Thread: [Audacity-devel] Fwd: Zero-crossings
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From: Dominic M. <do...@mi...> - 2002-08-30 16:04:53
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Let me know if anyone has any ideas on how to implement zero crossings...I have some ideas, but nothing brilliant. Maybe we should let the user configure how far it looks for a good crossing point? - Dominic -------- Original Message -------- Subject: Re: [Audacity-devel] Feature request: Extend selection to next Zero Crossing. Date: Fri, 30 Aug 2002 11:27:49 -0400 From: William Cattey <wdc@MIT.EDU> To: Dominic Mazzoni <do...@mi...> Thanks so much for the reply! I do not know exactly how Cool Edit deals with the issue of Zero Crossings in stereo, but I have a guess: I've noticed sometimes that the selection makes a much bigger jump than I expected, so my guess is that it extends and keeps looking until it finds a zero crossing at the same time in both channels. On the one hand, it's kind of unfortunate that a selection may extend much more than you expect. On the other hand, it seems like there really is no alternative. A zero crossing is needed in both channels at the same time. -wdc On Friday, August 30, 2002, at 03:12 AM, Dominic Mazzoni wrote: > Bill, > > We don't have zero-crossing support yet, but it's on my TODO list. > > Actually one reason I haven't implemented that yet is that > I haven't figured out what to do with stereo. What should > Audacity do when the user has two tracks selected, and they > don't cross zero at the same place? > > If you know how CoolEdit resolves this problem, please let > me know. (I never use Windows anymore, so I can't just see > for myself very easily.) If you have your own ideas on how > this should work, I'd be interested to hear that, too. > > Thanks, > Dominic > > > Bill Cattey wrote: >> I think it's great that folks are developing a free software, >> multi-platform audio editor. THANK YOU! >> Unfortunately, there's something I do a LOT that I can't figure out how >> to do in audacity: Grab hold of a selection inside complex audio, >> without any POP at the beginning and end. >> I use Cool Edit 2000 for most of my audio editing but I'm trying to get >> something that runs on Mac OS X or Linux. Even in Cool Edit 96, there >> were commands to enable you to extend (or shrink) the selection (either >> to the left or to the right) to the next Zero crossing (I.E. Where the >> sound amplitude was 0.) In this way you were one menu command away >> from >> being able to grab hold of a selection with a CLEAN beginning and end. >> I noticed that Cacophony for Mac OS X has arrow keys that can affect >> the >> selection, so that after only ten minutes or so of fooling around, I >> could finally manage to get a clean sounding selection. But the BEST >> way is to have commands that go to Zero crossings. >> Why do I want this? So that I can do things like take the previous >> instrumental measure, and write it over the next measure that has >> singing in it. >> ---- >> While I'm sending you input, I have two other enhancements to request: >> 1. Make the zero crossing on the waveform display more obvious. >> Having a color change, or a line through the zero point would be a >> great >> help in understanding the waveform I'm looking at. Zero crossings, not >> only to the ear, but also to the eye are one of the most significant >> bits of understanding one needs when one fools with audio. >> PLEASE consider enhancing the waveform display in this way. (Cacophony >> added a color change at 0 to version 1.2 that came out last week.) >> 2. Have an easier way to resize the waveforms. >> Why is it that, in order to enlarge the waveforms I see, the interface >> requires me to resize the window and then resize each individual >> channel >> on display? It would be very nice if there were some kind of way to >> say, "When the application window is resized, everything resizes >> proportionally." >> Again, thanks for all the work! >> Bill Cattey >> Massachusetts Institute of Technology >> ------------------------------------------------------- >> This sf.net email is sponsored by: Jabber - The world's fastest >> growing real-time communications platform! Don't just IM. Build it in! >> http://www.jabber.com/osdn/xim >> _______________________________________________ >> Audacity-devel mailing list >> Aud...@li... >> https://lists.sourceforge.net/lists/listinfo/audacity-devel > > |