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RE: LF: Related Technical Query - Soundcard calibrator

To: [email protected]
Subject: RE: LF: Related Technical Query - Soundcard calibrator
From: "James Moritz" <[email protected]>
Date: Fri, 12 Dec 2003 11:17:28 -0000
Importance: Normal
In-reply-to: <001901c3c00d$5c321600$045bfea9@RSGB613192>
Organization: University of Hertfordshire
Reply-to: [email protected]
Sender: <[email protected]>
Dear Andy, LF Group

I hate to throw a spanner in the works, but... A noise source of exactly
this type is discussed in Horowitz & Hill "The Art of Electronics" 2nd
ed., section 9.34. This gives the formula (in the form Andy has used)
Vrms^2 = Vpk^2 * 2 * BW /Fclock, (giving 224mV rms) which is different
by a factor of sqrt(pi) from the value Andy gets. I spent some time last
night trying to figure out which one is correct, and came out with a
reasonably convincing case for Horowitz & Hill's formula - if anyone is
interested, I will put it into an e-mail compatible form


Cheers, Jim Moritz
73 de M0BMU



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