Image:Quanterr.png

[edit] Summary

[edit] Source Code

close all; figure
t = 0:0.0001:2;
   % generate some nice looking signal then scale to +/- 1
x = 2*cos(2*pi*t)+1.5*cos(4*pi*t+2)+1*cos(5*pi*t)+0.5*cos(10*pi*t);
x = 2*(x - min(x))/(max(x)-min(x)) - 1;
   % quantization
n = 2; % bits 
xq = floor((1-1e-12)*(x+1).*2.^(n-1));
xq = xq / (2^(n-1));
xq = xq - (2^n - 1) / 2^n;
   % error signal
qerr = x - xq;
   % plot
subplot(211); plot(t,x,'b',t,xq,'r'); title('Original and Quantized Signal');
subplot(212); plot(t,qerr,'b'); title('Quantization Error');

[edit] Licensing

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• Quantization error