[music-dsp] creating an IIR filter from an impulse response...

[Bram - Smartelectronix]

Richard Dobson wrote:
 >
> Inevitably, the answer has to be "it depends". If your impulse response is a 
> finite sequence of values,as any practical sampled response has to be, then by 
> definition it is finite, and hence cannot be generated by a recursive filter, 
> which by definition generates an ~infinite~ impulse response.

Hmm, I've read a paper that uses finite versions of IIR's to make 
gated-sounding reverbs...

Isn't

         1 - a^N * z^(-N)
H(z) = ------------------
           1 - a*z^(-1)

finite?


And, couldn't this be generalised?



  - bram

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