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4. Re: speaking of fetch

Subject: 4. Re: speaking of fetch
From: "Keith Smith" smith9e499
Date: Fri Mar 15, 2013 1:34 pm ((PDT))
er, let's make that ".... similar to the straight line portions of D/logE
curves..."


On Fri, Mar 15, 2013 at 2:32 PM, Keith Smith <> wrote:

> 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 2.2mV @ 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,
>> but 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 leas=
t
>> of our worries.
>>
>> -Dan
>>
>>
>>
>
>
>
> --
> Keith Smith
>
> Keith Smith Trio, Northern Lights =96 Altai Khangai - www.keithsmith.ca
> Photography - www.mymountains.ca
>



--
Keith Smith

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









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