Pink/White Noise
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Posted on Dec 12, 2003 02:17 am
Loki
Cone Poker
Member Since: Apr 07, 2002
what is the difference?
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WaltChief Cook and Bottle WasherMember
Since: May 10, 2002
Dec 12, 2003 06:33 am Loki,
You would do this! I hates it when I forgets stuff! They both have a unique purpose. If I remember at all, white noise is generated and broadcast over office PA systems to dampen other minor noises and create a psedu sense of silance. Now watch that will be the pink! Darn I used to know pink.
Naw, I done guessin. It will be fun to see who remembers.
juesContributor
Since: Dec 30, 2002
Dec 12, 2003 07:05 am brown noise is the best.
WaltChief Cook and Bottle WasherMember
Since: May 10, 2002
Dec 12, 2003 08:02 am Jues? I say, I say, whats wrong with that boy?
juesContributor
Since: Dec 30, 2002
Dec 12, 2003 08:48 am an extremly technical but accurate description of all the various "colours" of noise:
www.ptpart.co.uk/colors.htm
TadpuiI am not a crook's headMember
Since: Mar 14, 2003
Dec 12, 2003 09:12 am What do they mean when they say that a frequency range does not include DC?
I like the quote about orange noise:
"Orange noise is most easily generated by a roomfull of primary school students equipped with plastic soprano recorders."
I also take it that black noise doens't actually exist? I mean, wtf is silent noise? Must be the sound that one hand clapping makes. :)
WaltChief Cook and Bottle WasherMember
Since: May 10, 2002
Dec 12, 2003 09:25 am Oh this is getting good.
DC noise theoreticly does not exist. In as much as most speakers are a big coil or electomagnet they should not vibrate and move air with a constant current applied to them. Just suck up every paper clip in the room. This is not accurate as most amp speaker systems will respond very adversly to dc and create ugly noise, of course while collecting paper clips.
TadpuiI am not a crook's headMember
Since: Mar 14, 2003
Dec 12, 2003 09:40 am Oh, I think I see. So, like where Alternating Current will produce a push/pull for a speaker, therefore creating sound waves, Direct current will just push or pull and stay that way until its turned off?
WaltChief Cook and Bottle WasherMember
Since: May 10, 2002
Dec 12, 2003 12:12 pm Yup, you got it! As the changing current of an audio wave runs through the coils the magnetic flux changes and moves the iorn core inside the coil which then moves the speaker cone and finally the air.
A microphone is the exact opposite. The moving air vibrates a diaphram of some sort. That movinging diaphram either through a capacitor, crystal, or coil will create electrical pulses in the wire.
TadpuiI am not a crook's headMember
Since: Mar 14, 2003
Dec 12, 2003 02:09 pm OK, so in terms of their statements that "this frequency range does not include DC", would that mean that the frequency is so fast that there is no perceptible alternation of current and it acts like a direct current? Or that it is alternating faster than the speaker can react to it?
I'm curious what brown noise would sound like. If it has -6dB per octave, then would it just be low frequency noise?
Oh, and I found what black noise sounds like: www.integralmusic.com/
teehee
WaltChief Cook and Bottle WasherMember
Since: May 10, 2002
Dec 12, 2003 02:34 pm No DC present simply means that only AC current has been coupled to the output. Some signals will "ride" on a DC voltage often refered to as bias. A DC bias current is necessary for an amplifier to work with. Generally the DC is blocked prior to transmission to the speakers.
The statement has no meaning per my understanding as DC would be a 0Hz signal or no speaker movement. Maybe they where trying to emphize that all frequencies except zero where represented. Odd notation.
Apr 13, 2005 04:01 pm lol you guys drifted a bit...
basically white noise is all frequencies at one level, so if you look at it on a spectragraph, it'll look like a hill....the thing is, the lows tend to roll off because it requires more energy to reproduce them......this is were pink noise comes in. pink noise is all frequencies at the same audible level. on a spectragraph pink noize will be flat..
both sound like the tv turned to channel 1
Apr 13, 2005 04:04 pm yup that's right, i'm so bored and these boards have been so dead lately, i'm bringin' up old topics...
pjkPrince CZAR-mingMember
Since: Apr 08, 2004
Apr 13, 2005 04:05 pm good tidbit of knowledge there!
Apr 13, 2005 04:06 pm yeah, traffic is really odd lately, a few busy days, then slowing, then picking up...it's a bummer, it's like summer is coming or something...oh, wait...
Noize2uCzar of MidiAdministrator
Since: Apr 04, 2002
Apr 13, 2005 11:44 pm Man, you guys gotta find some other stuff to do during the day.
Na, wait, I wish I had the time to slip in here during the day. But I get by coming in at night.
By they way WYD, nice description though.
