[Numpy-discussion] Q: Use of scipy.signal.bilinear

[Charles R Harris]

On Tue, Dec 8, 2015 at 9:30 AM, R Schumacher <rays at blue-cove.com> wrote:

> We have a function which describes a frequency response correction to
> piezo devices we use. To flatten the FFT, it is similar to:
> Cdis_t = .5
> N = 8192
> for n in range(8192):
>   B3 = n * 2560 / N
>   Fc(n) = 1 / ((B3/((1/(Cdis_t*2*pi))**2+B3**2)**0.5)*(-0.01*log(B3) +
> 1.04145))
>
> In practice it really only matters for low frequencies.
>
> I suggested that we might be able to do a time domain correction as a
> forward-reverse FFT filter using the function, but another said it can also
> be applied in the time domain using a bilinear transform.
> So, can one use
>
> http://docs.scipy.org/doc/scipy-0.16.0/reference/generated/scipy.signal.bilinear.html
> and, how does one generate b,a from the given Fourrier domain flattening
> function?
>

This should go to either scipy-user at scipy.org or scipy-dev at scipy.org

Chuck
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