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From: Mikolaj on 25 May 2010 15:16
On 22-05-2010 at 23:22:20 HardySpicer <gyansorova(a)gmail.com> wrote:


> Of course we know that but there are at least two other methods we can
> use, forward and backward difference and one of these is also
> guaranteed stable.

These are in fact mathematical methods for "aproximation"
of a group of differential equations.
This is not Z-transform.
And they are completely something else
from looking for equivalent with some criteria
for example step invariance or freq. response mapping.

> There is an argument to say that if I create an FIR filter with linear
> phase in digital then it has no counterpart in analogue, but that is
> working backwards!

You will never get equivalent.



--
Mikolaj
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