Image:Pink noise spectrum.png

[edit] Summary

Description	Spectrum analysis of the uncompressed source for 10 seconds of pink noise file— play in browser. Analysis done using Audacity, plotting with GnuPlot
Source	en:Image:Pink noise spectrum.png
Date	01:45, 14 March 2006
Author	en:User:Ktims
Permission (Reusing this image)	This image has been (or is hereby) released into the public domain by its author, Ktims at the Wikipedia project. This applies worldwide. In case this is not legally possible: Ktims grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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[edit] Description

[edit] Instructions

Obtain the frequency analysis from Audacity, set the maximum number of windows, and use a Hamming window. The following script was used to generate the image:

set terminal png transparent font "/usr/share/fonts/truetype/ttf-bitstream-vera/Vera.ttf" size 800,600 enhanced
set output "pink_noise_spectrum.png"

# this seems to fix the trailers on the TTF font for the x-label
set bmargin 4

# enable grid
set grid
set grid mxtics

# set up x-axis
set logscale x 10
set xrange [100:22000]
set xlabel "Frequency (Hz)"
set xtics border nomirror

# set up y-axis
set yrange [-40:0]
set ylabel "Intensity (dB)"
set ytics border nomirror

# again to deal with bad bboxes on the TTF...
set key height 1 box

# plot the output from Audacity
plot "pink_noise.txt" title "Pink Noise" with filledcurves x1 3

Les pages ci-dessous contiennent cette image :

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