jfriedt / IFCS2018 article

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illustration quantification

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ifcs2018_proceeding.tex
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... ... @@ -96,8 +96,17 @@
96 96 \begin{figure}[h!tb]
97 97 \includegraphics[width=\linewidth]{images/float-vs-integer.pdf}
98 98 \caption{Impact of the quantization resolution of the coefficients}
  99 +%\label{float_vs_int}
  100 +\end{figure}
  101 +
  102 +\begin{figure}[h!tb]
  103 +\includegraphics[width=\linewidth]{images/demo_filtre}
  104 +\caption{Impact of the quantization resolution of the coefficients: the quantization is
  105 +set to 6~bits, setting the 30~first and 30~last coefficients out of the initial 128~band-pass
  106 +filter coefficients to 0.}
99 107 \label{float_vs_int}
100 108 \end{figure}
  109 +
101 110  
102 111 \section{Filter optimization}
103 112  
images/demo_filtre.eps
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images/demo_filtre.m
Diff comments   View file @ ee2ff04
  1 +pkg load signal
  2 +close all
  3 +clear all
  4 +
  5 +d=firls(128,[0 .2 .3 .4 .5 1],[0 0 1 1 0 0]);
  6 +d=d/max(d);
  7 +plot(d)
  8 +N=6;
  9 +k=find(abs(d)<2^(-N))
  10 +hold on
  11 +plot(k,0,'r.')
  12 +line([1 128],[2^(-N) 2^(-N)])
  13 +line([1 128],[-2^(-N) -2^(-N)])
  14 +legend('filter coefficients',[num2str(N),' bit quantization'])
  15 +kk=find(diff(k)>1);
  16 +k(kk(1))
  17 +k(kk(end))
  18 +xlabel('cofficient num');ylabel('normalized coef. value')
  19 +line([0 k(kk(1))],[0.1 0.1])
  20 +line([k(kk(end)) 128],[0.1 0.1])
  21 +text(10,0.15,'30 coefs at 0')
  22 +text(110,0.15,'30 coefs at 0')
images/demo_filtre.pdf
Diff comments   View file @ ee2ff04
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