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 <> wrote:
>>
>>> In an attempt to make my calculations a little clearer and more useful,=
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 inpu=
t noise" of the preamp. Therefore it should not be used for the noise contr=
ibuted by the microphone. I don't think there's a standard term for the out=
put level of the mic's self-noise, ordinarily quoted in terms of equivalent=
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 impeda=
nce of the preamp on the output impedance of the mic. Either or both may no=
t be flat in the frequency domain. Let's not go there for now!
>>
>> -Dan
>>
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