[vlc-devel] karaoke filter

[Steinar H. Gunderson]

On Fri, Apr 15, 2011 at 07:16:04PM +0800, 郭宇宏 wrote:
>     for(i=0;i<len;i+=nch)
>     {
>         a[i] = (a[i] - a[i+1]) * 0.7;
>         a[i+1]=a[i];
>     }*

My guess is that this is really 1/sqrt(2), which makes sense from an energy
point of view (or at least would, if the channels were independent; if not,
it depends on the correlation), but can cause clipping.

0.5 is the safe choice, of course.

/* Steinar */
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