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Re: HC selectivity ... was Re: Physiological models of cochlea activity - alternatives to the travelling wave
Bob and Matt -
The difference between your two values for the cut off frequency
appears to be the 2pi factor. From
wc = 1/(RC) rad/s
fc = 1/(2piRC) Hz
Thus wc = 25000 rad/s (not 25 kHz, as Matt suggested!)
Bob's calculation of fc = ~4kHz is correct.
> Date: Fri, 28 Sep 2007 08:24:35 -0400
> From: Bob Masta <audio@xxxxxxxxxxx>
> Subject: Re: HC selectivity ... was Re: Physiological models of cochlea activity - alternatives to the travelling wave
> On 28 Sep 2007 at 12:55, Matt Flax wrote:
> > With respect to a hair cell at rest ... take the following general
> > values for membrane resistance and capacitance :
> > R= 40 Meg Ohms ... taken from  for example
> > C= 1 pF ... taken from  for example
> > The first order cut-off frequency would be about 25 kHz.
> > fc=25 kHz.
> How do you obtain this 25 kHz value? Using
> f = 1 / (2 * pi * R * C)
> I come up with about 4 kHz.
> Best regards,
> Bob Masta