[PD] Finding zero crossing

[Ed Kelly]

Hi John,

I made an object to do just that. zeroxpos~
Have a look at the help file - it finds the 1st, 2nd or 3rd etc zero crossing within a block of audio.
It's quite tricky to remove discontinuities though, and even when you start a chunk on a zero-crossing point it does not guarantee there won't be a click. Often there is anyway (because the signal goes from no activity to lots instantaneously).

A a very short <5ms fade as Tim suggests might be better - but try it anyway.

Best,
Ed

--- On Tue, 4/8/09, john canning <johnnyboy7777 at hotmail.co.uk> wrote:

> From: john canning <johnnyboy7777 at hotmail.co.uk>
> Subject: [PD] Finding zero crossing
> To: "Pure Data" <pd-list at iem.at>
> Date: Tuesday, 4 August, 2009, 4:29 PM
> 
> 
> 
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> 
>  
> Hi Folks,
> 
> I have built a loop cutter that lets you rearrange a loop
> using radio buttons. The main playback object is a phasor~.
> Each radio button sends a number corresponding to a specific
> 16th to the phasor~ which then jumps to the correct part of
> the loop. The main trouble I'm having is audio
> discontinuities as I have no way of shifting the cuts to
> land on zero crossings. Has anyone any idea how to fix this,
> either automatically or manually?  
> 
> Cheers,
> John
> 
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