using convolution in Real-time

using convolution in Real-time

Date	2015-09-23 21:00
From	Anton Kholomiov
Subject	using convolution in Real-time
Attachments	None None
	I've read that you can imitate any filter (even analog one) knowing impulse response. It is fantastic! But alas convolution produces delay that is proportional to the duration of impulse response sample. It becomes unusable for real time. Is there some hack to solve this problem? Also how the plugins imitate reverbs from famous places in real time? They are using convolution I guess but the should be held back by noticeable delay time Cheers, Anton

Date	2015-09-23 22:03
From	Rory Walsh
Subject	Re: using convolution in Real-time
Attachments	None None
	Iain McCurdy has some real-time convolutions on his site. Have you tried them out? On 23 September 2015 at 21:00, Anton Kholomiov <anton.kholomiov@gmail.com> wrote: I've read that you can imitate any filter (even analog one) knowing impulse response. It is fantastic! But alas convolution produces delay that is proportional to the duration of impulse response sample. It becomes unusable for real time. Is there some hack to solve this problem? Also how the plugins imitate reverbs from famous places in real time? They are using convolution I guess but the should be held back by noticeable delay time Cheers, Anton ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Csound-users mailing list Csound-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/csound-users Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Date	2015-09-24 06:55
From	Anders Genell
Subject	Re: using convolution in Real-time
Attachments	None None
	Victor Lazzarini mentioned some time back the possibility to perform partitioned convolution in csound. It basically works by dividing the IR into smaller pieces an applying the in parallel. It should allow for some reduction of latency (but will probably cost in cpu load). I don't know the details, but maybe Victor can chime in? Regards, Anders 23 sep 2015 kl. 23:03 skrev Rory Walsh <rorywalsh@ear.ie>: Iain McCurdy has some real-time convolutions on his site. Have you tried them out? On 23 September 2015 at 21:00, Anton Kholomiov <anton.kholomiov@gmail.com> wrote: I've read that you can imitate any filter (even analog one) knowing impulse response. It is fantastic! But alas convolution produces delay that is proportional to the duration of impulse response sample. It becomes unusable for real time. Is there some hack to solve this problem? Also how the plugins imitate reverbs from famous places in real time? They are using convolution I guess but the should be held back by noticeable delay time Cheers, Anton ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Csound-users mailing list Csound-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/csound-users Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Csound-users mailing list Csound-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/csound-users Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Date	2015-09-24 07:04
From	Gleb Rogozinsky
Subject	Re: using convolution in Real-time
Attachments	None None
	There always be some latency in that kind of processing. Anyway, you may segment IR as was mentioned before or also try using FFT convolution instead of direct one. It should be faster, since in spectral domain it turns into multiplication. 23.09.2015 23:01 пользователь "Anton Kholomiov" <anton.kholomiov@gmail.com> написал: I've read that you can imitate any filter (even analog one) knowing impulse response. It is fantastic! But alas convolution produces delay that is proportional to the duration of impulse response sample. It becomes unusable for real time. Is there some hack to solve this problem? Also how the plugins imitate reverbs from famous places in real time? They are using convolution I guess but the should be held back by noticeable delay time Cheers, Anton ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Csound-users mailing list Csound-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/csound-users Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Date	2015-09-24 07:58
From	Oeyvind Brandtsegg
Subject	Re: using convolution in Real-time
	pconvolve andd ftconv does this (partitioning the IR and convolving in the spectrral domain). It works very well, and is not really that taxing on the CPU. The latency will be relative to partitioin size, so not really zero latency, but quite low (in the order of 20-40 ms). For many reverb applications, you could live with that latency and in many cases it will be similar to the natural pre-delay of the acoustics you want to simulate. For true zero latency, one would use direct convolution for the very first part (= partitionsize) off the IR, then crossfade over to partitioned spectral convolution. 2015-09-24 8:04 GMT+02:00 Gleb Rogozinsky : > There always be some latency in that kind of processing. Anyway, you may > segment IR as was mentioned before or also try using FFT convolution instead > of direct one. It should be faster, since in spectral domain it turns into > multiplication. > > 23.09.2015 23:01 пользователь "Anton Kholomiov" > написал: >> >> I've read that you can imitate any filter (even analog one) >> knowing impulse response. It is fantastic! >> But alas convolution produces delay that is proportional to the duration >> of impulse response sample. It becomes unusable for >> real time. Is there some hack to solve this problem? >> >> Also how the plugins imitate reverbs from famous >> places in real time? They are using convolution I guess >> but the should be held back by noticeable delay time >> >> Cheers, >> Anton >> >> >> ------------------------------------------------------------------------------ >> Monitor Your Dynamic Infrastructure at Any Scale With Datadog! >> Get real-time metrics from all of your servers, apps and tools >> in one place. >> SourceForge users - Click here to start your Free Trial of Datadog now! >> http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 >> _______________________________________________ >> Csound-users mailing list >> Csound-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/csound-users >> Send bugs reports to >> https://github.com/csound/csound/issues >> Discussions of bugs and features can be posted here >> > > ------------------------------------------------------------------------------ > Monitor Your Dynamic Infrastructure at Any Scale With Datadog! > Get real-time metrics from all of your servers, apps and tools > in one place. > SourceForge users - Click here to start your Free Trial of Datadog now! > http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 > _______________________________________________ > Csound-users mailing list > Csound-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/csound-users > Send bugs reports to > https://github.com/csound/csound/issues > Discussions of bugs and features can be posted here > -- Oeyvind Brandtsegg Professor of Music Technology NTNU 7491 Trondheim Norway Cell: +47 92 203 205 http://flyndresang.no/ http://www.partikkelaudio.com/ http://soundcloud.com/brandtsegg http://soundcloud.com/t-emp ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Csound-users mailing list Csound-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/csound-users Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Date	2015-09-24 09:03
From	Victor Lazzarini
Subject	Re: using convolution in Real-time
	Here’s a UDO for zero-latency partitioned convolution /************************************************ asig ZConv ain,ipart,irat,inp,ifn ain - input signal ipart - first partition size in samples irat - partition growth ratio inp - total number of partition sizes ifn - function table number containing the IR ***********************************************/ opcode ZConv,a,aiiiio asig,iprt,irat,inp,ifn,icnt xin if icnt < inp-1 then acn ZConv asig,iprt,irat,inp,ifn,icnt+1 endif if icnt == 0 then a1 dconv asig,iprt,ifn elseif icnt < inp-1 then ipt = iprtirat^(icnt-1) isiz = ipt(irat-1) print ipt print isiz a1 ftconv asig,ifn,ipt,ipt,isiz else ipt = iprtirat^(icnt-1) a1 ftconv asig,ifn,ipt,ipt endif xout a1 + acn endop ……. a1 ZConv asig,64,4,6,1 ======================== Dr Victor Lazzarini Dean of Arts, Celtic Studies and Philosophy, Maynooth University, Maynooth, Co Kildare, Ireland Tel: 00 353 7086936 Fax: 00 353 1 7086952 > On 24 Sep 2015, at 06:55, Anders Genell wrote: > > Victor Lazzarini mentioned some time back the possibility to perform partitioned convolution in csound. It basically works by dividing the IR into smaller pieces an applying the in parallel. It should allow for some reduction of latency (but will probably cost in cpu load). > > I don't know the details, but maybe Victor can chime in? > > Regards, > Anders > > > > 23 sep 2015 kl. 23:03 skrev Rory Walsh : > >> Iain McCurdy has some real-time convolutions on his site. Have you tried them out? >> >> On 23 September 2015 at 21:00, Anton Kholomiov wrote: >> I've read that you can imitate any filter (even analog one) >> knowing impulse response. It is fantastic! >> But alas convolution produces delay that is proportional to the duration >> of impulse response sample. It becomes unusable for >> real time. Is there some hack to solve this problem? >> >> Also how the plugins imitate reverbs from famous >> places in real time? They are using convolution I guess >> but the should be held back by noticeable delay time >> >> Cheers, >> Anton >> >> ------------------------------------------------------------------------------ >> Monitor Your Dynamic Infrastructure at Any Scale With Datadog! >> Get real-time metrics from all of your servers, apps and tools >> in one place. >> SourceForge users - Click here to start your Free Trial of Datadog now! >> http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 >> _______________________________________________ >> Csound-users mailing list >> Csound-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/csound-users >> Send bugs reports to >> https://github.com/csound/csound/issues >> Discussions of bugs and features can be posted here >> >> >> ------------------------------------------------------------------------------ >> Monitor Your Dynamic Infrastructure at Any Scale With Datadog! >> Get real-time metrics from all of your servers, apps and tools >> in one place. >> SourceForge users - Click here to start your Free Trial of Datadog now! >> http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 >> _______________________________________________ >> Csound-users mailing list >> Csound-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/csound-users >> Send bugs reports to >> https://github.com/csound/csound/issues >> Discussions of bugs and features can be posted here > ------------------------------------------------------------------------------ > Monitor Your Dynamic Infrastructure at Any Scale With Datadog! > Get real-time metrics from all of your servers, apps and tools > in one place. > SourceForge users - Click here to start your Free Trial of Datadog now! > http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140_______________________________________________ > Csound-users mailing list > Csound-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/csound-users > Send bugs reports to > https://github.com/csound/csound/issues > Discussions of bugs and features can be posted here ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Csound-users mailing list Csound-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/csound-users Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here