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Violet aka purple noise power density increases 6 dB per octave with increasing frequency over the frequency range. It is also known as differentiated white noise, due to its being the result of the differentiation of a white noise signal.
I created this by looping http://en.wikipedia.org/wiki/File:Purple_noise.ogg. Which is copylefted, however I claim that they can't be protected based on http://en.wikipedia.org/wiki/Threshold_of_originality (check language sidebar on Wikipedia page for other jurisdictions)
Type
Ogg Vorbis (.ogg)
Duration
5:00.000
File size
2.7 MB
Sample rate
48000.0 Hz
Bitrate
74 kbps
Channels
Mono