Convolution and IR, what could it be?

Duh, on my part. I usually see FIR-Finite Impulse Response 
and IIR-Infinite Impulse Response,.... a just plain Impulse
Respone never occurred to me. Duh.... on my part, should've
caught that one, especially since I'd been reading up and 
reviewing convolutions lately.

Thanks, cheers,
-Partev


==========================================================



--- noisesmith@gmail.com wrote:

From: Justin Glenn Smith 
To: csound@lists.bath.ac.uk
Subject: Re: [Csnd] Convolution with changing IR
Date: Thu, 24 Mar 2011 22:17:24 -0700

Impulse response. Literally, the output of the system when the input is a single impulse.

Partev Barr Sarkissian wrote:
> Forgive my moment of cluelessness but, what is "IR" in this context?
> 
> -pbs
> 
> 
> ====================================================================
> 
> 
> 
> --- alexweiss86@gmail.com wrote:
> 
> From: Alex Weiss 
> To: csound@lists.bath.ac.uk
> Subject: [Csnd] Convolution with changing IR
> Date: Thu, 24 Mar 2011 11:44:06 -0700
> 
> Hi folks,
> 
> I've been a quiet reader of this list for a while, but I do have a
> question now that I cannot solve on my own. Most of my sound design
> and music involves heavy use of convolution (pconvolve), as it's one
> of the most powerful techniques out there, I believe. But there is
> one limiting factor: while I can change and modulate the sound to be
> convoluted to my liking, the IR is always static in that I can't
> change it. What I'd love to do is to find a way to have the IR change
> continuously (but slowly) over time. I assume one way to do this
> would be to generate and output a new IR wave file at k-rate before
> calls  to  pconvolve.  But  that  seems prohibitive in terms of
> performance overhead. Additionally, I don't even know if it would
> work at all, as the entire sound file would have to be generated
> during a single k-cycle, which means that I'd have to find a way to
> split one cycle up into multiple "subcycles." I'm probably not very
> clear on this, but I hope you understand what I mean.
> 
> How hard would it be to modify the pconvolve opcode to read the IR
> from a table instead of a file? I believe this might be a solution...
> 
> Thanks,
> 
> Alex
> 
> 
> 
> 
> _____________________________________________________________
> Netscape.  Just the Net You Need.
> 
> 
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
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> 
> 



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_____________________________________________________________
Netscape.  Just the Net You Need.


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Yes, it is implicitly FIR when you say IR in connection with convolution,
as the result of an IIR convolution would take (literally) forever to compute...
Oeyvind


2011/3/25 Partev Barr Sarkissian :
> Convolution and IR, what could it be?
>
> Duh, on my part. I usually see FIR-Finite Impulse Response
> and IIR-Infinite Impulse Response,.... a just plain Impulse
> Respone never occurred to me. Duh.... on my part, should've
> caught that one, especially since I'd been reading up and
> reviewing convolutions lately.
>
> Thanks, cheers,
> -Partev
>
>
> ==========================================================
>
>
>
> --- noisesmith@gmail.com wrote:
>
> From: Justin Glenn Smith 
> To: csound@lists.bath.ac.uk
> Subject: Re: [Csnd] Convolution with changing IR
> Date: Thu, 24 Mar 2011 22:17:24 -0700
>
> Impulse response. Literally, the output of the system when the input is a single impulse.
>
> Partev Barr Sarkissian wrote:
>> Forgive my moment of cluelessness but, what is "IR" in this context?
>>
>> -pbs
>>
>>
>> ====================================================================
>>
>>
>>
>> --- alexweiss86@gmail.com wrote:
>>
>> From: Alex Weiss 
>> To: csound@lists.bath.ac.uk
>> Subject: [Csnd] Convolution with changing IR
>> Date: Thu, 24 Mar 2011 11:44:06 -0700
>>
>> Hi folks,
>>
>> I've been a quiet reader of this list for a while, but I do have a
>> question now that I cannot solve on my own. Most of my sound design
>> and music involves heavy use of convolution (pconvolve), as it's one
>> of the most powerful techniques out there, I believe. But there is
>> one limiting factor: while I can change and modulate the sound to be
>> convoluted to my liking, the IR is always static in that I can't
>> change it. What I'd love to do is to find a way to have the IR change
>> continuously (but slowly) over time. I assume one way to do this
>> would be to generate and output a new IR wave file at k-rate before
>> calls  to  pconvolve.  But  that  seems prohibitive in terms of
>> performance overhead. Additionally, I don't even know if it would
>> work at all, as the entire sound file would have to be generated
>> during a single k-cycle, which means that I'd have to find a way to
>> split one cycle up into multiple "subcycles." I'm probably not very
>> clear on this, but I hope you understand what I mean.
>>
>> How hard would it be to modify the pconvolve opcode to read the IR
>> from a table instead of a file? I believe this might be a solution...
>>
>> Thanks,
>>
>> Alex
>>
>>
>>
>>
>> _____________________________________________________________
>> Netscape.  Just the Net You Need.
>>
>>
>> Send bugs reports to the Sourceforge bug tracker
>>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
>> Discussions of bugs and features can be posted here
>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>>
>>
>
>
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>
>
>
>
>
> _____________________________________________________________
> Netscape.  Just the Net You Need.
>
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>
>


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