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Re: Noise Calculations

Subject: Re: Noise Calculations
From: "Keith Smith" smith9e499
Date: Mon Jun 2, 2014 1:52 pm ((PDT))
Hi John,
Thanks for this!!!
BTW - right click and 'save link as...'
Piece of cake :)


On Mon, Jun 2, 2014 at 7:02 AM, 'John Crockett' 
[naturerecordists] <> wrote:

> For those new to the list, I have created an Excel spreadsheet that
> calculates the Total Noise for any combination of microphone and preamp,
> when you know the noise figures for both. This helps in choosing a
> recorder preamp to use with a particular microphone.
> Here is the link:
> The default values in the spreadsheet represent the Rode NT4 stereo
> microphone (output noise -114 dBuA) and the Olympus LS-11 recorder (EIN
> -122 dBuA). The result shows the Noise Difference between the Microphone
> and the Total Noise is less than 0.8 dB and therefore a good match.
> The spreadsheet also calculates the microphone output noise in dBu when
> you know the self noise in dB SPL and the sensitivity in mV/Pa. Again the
> NT4 is the default example (self noise = 16 dB SPL and sensitivity = 12
> mV/Pa).
> Because some microphone manufacturers give sensitivity in dBV/Pa instead
> of mV/Pa I have also included a conversion between dBV (re 1.0V) and mV
> and dBu.
> I don't know how this works on other devices, but on my computer the link
> does not immediately download the spreadsheet. It displays a page in HTML
> that shows the content of the spreadsheet, but is not a form that allows
> calculations to be entered. To do the calculations you need to click the
> download button in the upper right corner and of course you have to be
> able to work with Excel files.
> I hope this is useful to others. I use it a lot.
> For those list veterans who remember, I posted a similar spreadsheet about
> a year ago, but I have added the dBV conversion calculations and I have
> changed the location of the file.
> best wishes,
> John
> John Crockett
> Let us live in harmony with Earth
> And all creatures
> That our lives may be a blessing.

Keith Smith - KeithSmith.ca_Freelance Guitarist & Location Recording Service

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