Answering my own question. I found this on the Rane website
http://www.rane.com/par-e.html
"EIN (equivalent input noise) Output noise of a system or device referred t=
o the input. Done by modeling the object as a noise-free device with an inp=
ut noise generator equal to the output noise divided by the system or devic=
e gain."
I think I understand that, sort of. For the sake of clarity I changed my sp=
readsheet labels to "Output Noise."
John
--- In "John Crockett" <> wrote:
>
> What is the "Equivalent Input Noise" equivalent to?
>
> JC
>
> --- In Dan Dugan <dan@> wrote:
> >
> > It isn't equivalent to anything, it's just the mic output noise!
> >
> > -Dan
> >
> > On Dec 20, 2012, at 9:23 AM, John Crockett wrote:
> >
> > > Would "Equivalent Output Noise" or EON do the trick?
> > >
> > > John
> > >
> > > --- In Dan Dugan <dan@> wrote:
> > >>
> > >>> In an attempt to make my calculations a little clearer and more use=
ful, I made some changes to the spreadsheet.
> > >>
> > >> This is very useful, John, thank you.
> > >>
> > >> I quibble with the use of one term. "EIN" refers to the "equivalent =
input noise" of the preamp. Therefore it should not be used for the noise c=
ontributed by the microphone. I don't think there's a standard term for the=
output level of the mic's self-noise, ordinarily quoted in terms of equiva=
lent SPL. It's a useful figure, though, and perhaps we should invent a term=
for it. Self-noise output?
> > >>
> > >> Missing from your calculations is the loading effect of the input im=
pedance of the preamp on the output impedance of the mic. Either or both ma=
y not be flat in the frequency domain. Let's not go there for now!
> > >>
> > >> -Dan
> > >>
> > >
> > >
> > >
> > >
> > > ------------------------------------
> > >
> > > "While a picture is worth a thousand words, a
> > > sound is worth a thousand pictures." R. Murray Schafer via Bernie Kra=
use.
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> >
>
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