<HTML><FONT FACE=arial,helvetica><HTML><FONT SIZE=2 PTSIZE=10 FAMILY="SANSSERIF" FACE="Arial" LANG="0">In light of recent threads I have a few general observations about white noise. They might be wrong - in which case I'm sure I'll be corrected - and a few of these points are probably common knowledge, but I feel that some on here need reminding.<BR>
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*Most people only need something that sounds like white noise. For instance, a detuned radio. No, it isn't white, but it sounds good enough to mix with a VCO before filtering.<BR>
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*White noise is only necessary (truly white, I mean) for testing, scopes, etc. Most other applications - well, see above.<BR>
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*Obtaining truly white noise is difficult because most components (amplifying, etc) will color the spectrum.<BR>
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*To get truly white noise, why don't we just build massive amounts of sinewave oscillators, record them all tuned hundredths of a cent off and phased slightly off from one another, then layer that recording over them all tuned an increment higher until we have literally every frequency we can generate?<BR>
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*Would this truly white noise not be loopable at whatever smallest number ratio all oscillators have in common?<BR>
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*Truly white noise would have to be scalable - containing all frequencies in the same amplitude, such that if you pitchshifted it up some it would still be white, because all frequencies a human can hear are still present (those that were subaudible or above audible before are now shifted into audible range as others are shifted out).<BR>
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Am I right in these? Just trying to place myself and help anyone else, not to mention spark some interesting conversation.<BR>
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-eric</FONT></HTML>