Re: [music-dsp] filter smoothly changeable from LP-BP-HP?
Hi Bram, A Generalization of the Biquadratic Parametric Equalizer Christensen, Knud Bank AES 115 (October 2003) https://secure.aes.org/forum/pubs/conventions/?elib=12429 Defines equations with a symmetry parameter for smoothly moving between the states you mention. There are graphs so you can check it out. The paper is excellent. There is a related patent. I haven't looked at the patent so I can't comment on that. Another approach might be to crossfade between the taps of an SVF. I'm not sure if that would work. Ross On 10/02/2013 10:23 PM, Bram de Jong wrote: Hello everyone, does anyone know of a filter design that can smoothly be changed from LP to BP to HP with a parameter? IIRC LP/AP/HP could be done simply by perfect reconstruction LP/HP filter pairs, but never seen something similar for BP in the middle... The filter doesn't need to be perfect, it's for something musical/creative rather than a purely scientific goal... Any help very welcome! :-) - Bram -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp
Re: [music-dsp] filter smoothly changeable from LP-BP-HP?
On 2/10/13 7:37 AM, Ross Bencina wrote: A Generalization of the Biquadratic Parametric Equalizer Christensen, Knud Bank AES 115 (October 2003) https://secure.aes.org/forum/pubs/conventions/?elib=12429 maybe i shouldn't say this, but someone here likely has a pdf copy of the paper in case it breaks your bank to buy it from AES. -- r b-j r...@audioimagination.com Imagination is more important than knowledge. -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp
Re: [music-dsp] filter smoothly changeable from LP-BP-HP?
On 11/02/2013 1:37 AM, robert bristow-johnson wrote: maybe i shouldn't say this, but someone here likely has a pdf copy of the paper in case it breaks your bank to buy it from AES. Unfortunately not me. I lost the pdf in a data loss incident and only have a printout and don't have an AES digital library sub at the moment. But this does raise an issue that I've been thinking about for a while: Does anyone know whether the AES has any intentions of moving to open access for their publication archive? It seems overdue. Ross. -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp
Re: [music-dsp] filter smoothly changeable from LP-BP-HP?
Well, a PDF would definitely be useful if anyone has it... :-) Dave thanks for the code! greetings, - bram On Sun, Feb 10, 2013 at 3:54 PM, Ross Bencina rossb-li...@audiomulch.com wrote: On 11/02/2013 1:37 AM, robert bristow-johnson wrote: maybe i shouldn't say this, but someone here likely has a pdf copy of the paper in case it breaks your bank to buy it from AES. Unfortunately not me. I lost the pdf in a data loss incident and only have a printout and don't have an AES digital library sub at the moment. But this does raise an issue that I've been thinking about for a while: Does anyone know whether the AES has any intentions of moving to open access for their publication archive? It seems overdue. Ross. -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp -- http://www.samplesumo.com http://www.freesound.org http://www.smartelectronix.com http://www.musicdsp.org office: +32 (0) 9 335 59 25 mobile: +32 (0) 484 154 730 -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp
Re: [music-dsp] filter smoothly changeable from LP-BP-HP?
On Sun, 10 Feb 2013 03:23:54 -0800 Bram de Jong bram.dej...@gmail.com wrote: Hello everyone, does anyone know of a filter design that can smoothly be changed from LP to BP to HP with a parameter? IIRC LP/AP/HP could be done simply by perfect reconstruction LP/HP filter pairs, but never seen something similar for BP in the middle... The filter doesn't need to be perfect, it's for something musical/creative rather than a purely scientific goal... This may sound naive, but would it not be possible to chain an LP and a HP filter in series and adjust their dry/wet rates according to parameter? -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp
