Klarinet Archive - Posting 000312.txt from 1997/03

From: Adam Calabrese <adam.calabrese@-----.gov>
Subj: Re: Hard/Close (was Re: Breathing on the clarinet)
Date: Mon, 10 Mar 1997 11:24:07 -0500

At 03:45 PM 3/10/97 +0000, JE Kirkwood <jek100@-----.UK> wrote:
>What's 'white noise'?

Acoustical noise of which the intensity is the same at all frequencies
within a given band. Intensity spectrum is flat.

Basically sounds like an upleasant hiss.

Technical notes....

Related is pink noise, which has equal *power* in equal fractions of an
octave (the spectrum decreases by -3dB per octave). Pink noise has a
"hushing" sound. Pink noise is used to test for things like sound
insulation between rooms.

Mark Charette asked what the term for shaped noise was. I don't remember,
but maybe his idea has something to do with the use of hanning (hamming?)
windows in spectrum analysis....

Later,

-Adam

-Adam Calabrese
National Institute of Standards and Technology
Gaithersburg, MD 20899