Image:Dba plot.png

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[edit] Second revision

This was created using the following gnuplot source:

kA = 7.397057228624818216e9
H(s) = kA*s**4 / ((s+129.4)**2 * (s+676.7) * (s+4636) * (s+76655)**2)
dba(f) = 20 * log10(abs(H(2 * {0.0,1.0} * pi * f)))

set size square
set grid
set logscale x 10
set xlabel "Frequency (Hz)"
set ylabel "Gain (dB)"

plot [10:39999] (x>2e4)? 0/0 : dba(x) lt 3 notitle

See also User_talk:MarkSweep/archive2#Gnuplot, commons:Image:Weighting curves.png

This image has been (or is hereby) released into the public domain by its creator, MarkSweep. This applies worldwide. In case this is not legally possible, the creator grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. Subject to disclaimers.

[edit] First revision

(http://upload.wikimedia.org/wikipedia/en/archive/d/d3/20050317071653%21Dba_plot.png)

I made this. It is public domain. See my page for details. - Omegatron 01:37, Mar 5, 2005 (UTC)

Replacement for Image:DBA.gif

Created with maxima (or gnuplot, I guess) and edited in the GIMP, since I don't have the patience to scour documentation for things I am only going to use once or twice.

H:(kA*s^4)/((s+129.4)^2*(s+676.7)*(s+4636)*(s+76655)^2);
H:ev(H,s=%I*w);
H:ev(H,kA=7.397057228624816E+9);
H:ev(H,w=2*%PI*f);
SET_PLOT_OPTION([GNUPLOT_PREAMBLE, "set log x"]);
plot2d(20*log10(abs(H)),[f,10.1,20000]);

No, I don't know what I'm doing.

with my custom functions (in maxima-init.mac):

convert voltage gain to decibels:

db(x):=float(20*log(x)/log(10));

convert decibels to voltage gain:

idb(x):=float(10^(x/20));

electrical elements in parallel:

INFIX("||")$ "||"(x,y):=x*y/(x+y);

This image has been (or is hereby) released into the public domain by its creator, Omegatron. This applies worldwide. In case this is not legally possible, the creator grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. Subject to disclaimers.

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