From: Ross Vandegrift (ross_at_willow.seitz.com)
Date: 11/25/03 00:07 EST
From: Ross Vandegrift <ross@willow.seitz.com> Subject: Re: [Ardour-users] Re: good quality reverb - brutefir! Message-ID: <20031125050716.GA10500@willow.seitz.com> Date: Tue, 25 Nov 2003 00:07:16 -0500 On Sun, Nov 23, 2003 at 01:36:54PM +0100, Piotr Sawicki wrote: > BruteFIR is very interesting, but its documentation is not sufficient to > know how to > convolve filters that use impulse responses. I spoke last week to my EE friend and he explained this to me. It's staggeringly easy. To apply any filter to any arbitrary signal, aparantly, all you need to do is take a signal with the filter already applied, and convolve it with your target signal. He assured me it really is that simple - hopefully he wasn't oversimplifying it. Properties of the original signal can aparantly make this better - a delta function makes the best signal to convolve your dry signal with. Unfortuantely, producing a delta function is just a touch impossible in the real world. So while I don't know the particulars of how this applies to audio, the theory seems to indicate it'd be pretty simple. > >The biggest problem being the lack of impulses. If there where a library > >of free impulses I could easily envision bruteFIR becoming a > >"killer-application". I also began thinking about this after the discussion. If things stay about as simple as my EE friend says they are, then we could perhaps produce some audio files that are "close enough" to a delta function to give good results. People could then play them back in a room they liked and record with a laptop or something. Bada-bing - instant impulses. I'm not sure what kinda of signals people are using for producing these impulses - I'm guessing it's something really short and frickin' loud... -- Ross Vandegrift ross@willow.seitz.com A Pope has a Water Cannon. It is a Water Cannon. He fires Holy-Water from it. It is a Holy-Water Cannon. He Blesses it. It is a Holy Holy-Water Cannon. He Blesses the Hell out of it. It is a Wholly Holy Holy-Water Cannon. He has it pierced. It is a Holey Wholly Holy Holy-Water Cannon. He makes it official. It is a Canon Holey Wholly Holy Holy-Water Cannon. Batman and Robin arrive. He shoots them. ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Ardour-users mailing list Ardour-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ardour-users
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