diff utilities/UTIL_CAPgenerator.m @ 38:c2204b18f4a2 tip

End nov big change

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utilities/UTIL_CAPgenerator.m	Mon Nov 28 13:34:28 2011 +0000
@@ -0,0 +1,64 @@
+function wholeNerveCAP  = UTIL_CAPgenerator...
+    (ANresponse, dt, BFlist, numANfibers, plotCAP)
+% 
+% Generates a compound action potential by convolving an impulse repsonse,
+% as defined by Mark Chertoff (2004, JASA), with the response of the 
+% auditory nerve.
+%
+%
+% -e(-k*time)*SIN(2*PI()*f*time)
+%
+% mu(t) = e^-kt * sin(omega*t)
+% omega = 2 * pi * f
+%
+%
+% Robert T. Ferry
+% 01st May 2008
+%
+%
+
+nChannels=length(BFlist);
+[r nSpikeEpochs]=size(ANresponse);
+
+wholeNerveCAP       = [];
+channelCAP          = [];
+e                   = exp(1);
+k                   = 1000;
+impulseDuration     = 0.01;
+impulseFrequency    = 750;
+impulseTime         = dt:dt:impulseDuration;
+impulseResponse     = -e.^(-k*impulseTime).*sin(2*pi*impulseFrequency*impulseTime);
+impulseResponse=impulseResponse-mean(impulseResponse);
+
+% WholeNerveCAP
+ANoutput = sum(ANresponse, 1);
+convolvedWholeNerveCAP = conv(ANoutput, impulseResponse(1,:));
+% truncate
+convolvedWholeNerveCAP=convolvedWholeNerveCAP(1:nSpikeEpochs);
+
+% apply measurement time constant
+sampleRate=1/dt;
+upperFreq=sampleRate/4;
+lowPassCutOff=40;
+wholeNerveCAP = UTIL_Butterworth(convolvedWholeNerveCAP, dt, lowPassCutOff, upperFreq, 1);
+% or do not do this
+% wholeNerveCAP = convolvedWholeNerveCAP;
+
+% Plot output?
+
+CAPtime = dt:dt:dt*length(wholeNerveCAP);
+
+if (plotCAP == 1)
+    figure(9)
+
+    subplot(3,1,1), plot(impulseTime, impulseResponse)
+    title('Impulse response')
+    xlabel('Time (s)'), ylabel('Amplitude (Pa)')
+    xlim([0 max(impulseTime)]), ylim([-inf inf])
+	
+    subplot(3,1,2), plot(CAPtime, wholeNerveCAP)
+    title(['AN CAP (whole-nerve)  '   num2str(length(BFlist)) ' channels' num2str(numANfibers) ' fibers/ch'])
+    xlabel('Time (s)'), ylabel('Amplitude (Pa)')
+    xlim([0 max(CAPtime)]), ylim([-inf inf])   
+	
+end