Re: [PD] PD sound quality question
On Sun, 24 May 2009 00:07:45 -0400 Hector Centeno hcen...@gmail.com wrote: So my questions are: is this aliasing a particular problem of my system or is this an expected result? It's an expected result. It isn't 'aliasing', but an effect called quantisation, which you will hear even in perfectly sampled data. Is there anyway of avoiding it? I could post the patch here if needed. [tabread4~] already goes some way towards avoiding it, by interpolating (going in-between the sample values) to make the playback smoother. Since you seem interested in the low frequencies found when slowing sounds down it might help to add a low pass filter that smoothes the signal even more. Andy Cheers, Hector ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list -- Use the source ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] PD sound quality question
Andy Farnell wrote: On Sun, 24 May 2009 00:07:45 -0400 Hector Centeno hcen...@gmail.com wrote: So my questions are: is this aliasing a particular problem of my system or is this an expected result? It's an expected result. It isn't 'aliasing', but an effect called quantisation, which you will hear even in perfectly sampled data. Is there anyway of avoiding it? I could post the patch here if needed. [tabread4~] already goes some way towards avoiding it, by interpolating (going in-between the sample values) to make the playback smoother. Except Pd's 4-point interpolation is at best suboptimal... http://lists.puredata.info/pipermail/pd-list/2008-06/062878.html Try tabread4c~ or whatever and compare.. ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] PD sound quality question
From: Hector Centeno hcen...@gmail.com Subject: [PD] PD sound quality question To: Pd List pd-l...@iem.kug.ac.at Message-ID: 695e1a650905232107g4580179bq7c7e12aee0cbb...@mail.gmail.com Content-Type: text/plain; charset=ISO-8859-1 Hello, I'm in the process of learning more about PD so I've been checking some of the patches that are part of Johannes Kreidler's excellent tutorial Programming Electronic Music in Pd ( http://www.pd-tutorial.com/ ). Today I was playing a bit with the sampler-big.pd which is a sound sampler with adjustable speed and start/end points. I noticed that as I made playback speed slower I started to hear quite noticeable aliasing. The patch uses [tabread4~] for reading the sound array. So my questions are: is this aliasing a particular problem of my system or is this an expected result? Is there anyway of avoiding it? I could post the patch here if needed. Cheers, Hector If you haven't yet, read the following thread -- I think it goes well into July of 2008: http://lists.puredata.info/pipermail/pd-list/2008-06/062878.html ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] PD sound quality question
Hello, I'm in the process of learning more about PD so I've been checking some of the patches that are part of Johannes Kreidler's excellent tutorial Programming Electronic Music in Pd ( http://www.pd-tutorial.com/ ). Today I was playing a bit with the sampler-big.pd which is a sound sampler with adjustable speed and start/end points. I noticed that as I made playback speed slower I started to hear quite noticeable aliasing. The patch uses [tabread4~] for reading the sound array. So my questions are: is this aliasing a particular problem of my system or is this an expected result? Is there anyway of avoiding it? I could post the patch here if needed. Cheers, Hector ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
