In an attempt to make my calculations a little clearer and more useful, I m=
ade some changes to the spreadsheet.
There is now a "Noise Difference" calculation that displays the difference =
between the Total Noise and the Mic Noise. Ideally this should be less than=
about 0.8 dB.
I also added calculations so that if one knows any two of the parameters on=
e can calculate the third.
1) EIN (dBu)
2) Self Noise (dB SPL)
3) Sensitivity (mV/Pa)
http://ow.ly/geuWY
I never thought I'd be the one doing this! I am not a math person by traini=
ng, so use at your own risk. That said, I have found this spreadsheet reall=
y useful, and my listening tests have confirmed the validity of the numbers=
.
Cheers!
John C.
--- In "John Crockett" <> wrote:
>
> I have also been doing this in Excel. I just posted a small (36KB) spread=
sheet (calculations.xls) online that does two things:
>
> Calculate microphone EIN (dBu) from any combination of self noise and sen=
sitivity.
>
> Calculate total noise for any two combined sources (e.g. microphone + pre=
amp).
>
> I have many other formulas for converting dB to mV/Pa and converting betw=
een dBV and dBu for example, but these are the two I have been using a lot =
to educate myself about how these parameters interact.
>
> Download at
>
> http://ow.ly/geuWY
>
> I hope it's useful and saves someone else the trouble!
>
> John
> John Crockett
> Westminster, Vermont
>
> --- In Paul Jacobson <pj@> wrote:
> >
> > Klas,
> >
> > The information to do so is out there, on Raimund's site for example.
> >
>
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