File:Electronic linear filters.svg
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此SVG文件的PNG预览的大小：750 × 600像素。 其他分辨率：300 × 240像素 | 600 × 480像素 | 960 × 768像素 | 1,280 × 1,024像素 | 2,560 × 2,048像素 | 1,200 × 960像素。
原始文件 （SVG文件，尺寸为1,200 × 960像素，文件大小：32 KB）
摘要
| 描述 |
English: This picture shows the frequency response of all the classic electronic filters of 5th order.
They can be both analog or digital: the output is the same. The first one is the Butterworth filter, that is the smoothest one but it has no ripples. The last one is the Elliptic filter: it is the sharpest one but it shows ripples in both the pass-band and the stop-band. The two Chebyshev filter in the middle have an average behavior, being quite sharp with ripples in part of the spectrum. All the plots have been obtained using the same parameters and the same number of coefficients, thus showing only the properties of the different filters. |
| 日期 | |
| 来源 | 自己的作品 |
| 作者 | Alessio Damato |
| SVG开发 | |
| 源代码 | Gnuplot code# set the output
set terminal svg enhanced size 1200 960 fname "Times" fsize 25
set output "Electronic_linear_filters.svg"
# axis properties
set xrange [0:1]
set yrange [0:1.1]
set xtics axis
set xtics axis
set key off
# Set up a four-pane multiplot
set size 1,1
set origin 0,0
set multiplot
set title "Butterworth"
set size 0.5,0.5
set origin 0,0.53
plot "electronic_filters.dat" using 1:2 with lines linewidth 3
set title "Chebyshev type 1"
set size 0.5,0.5
set origin 0.5,0.53
plot "electronic_filters.dat" using 1:3 with lines linewidth 3
set title "Chebyshev type 2"
set size 0.5,0.5
set origin 0,0.03
plot "electronic_filters.dat" using 1:4 with lines linewidth 3
set title "Elliptic"
set size 0.5,0.5
set origin 0.5,0.03
plot "electronic_filters.dat" using 1:5 with lines linewidth 3
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本文件已被Filters order5.svg取代。建议您使用其他文件。请注意，删除被取代的图片需要达成一致。 使用其他文件的理由：“The plotlines of this file are jagged. New version with clean plotlines is available.”
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Matlab source code
In order to make it, first I created a file called electronic_filters.dat with the following Matlab code:
% order of the filters
N = 5;
% cut-off normalized frequency
band = 0.5;
% ripple in the pass-band (dB)
Rpass = 0.5;
% ripple in the stop-band (dB)
Rstop = 20;
w = 0:pi/255:pi;
[num, den] = butter(N, band, 'low');
butterfilter = abs(freqz(num, den ,w));
[num, den] = cheby1(N, Rpass, band);
cheby1filter = abs(freqz(num, den ,w));
[num, den] = cheby2(N, Rstop, band);
cheby2filter = abs(freqz(num, den ,w));
[num, den] = ellip(N, Rpass, Rstop, band);
ellipfilter = abs(freqz(num, den ,w));
F = [w/pi ; butterfilter; cheby1filter; cheby2filter; ellipfilter];
F = F';
save -ascii 'electronic_filters.dat' F;
Then I created the plot with Gnuplot
许可协议
我，本作品著作权人，特此采用以下许可协议发表本作品：
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已授权您依据自由软件基金会发行的无固定段落及封面封底文字（Invariant Sections, Front-Cover Texts, and Back-Cover Texts）的GNU自由文件许可协议1.2版或任意后续版本的条款，复制、传播和／或修改本文件。该协议的副本请见“GNU Free Documentation License”。 |
  
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| 本许可协议标签作为GFDL许可协议更新的组成部分被添加至本文件。 |
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文件历史
点击某个日期/时间查看对应时刻的文件。
| 日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
|---|---|---|---|---|---|
| 当前 | 2012年10月18日 (四) 15:30 | | 1,200 × 960（32 KB） | wikimediacommons>Spinningspark | Fix broken rendering by resaving from Inkscape |
