k - spsc - Graz University of Technology
k - spsc - Graz University of Technology
k - spsc - Graz University of Technology
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SPSC – Signal Processing & Speech Communication Lab<br />
Decimation<br />
if passband width <strong>of</strong> V(e jω ) is narrow<br />
output signals y k<br />
(n) are narrowband lowpass signals<br />
this means, that yk(n) varies slowly with time<br />
According to this variying nature, one can exploit that to decimate the<br />
output.<br />
Decimation Ratio <strong>of</strong> M = moving the window v(k) by M samples at a time<br />
if filters have equal bandwidth<br />
<br />
n k<br />
= M<br />
maximally decimated analyses bank<br />
figure 7: Analysis bank with decimators<br />
Pr<strong>of</strong>essor Georg Holzmann, Horst Cerjak, Christian 19.12.2005 Wallinger 12.06.07 Wavelet T. - Relation to Filter Banks<br />
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