<br><br><div class="gmail_quote">On Tue, May 18, 2010 at 8:45 PM, Ross Johnson <span dir="ltr"><<a href="mailto:Ross.Johnson@homemail.com.au">Ross.Johnson@homemail.com.au</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
But these are both different purposes to finding zero-crossings, which is to find points where the track may be cut without introducing transients - a pretty common requirement but possibly not trivial to do properly.<div>
<div class="h5"><br></div></div></blockquote><div><br>actually, its not possible to do it properly unless you do destructive editing. to get true "click" free edits means that there can be no discontinuity between adjacent samples. in the context of the question, there are only two ways to do this:<br>
<br> 1) find places where the sample value is itself zero<br>OR<br> 2) find places where two adjacent sample values are positive and negative and change one of them to zero, and do the edit immediately before or after that<br>
<br>given that the incidence of samples that are precisely valued at zero, its pretty clear that (1) is not a realistic option. and if you don't want to make changes to the audio data (something ardour works very hard to avoid every doing), (2) is also not an option.<br>
<br>now, clearly, if you knew the material that was going to be placed on either side of a "junction" before doing the cuts, you could look for places where the sample values of the left-hand side piece and right-hand side piece are compatible. unfortunately knowing this ahead of time is pretty limiting to editing workflow. <br>
<br>fundamentally, any time you "cut" audio, you will induce transients unless the signal has some rather unusual properties. whether these transients matter depends on the material and the context. in general, its much better to apply a short fade (which generates some harmonic noise of its own) than try to do a cut in "the right place".<br>
<br>--p<br><br><br><br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div class="h5">
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Best,<br>
P<br>
<br>
<br>
<br>
<br>
On 18 May 2010, at 21:01, <a href="mailto:ardour-users-request@lists.ardour.org" target="_blank">ardour-users-request@lists.ardour.org</a> wrote:<br>
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Today's Topics:<br>
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1. zero crossings when editing audio (Paul Schwebel)<br>
2. Re: zero crossings when editing audio (J?rn Nettingsmeier)<br>
3. Re: zero crossings when editing audio (Ray Rashif)<br>
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Message: 1<br>
Date: Mon, 17 May 2010 22:33:03 -0700 (PDT)<br>
From: Paul Schwebel <<a href="mailto:pschwebe@yahoo.com" target="_blank">pschwebe@yahoo.com</a>><br>
To: <a href="mailto:ardour-users@lists.ardour.org" target="_blank">ardour-users@lists.ardour.org</a><br>
Subject: [Ardour-Users] zero crossings when editing audio<br>
Message-ID: <<a href="mailto:787382.6972.qm@web111504.mail.gq1.yahoo.com" target="_blank">787382.6972.qm@web111504.mail.gq1.yahoo.com</a>><br>
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<br>
When editing audio, is there a way to easily set the edit area to a zero crossing? I can't find any such option and the tutorial doesn't really cover edits of this kind.<br>
<br>
Thank you,<br>
-Paul<br>
<br>
<br>
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<br>
Message: 2<br>
Date: Tue, 18 May 2010 08:59:46 +0200<br>
From: J?rn Nettingsmeier <<a href="mailto:nettings@stackingdwarves.net" target="_blank">nettings@stackingdwarves.net</a>><br>
To: <a href="mailto:ardour-users@lists.ardour.org" target="_blank">ardour-users@lists.ardour.org</a><br>
Subject: Re: [Ardour-Users] zero crossings when editing audio<br>
Message-ID: <<a href="mailto:4BF23AE2.6080808@stackingdwarves.net" target="_blank">4BF23AE2.6080808@stackingdwarves.net</a>><br>
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On 05/18/2010 07:33 AM, Paul Schwebel wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
When editing audio, is there a way to easily set the edit area to a zero crossing? I can't find any such option and the tutorial doesn't really cover edits of this kind.<br>
</blockquote>
<br>
afaik, there isn't. but it doesn't help much, anyways. the problem is<br>
that there will be clicks whenever the waveform has a "sharp corner",<br>
and this can happen even when both spliced ends are at a zero crossing.<br>
ardour will use very short fades to get rid of clicks, which works better.<br>
<br>
hth,<br>
<br>
j?rn<br>
<br>
<br>
-- <br>
J?rn Nettingsmeier<br>
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487<br>
<br>
Meister f?r Veranstaltungstechnik (B?hne/Studio), Elektrofachkraft<br>
Audio and event engineer - Ambisonic surround recordings<br>
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<a href="http://stackingdwarves.net" target="_blank">http://stackingdwarves.net</a><br>
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<br>
<br>
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<br>
Message: 3<br>
Date: Tue, 18 May 2010 16:00:19 +0800<br>
From: Ray Rashif <<a href="mailto:schivmeister@gmail.com" target="_blank">schivmeister@gmail.com</a>><br>
To: ardour-users <<a href="mailto:ardour-users@lists.ardour.org" target="_blank">ardour-users@lists.ardour.org</a>><br>
Subject: Re: [Ardour-Users] zero crossings when editing audio<br>
Message-ID:<br>
<<a href="mailto:AANLkTikZkrzmgM9uzBnu8v48X7HwZMrZRyRJV9q-NeAI@mail.gmail.com" target="_blank">AANLkTikZkrzmgM9uzBnu8v48X7HwZMrZRyRJV9q-NeAI@mail.gmail.com</a>><br>
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<br>
On 18/05/2010, J?rn Nettingsmeier <<a href="mailto:nettings@stackingdwarves.net" target="_blank">nettings@stackingdwarves.net</a>> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On 05/18/2010 07:33 AM, Paul Schwebel wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
When editing audio, is there a way to easily set the edit area to a zero<br>
crossing? I can't find any such option and the tutorial doesn't really<br>
cover edits of this kind.<br>
</blockquote>
<br>
afaik, there isn't. but it doesn't help much, anyways. the problem is<br>
that there will be clicks whenever the waveform has a "sharp corner",<br>
and this can happen even when both spliced ends are at a zero crossing.<br>
ardour will use very short fades to get rid of clicks, which works better.<br>
</blockquote>
<br>
Is there even such a thing as set-edit-on-zero-crossing? I've always<br>
done seek-fix-and-match for regions that do not have a continuous<br>
waveform, i.e clicks. But often times you need sample-level zoom<br>
factor to fix the tricky ones.<br>
<br>
<br>
-- <br>
GPG/PGP ID: B42DDCAD<br>
<br>
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