Re: [Audacity-devel] Added play looped function

[Dominic M. <do...@mi...>]

Lee Azzarello wrote:
> On Tue, 27 May 2003, Alexandre Prokoudine wrote:
> 
> 
>>I think it depends on a sample itself.
>>
>>I've just tested looping. In my case there were no clicks. Example
>>is at www.lrn.ru/~avp/files/audacity-loop-test.ogg (640 KBytes),
>>if interested.
> 
> I believe it's not the sample, but the zero crossings that it depends on.
> I got it to click by recording a short piano loop and selecting random
> chunks to loop. To get real hardcore, try selecting very small fragments
> (< 1 second) and looping them. Threre is a wonderful piece of music
> composed this way by a man named Christian Fennez.
> 
> Most other programs (here I go again, if you can't tell already, I use
> audio editing programs a lot) have a default "search for zero crossings"
> option enabled, with the option of turning it off.
> 
> As for the zero-crossing detection algorithm, I don't know the "right"
> way, but I believe there may be some example code online, as it's a pretty
> common feature in recording software.

Let me know if you see any.  Note that the hard part is what to do
when you have multiple tracks out of sync with each other - finding
positive-slope zero crossings is easy, the problem is when there aren't
any that line up between the tracks, what's the next best thing?

Anyway, try hitting 'Z' with Audacity and see if it improves your loops.

- Dominic

> -lee
> 
> 
> 
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