = Freq2ERB(cfs);
+B=1.019.*ERB;
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%note: decay of gammatone is described by: exp(-2*pi*B*t)
+% time to drop to 1/2 (6dB) --in seconds
+%i.e. exp(-2*pi*B*t)=0.5
+drop6dbtime=-log(0.5)./(2*pi.*B);
+
+% this means so many per samplepoint
+threshold_decay_constant=-log10(2)*20./(drop6dbtime*sr);
+threshold_decay_constant=threshold_decay_constant./time_constant_factor;
+
+
+
+
+threshold_rise=(100.*B.^0.9)./sr; 
+threshold_rise=threshold_rise.*threshold_rise_constant;
+%threshold_rise=zeros(nr_chan);
+
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%calc frequency slope values
+if nr_chan>1
+    %frequency_slope_c=calcfreqslope(cfs(2),cfs(1));
+    %frequency_slope_a=calcfreqslope(cfs(1),cfs(2));
+    
+    %c is effect from channel above but we must input
+    %the higher frequency (2) as the adjacent band and
+    %the channel in which we want the level (1)as 
+    %the centre freq
+    frequency_slope_c=calcfreqslope(cfs(1),cfs(2));
+    
+    %a is effect from channel below but we must input
+    %the lower frequency (1) as the adjacent band and
+    %the channel in which we want the level (2) as 
+    %the centre freq
+    frequency_slope_a=calcfreqslope(cfs(2),cfs(1));
+    
+else
+    frequency_slope_c=0;
+    frequency_slope_a=0;
+end
+
+%we divide by the frequency_constant_factor because we want a
+%frequency_constant_factor of 1 to mean we use the actual
+%frequency slope and a frequency_constant_factor of 0.5
+%to mean that the frequency slope falls away at twice the rate
+%i.e. less effect
+frequency_slope_c=frequency_slope_c./frequency_constant_factor;
+frequency_slope_a=frequency_slope_a./frequency_constant_factor;
+
+
+
+
+oldfigure=gcf;
+if nr_chan==1
+	onechannelfigure=figure(3);	% assuming, the other one is 1
+end
+
+% channel_select=1:nr_chan;
+times_per_ms=round(sr*0.01);
+if nr_chan>1
+	waithand=waitbar(0,'generating 2dat');
+end
+
+
+
+val_e=zeros(nr_chan,nr_dots);
+val_inp=zeros(nr_chan,nr_dots);
+val_thres=zeros(nr_chan,nr_dots);
+
+
+
+
+% a is the decayed working variable from the channel above
+% b is the range limit
+% c is the decayed working variable from the channel below
+% d is the delayed and decayed nap signal from on-channel
+% e is the maximum of [a b c d]
+% threshold is the working variable
+% thresholdlast is the working variable in the last round
+% inp is the current input
+
+
+thresholdlast=zeros(nr_chan,1);
+threshold=zeros(nr_chan,1);
+a=0;b=1;c=0;d=0;e=0;
+
+
+
+for ii=1:nr_dots % through the time
+	if nr_chan>1
+		if mod(ii,times_per_ms)==0
+			waitbar(ii/nr_dots);
+		end
+	end
+    
+    for jj=1:nr_chan  % through all channels: prepare working variable
+        inp=vals(jj,ii);% current input
+        
+        if jj< nr_chan          
+            chan_above=thresholdlast(jj+1);
+            a=chan_above+frequency_slope_a;
+        else
+            a=0;
+        end
+        if jj>1
+            chan_below=thresholdlast(jj-1);
+            c=chan_below+frequency_slope_c;
+        else
+            c=0;
+        end
+             
+        %a=0;
+        %c=0;
+        
+       
+        
+        
+        d=max(thresholdlast(jj)+threshold_decay_constant(jj),0);
+        
+        
+        e1=max(a,b);   
+        e2=max(c,d);
+        e=max(e1,e2);   
+        
+        
+               
+        
+        if inp>e   %threshold is exceeded
+            
+           threshold(jj)=min(thresholdlast(jj)+threshold_rise(jj),inp);
+           %threshold(jj)=inp; 
+           
+            %new_vals(jj,ii)=threshold(jj)-e;
+           new_vals(jj,ii)=inp-threshold(jj);
+            %    % else threshold decays
+            else
+            threshold(jj)=e; 
+            new_vals(jj,ii)=0;  
+        end
+    
+             
+        
+         val_e(jj,ii)=e;
+         val_inp(jj,ii)=inp;
+         val_thres(jj,ii)=threshold(jj);
+        
+                               
+    end
+    
+    
+    
+    
+    
+    % prepare next round 
+    if ii< nr_dots                   
+    thresholdlast=threshold;
+    end
+    
+    if nr_chan==1
+        tvals(ii)=thresholdlast;
+    end
+    
+    
+end
+
+
+
+
+
+if nr_chan==1
+    figure(onechannelfigure);
+    plot(nap);
+    hold on
+    a=plot(tvals,'r');
+    set(a,'LineWidth',1.5);
+end
+
+
+nap=setvalues(nap,new_vals);
+%save nap.mat nap;
+
+vals=getvalues(nap);
+nap=setallmaxvalue(nap,max(max(vals))*2);
+nap=setallminvalue(nap,min(min(vals)));
+
+
+
+%save val_e.mat val_e;
+%save new_vals.mat new_vals;
+%save val_inp.mat val_inp;
+%save val_thres.mat val_thres;
+
+
+
+
+
+
+
+ret=nap;
+if nr_chan>1
+	close(waithand);
+end
+
+figure(oldfigure);
\ No newline at end of file