What is pink noise?

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royharper3220

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If its not too complex, would someone please explain what pink noise is? Thanks.
 
In the natural world, there are many physical processes which produce noise with what is known as a "pink" distribution of power. "Pink" noise has an even distribution of power if the frequency is mapped in a logarithmic scale. A straightforward example would be that there is as much noise power in the octave 200 to 400 Hz as there is in the octave 2,000 to 4,000 Hz. Consequently, it seems, our ears tell us that this is a "natural" even noise.
"power" means the average power or energy contained in a signal over a long period of time.
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.

Since power is proportional to amplitude squared, the energy per Hz will decline at higher frequencies at the rate of about -3dB per octave. To be absolutely precise, the rolloff should be -10dB/decade, which is about 3.0102999 dB/octave.
The most obvious use of pink noise is as an audio signal, to be used directly, to be filtered or to be used to modulate something.

Now how does that grab ya
 
Basicly, Pink noise is an automatic eq. how it works is:

first you will need an anyliser (one can be found on the behringer ultra-graph pro).

Get a desent mic and plug it into the anyliser. say a few things. it will automaticy eq to your room so it sounds decent. for more info on it see the glossery at www.modrec.com


good luck,

zeke
 
ZEKE SAYER said:
Basicly, Pink noise is an automatic eq.
No, Pink Noise is a sound. End of story.

But it's uses can be discussed. ;)
 
So what are the uses for pink noise, and what other ways does it concern recording?
 
Hats off to Roy Harper's Question... (a cymbal crashes somewhere in the distance...). Don't some mixers have a built in feature which utilizes pink noise for EQing?
 
From what I understand (and I may be wrong here), you play some pink noise through your monitors or speakers. Then you put a measuring mic at the listening position. The mic is hooked up to an analyzer that shows you graphically the sound energy across the audio spectrum.
You then EQ the signal going to the monitors until there is equal energy across the spectrum, making it so no frequency overpowers any other (flat freq. response.)

EQs can correct a freq response problem, but they add phase problems. The best result comes from good speakers, a neutral room and NO eq.

Oh, in case you cared, white noise is the noise old TVs made when you couldn’t get reception on a channel. Its equal energy at every freq. I think.
 
Gunther said:
Oh, in case you cared, white noise is the noise old TVs made when you couldn’t get reception on a channel. Its equal energy at every freq. I think.
Bingo! :)
 
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