Random Noise
From WikiRecording
Random Noise
These are samples of "random" noise, which are not as random as they first appear.
White Noise
The first sample is White Noise which can be described as including all frequencies at equal levels.
Imagine 20Hz, 21Hz, 22, 23...210, 211, 212...2100, 2101, 2102, etc. all the way up the spectrum at equal volume. You'll notice it sounds somewhat thin and 'bright' because of all those high harmonics present. This sample was recorded at a reference level of -18dBFS.
Pink Noise
Pink Noise can be described as including all frequencies but at steadily decreasing levels.
Pink Noise, is white noise that has been filtered to provide "equal" strength throughout all frequencies, the filter is set at -6db for each octave you go up. It produces a sound that is "mellower" and 'darker' because the higher frequencies are not overpowering the lower ones. Pink Noise is also used to test and balance live sound systems.
