Изображение:Brown noise spectrum.png

Материал из Википедии — свободной энциклопедии

Изображение
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Brown_noise_spectrum.png‎ (5 КБ, MIME-тип: image/png)

Cведения об этом файле находятся на Викискладе, — хранилище изображений и мультимедиа для использования в проектах фонда Викимедиа.

[edit] Summary

Spectrum analysis of the uncompressed source for 10 seconds of brown noise ^{file— play in browser (beta). Note the logarithmic frequency scale.}

The analysis was done using Audacity, and plotting with gnuplot. Transparency was touched up in GIMP to make the graph background pure white.

[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 "brown_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 "brown_noise.txt" title "Brown Noise" with filledcurves x1 3

[edit] Licensing

I, the author of this work, hereby release it into the public domain. This applies worldwide.

In case this is not legally possible:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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Изображение:Brown noise spectrum.png

Материал из Википедии — свободной энциклопедии

[edit] Summary

[edit] Instructions

[edit] Licensing

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