Thank you very much to all of you for the great resources and the blazingly
fast answers. It gives me much to digest. Indeed, my question was simply about
a feedback path, no feedforward.
I solved my problem, using Peter’s comment and with the great help of Matt
(offline), simply by doing:
F = Fa ^ D
where Fa is an « amount » of feedback (I didn’t need real units). I guess I
didn’t really think about it in terms of a geometrical suite.
Thanks again,
-m
> Le 10 mai 2015 à 23:41, Peter S <peter.schoffhau...@gmail.com> a écrit :
>
> On 11/05/2015, Peter S <peter.schoffhau...@gmail.com> wrote:
>> By the way,
>> the 'decay time' is also well defined in case of one-pole filters, and
>> is called 'time constant'
>
> dspguide.com gives the following time constant formula for one pole filters:
>
> x = exp ( -1 / d )
>
> where d is the desired decay time (to ~36.8%) in samples, and x is the
> feedback coefficient.
>
> See equation 19-4 at:
> http://www.dspguide.com/ch19/2.htm
>
> - Peter
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