I don't know the details, but I now that useful impulse responses can be made by recording by recording the response to sweeping a loudish sine tone from lowest audible to highest audible frequency in the space. How that is processed to create an impulse I don't know, probably simply by doing a Fourier analysis of the entire recording. After all, the notional "impulse" is a Dirac delta, a signal of zero duration and infinite amplitude thus containing all frequencies at equal amplitude, and the sine sweep obviously contains all frequencies of interest at equal amplitude.

Another method of deriving the impulse response would be to record the response of the space to a maximum length sequence, a type of noise containing every sample that can be expressed in the word length. The impulse response can be computed from the recorded response by taking its circular cross-correlation with the original sequence. I don't know if anyone actually does this... the MLS for a CD quality recording would be about 24 seconds long.

Regards,
Mike

-----Original Message-----
>From: Anthony Palomba 
>Sent: Mar 31, 2008 10:58 AM
>To: csound@lists.bath.ac.uk
>Subject: [Csnd] Re: Re: Re: Re: Re: Top Quality Reverb
>
>Wow that is pretty cool. I am curious to know how 
>I would make my own impulses. Are they just processed
>field recordings of an isolated sound within that space?
>
>
>
>Anthony
>
>  ----- Original Message ----- 
>  From: peiman khosravi 
>  To: csound@lists.bath.ac.uk 
>  Sent: Monday, March 31, 2008 7:28 AM
>  Subject: [Csnd] Re: Re: Re: Re: Top Quality Reverb
>
>
>  http://www.xs4all.nl/~fokkie/IR.htm
>
>
>  On 31 Mar 2008, at 14:24, Panos Katergiathis wrote:
>
>    I was about to ask that myself...
>
>
>    Anthony Palomba wrote:
>      Where can I get interesting impulse responses of different spaces?
>      Anthony
>
>
>
>
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