On 02-Dec-11 00:42, Michael Heth wrote:
> Although I have an Ipod and a mic the one thing that has always been
> troubling to me with the idea of a "freebie" method of sonic tuning is
> the problem of calibration of the instrument. The chance that a mic
> made for $1 is spot on the money is pretty slim. I was in the audio
> business for quite a while and I can tell you that even in *high
> quality* mass market products you are lucky to get a 10% tolerance. So
> if you were aiming for 110 hz you could be anywhere from 100-120hz.
> What tolerance they get on the built in mic is another question.
The quality of the mic has NO effect whatsoever on the frequency, only
the amplitude!
The actual amplitude is irrelevant.
And the clock in the Ipod or any other such device is accurate to a
fraction of a percent (typically better than 0.01%), so the frequency
measured by any such device is better than 0.01 Hz.
Tom
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