Indeed, if you have access to the coefficients, that is the proper way to do it. My suggestion was for the situations where you don't (or where getting a set of coefficients from the source code is something of a task in itself).

Richard Dobson

On 17/01/2017 17:30, Evan Balster wrote:
I must disagree.  The cleanest way to compute the transfer function
<https://en.wikipedia.org/wiki/Digital_filter#Characterization>, is to
/compute the transfer function/, directly — you'll get an exact answer,
with minimal computational expense.


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