File:G712 butterworth.svg
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![File:G712 butterworth.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/95/G712_butterworth.svg/512px-G712_butterworth.svg.png?20120627141630)
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[edit]DescriptionG712 butterworth.svg |
English: Butterworth filter approximation for CCITT G712 specification |
Date | |
Source | Own work |
Author | Fcorthay |
SVG development InfoField |
Source code
[edit]This graphics has been realized with the help of the following Octave script:
#------------------------------------------------------------------------------- # Specifications # fs = 40E3; fPass = 3000; rPass = 0.125; fStop1 = 4000; rStop1 = 14; fStop2 = 4600; rStop2 = 32; pointNb = 1000; AdbMin = 40; makeGraphics = 1; figureIndex = 0; #------------------------------------------------------------------------------- # Denormalized filter function # order = 13; wLog = 2*pi*logspace(2, 5, pointNb); fc = 0.87; [num, den] = butter(order, 2*pi, 's'); while ( length(num) < length(den) ) num = [0, num]; endwhile; for index = 1:order+1 num(index) = num(index) * (fPass/fc)^(index-1); den(index) = den(index) * (fPass/fc)^(index-1); endfor Adb = 20*log10(abs(freqs(num, den, wLog))); Adb(Adb < -AdbMin) = -AdbMin; figureIndex = figureIndex+1; figure(figureIndex); semilogx(wLog/(2*pi), Adb); hold on; semilogx([wLog(1)/(2*pi), fPass, fPass], -[rPass, rPass, AdbMin], 'r'); semilogx([fStop1, fStop1, fStop2, fStop2, wLog(length(wLog))/(2*pi)], ... -[0 , rStop1, rStop1, rStop2, rStop2 ], 'r'); hold off; axis([wLog(1)/(2*pi), wLog(length(wLog))/(2*pi), -AdbMin, 0]); grid; xlabel('frequency [Hz]'); ylabel('amplitude [dB]'); if (makeGraphics != 0) print -dsvg g712_butterworth.svg endif
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:16, 27 June 2012 | ![]() | 512 × 384 (21 KB) | Fcorthay (talk | contribs) | {{Information |Description ={{en|1=Butterworth filter approximation for CCITT G712 specification}} |Source ={{own}} |Author =Fcorthay |Date =2012-06-27 |Permission = |other_versions = }} [[Category:Si... |
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