Yes please, do that. My feeling is that there 'has' to be a pi in there
somewhere,
Errors in H&H aren't unknown...
I dislike SIN(X)/X calculations, they always involve PIs in strange places and
never seem to plot out properly without some juggling of constants.
Andy G4JNT
-----Original Message-----
From: James Moritz [SMTP:[email protected]]
Sent: 2003/12/12 11:17
To: [email protected]
Subject: RE: LF: Related Technical Query - Soundcard calibrator
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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