Re: [LAU] jack/oversampling

On 03/16/2014 05:45 PM, tim wrote: ok, so you are trying to do weird synthesis that can produce non-bandlimited output? i can see how you might want to use high sampling rates there, but then again there will always be another processing step that causes yet higher harmonics - addressing that with high sample rates seems like a somewhat blunt approach that is bound to fail eventually. that statement is definitely not correct. granted, if you only do delays with sample granularity (which has the big advantage of not requiring any computation), there is some benefit in using higher rates. but you can produce sub-sample delays with arbitrary precision easily. for IIR feedback, i sure see the point, but then the question becomes "why do you need to expose this to the outside world?" - just upsample in your processing application and leave the rest of the jack graph running at a sane rate. i don't understand this. can you elaborate? what is "blt"? true. it's a funny and somewhat strange thought exercise for me to try and achieve the highest possible "fidelity" with brutal distortion algorithms - obviously, since i don't work with distortion, i try to keep my signal chains as linear as possible. but i can see how somebody well trained in distortion synthesis would want to eliminate aliasing artefacts, since those would conceivably interfere with systematic exploration of sounds based on prior experience, and make the sonic outcome even more erratic than it already is... but in any case, there is no point in taking the internal higher sampling rates out into the real world, so the zita resampling approach might be your best bet. incidentally, just returned from musikmesse, and i've had my share of DXD/DSD loonies... if you want to go there, there is people who want to sell you 256-times oversampled single-bit delta sigma gear, and they will happily talk megahertz with you. it would be a ton of fun to discuss with them the best way to handle a tanh waveshaper, and what new ultimate fidelity frontiers are required for the distortion synthesis crowd. just make sure you avoid the term distortion, call it "spectral enhancement processing" instead. >;-> best, jörn -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net