File:Gaussian white noise.ogg
Gaussian_white_noise.ogg (Ogg Vorbis sound file, length 10 s, 71 kbps)
This is a file from the Wikimedia Commons. The description on its description page there is shown below.
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DescriptionGaussian white noise.ogg | 10 seconds of Gaussian (normally-distributed) white noise with an RMS value of -13.2 dB. | ||
Date | |||
Source |
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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Author | Omegatron | ||
Permission (Reusing this file) |
I, the copyright holder of this work, hereby publish it under the following licenses: This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.
You may select the license of your choice. |
Items portrayed in this file
depicts
21 April 2008
File history
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Date/Time | Dimensions | User | Comment | |
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current | 20:51, 20 April 2008 | 10 s (87 KB) | Omegatron | Lossy Ogg Vorbis version |
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Software used | Xiph.Org libVorbis I 20070622 |
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