Image:Gaussian white noise.ogg
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Gaussian_white_noise.ogg (Ogg Vorbis sound file, length 10s, 71kbps)
| This is a file from the Wikimedia Commons. The description on its description page there is shown below.
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| Description | 10 seconds of Gaussian (normally-distributed) white noise with an RMS value of -13.2 dB.
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See Image:White noise.ogg for details on generation and conversion. Instead of rand(), this uses randn(), which generates normally distributed random values centered about 0. So to generate 10 seconds of noise sampled at 48 kHz: gwn=randn(48000*10,1); The wavwrite() function expects values in [-1.0, 1.0), so, for lack of a better idea, I just normalized the data to this range: gwn=gwn/(max(abs(gwn))); wavwrite(gwn,48000,16,'white noise normal.wav'); So the normally-distributed version is somewhat quieter than the uniformly-distributed version. (According to SoX, there is an 8.4 dB difference, but it sounds around 4.5 dB.) I can fix this later, but I'll wait until after I've done all the other noise colors to see if it's worth trying to make them all the same RMS amplitude, or if this will require them to be too quiet. The pristine, lossless file is accessible in File history, while the smaller lossy file is the one included in articles. |
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| Permission (Reusing this image) |
(In short, this means that you can copy and modify the image freely as long as you provide attribution; preferably in the form of a link back to this page.) |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 03:51, 21 April 2008 | 10s (87 KB) | Omegatron | (Lossy Ogg Vorbis version) |
| 03:50, 21 April 2008 | 10s (894 KB) | Omegatron | (Lossless FLAC-encoded version) |
