Thread: [Audacity-devel] Audacity clamps the last sample to zero (fwd)
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From: Matt B. <mbr...@cs...> - 2005-02-26 19:04:29
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An interesting problem was reported to audacity-help. I don't know if this was caused by the Audacity 1.3 multi-clip problems; I think I've seen something similar in Audacity 1.2 but I'm not sure. ---------- Forwarded message ---------- From: Paul Surgeon <su...@te...> To: aud...@li... Date: Thu, 24 Feb 2005 19:37:10 +0200 Subject: [Audacity-help] Audacity clamps the last sample to zero I am trying to hand edit a waveform from a recording of a tone generator and then copy and paste it till I get a sample that is 600ms in length. Step 1 : I edit the waveform by hand and duplicate it once so that I can match up the edges. http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob1.png Note that the display doesn't seem to update correctly and I get two lines appearing although only one of them will respond to editing. Step 2 : Here is the waveform that has had the edges matched correctly. http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob2.png Step 3 : Here is the correct waveform sample in it's entirety. http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob3.png Step 4 : I copy and paste the waveform several times to extend the length of the tone. Notice that everything matches up properly. http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob4.png Step 5 : I export the tone as a wave file and reopen it in audacity and this is what I get. http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob5.png Notice the nice glitches that appear because Audacity has the audacity to clamp the last samples of each waveform to zero before exporting it. :( This is very annoying. I want Audacity to leave my hand edited samples alone and only join them - not modify them without my consent. Thanks Paul ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click -- Audacity-help mailing list Aud...@li... https://lists.sourceforge.net/lists/listinfo/audacity-help |
From: David S. <dav...@vc...> - 2005-02-26 19:21:43
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I don't know if he'll get the same problem using Nyquist. Under the Nyquist prompt in the effects menu type: (extract-abs start-time stop-time s) For example (extract-abs 0.0 0.6 s) for cutting the first 600ms of the selected audio. I didn't know there was another Audacity list, Audacity-help. Does that cover similar topics as Audacity-users? David On Sat, 26 Feb 2005, Matt Brubeck wrote: > An interesting problem was reported to audacity-help. I don't know if > this was caused by the Audacity 1.3 multi-clip problems; I think I've > seen something similar in Audacity 1.2 but I'm not sure. > > ---------- Forwarded message ---------- > From: Paul Surgeon <su...@te...> > To: aud...@li... > Date: Thu, 24 Feb 2005 19:37:10 +0200 > Subject: [Audacity-help] Audacity clamps the last sample to zero > > I am trying to hand edit a waveform from a recording of a tone generator and > then copy and paste it till I get a sample that is 600ms in length. > > Step 1 : > I edit the waveform by hand and duplicate it once so that I can match up the > edges. > http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob1.png > > Note that the display doesn't seem to update correctly and I get two lines > appearing although only one of them will respond to editing. > > Step 2 : > Here is the waveform that has had the edges matched correctly. > http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob2.png > > Step 3 : > Here is the correct waveform sample in it's entirety. > http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob3.png > > Step 4 : > I copy and paste the waveform several times to extend the length of the tone. > Notice that everything matches up properly. > http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob4.png > > Step 5 : > I export the tone as a wave file and reopen it in audacity and this is what I > get. > http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob5.png > > Notice the nice glitches that appear because Audacity has the audacity to > clamp the last samples of each waveform to zero before exporting it. :( > > This is very annoying. I want Audacity to leave my hand edited samples alone > and only join them - not modify them without my consent. > > Thanks > Paul > > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > -- > Audacity-help mailing list > Aud...@li... > https://lists.sourceforge.net/lists/listinfo/audacity-help > > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > _______________________________________________ > Audacity-devel mailing list > Aud...@li... > https://lists.sourceforge.net/lists/listinfo/audacity-devel > |
From: Markus M. <me...@me...> - 2005-02-26 19:21:15
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This could very well be caused by multi-clip support. Seems like a rounding problem at the edge to me. Unfortunately, I don't have time to look at it at the moment, because I'm preparing for my final exams at the moment, but if you add it to Bugzilla and assign it to me, I'll have a look at it later (in a few weeks). Markus Matt Brubeck schrieb: >An interesting problem was reported to audacity-help. I don't know if >this was caused by the Audacity 1.3 multi-clip problems; I think I've >seen something similar in Audacity 1.2 but I'm not sure. > >---------- Forwarded message ---------- > From: Paul Surgeon <su...@te...> > To: aud...@li... > Date: Thu, 24 Feb 2005 19:37:10 +0200 > Subject: [Audacity-help] Audacity clamps the last sample to zero > >I am trying to hand edit a waveform from a recording of a tone generator and >then copy and paste it till I get a sample that is 600ms in length. > >Step 1 : >I edit the waveform by hand and duplicate it once so that I can match up the >edges. >http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob1.png > >Note that the display doesn't seem to update correctly and I get two lines >appearing although only one of them will respond to editing. > >Step 2 : >Here is the waveform that has had the edges matched correctly. >http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob2.png > >Step 3 : >Here is the correct waveform sample in it's entirety. >http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob3.png > >Step 4 : >I copy and paste the waveform several times to extend the length of the tone. >Notice that everything matches up properly. >http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob4.png > >Step 5 : >I export the tone as a wave file and reopen it in audacity and this is what I >get. >http://surgdom.hollosite.com/flightgear/screenshots/images/tmp/wavprob5.png > >Notice the nice glitches that appear because Audacity has the audacity to >clamp the last samples of each waveform to zero before exporting it. :( > >This is very annoying. I want Audacity to leave my hand edited samples alone >and only join them - not modify them without my consent. > >Thanks >Paul > > >------------------------------------------------------- >SF email is sponsored by - The IT Product Guide >Read honest & candid reviews on hundreds of IT Products from real users. >Discover which products truly live up to the hype. Start reading now. >http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > > |