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3. Re: speaking of fetch

Subject: 3. Re: speaking of fetch
From: "Keith Smith" smith9e499
Date: Fri Mar 15, 2013 1:32 pm ((PDT))
Hi Dan,
I don't want to get hung up on the linearity -wish I hadn't mentioned it. ;=
)
But lines can have different slopes and still be lines, right?
If 2 mics, (different makers) produce 22mV/Pa at 94db, do they both produce
Message: 2.
Subject: 2mV @ 74dB (or some other voltage (equally) if my math is wrong)? I 
don't
see why they should.
I'm expecting different designs to have different (linear) i/o ratios,
similar to D/logE curves in photography.
k


On Fri, Mar 15, 2013 at 12:14 PM, Dan Dugan <> wrote:

> **
>
>
> > I'm curious to learn whether the concept of fetch might have something =
to
> > do with the steepness of the transfer function of a given microphone.
> Yes,
> > typically we only get one number for that at a 94 dBSPL test figure, bu=
t
> it
> > doesn't follow that the mV/Pa is a linear function over varying
> pressures, *
> > or* that the slopes of I/O for any 2 microphones with the same 94dB
>
> > sensitivity figure are the same.
>
> I think if mics weren't linear, that would be obvious as distortion.
> Linearity is, I believe, pretty easy to obtain in a microphone. The least
> of our worries.
>
> -Dan
>
>
>



--
Keith Smith

Keith Smith Trio, Northern Lights =96 Altai Khangai - www.keithsmith.ca
Photography - www.mymountains.ca









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