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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: THANKS A LOT!!! posted by surgeonx on September 21, 2001 at 22:22:49:
it is:"Why the name "pink noise"? We all know that the 'color' white reflects all the colors in the spectrum, while black 'sucks' up all light. The color pink reflects almost all the light in the spectrum, apart from the pink light. In acoustics this has been translated tp sound.White noise 'reflects' all frequencies in the spectrum equally much (for instance within the audible area of 20 Hz til 20.000 Hz...that is: I can't hear much above 15 kHz, which is pretty normal at my age...33). Thus, white noise is a flat frequency spectrum, and sounds something like a roaring waterfall. Black sound (often called "digital black" on test CDs etc.) is total silence; i.e. no frequencies are 'reflected'. Pink Noise color the reflected sound spectrum just slightly. For every increased octave in the spectrum, the 'sound level'is reduced by ca. 3 dB. This sounds almost like white noise, but it doesn't sound as 'sharp' and 'noisy'. Pink Noise is often used by sound technicians etc. to calibrate sound equipment, i.e. to check that the equipment plays back the sounds that it is supposed to do, and does not color the sound in an unintended way. Therefore we all (at least here in Scandinavia) know the sound of pink noise (and white noise) from the flickering TV-screen after transmissions at night, or also when the 'test image' is shown during daytime. PS. The volume on this clip is low, due to the energy being spread out evenly in the spectrum, and because I haven't figured out how to adjust the input volume when recording on my Mac. You therefore might need to turn your output volume up, or listen with headset."
and;
"Pink noise has the same distribution of power for each octave, so the power between 0.5 Hz and 1 Hz is the same as between 5,000 Hz and 10,000 Hz."and try here:
http://www.siglab.ece.umr.edu/ee301/dsp/basics/rand.html#PGN
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Follow Ups
- bad grrrl rock!... no, seriously... - drclark 09:21:16 09/22/01 (0)
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