Subject: Re: [linux-audio-dev] XAP spec & PTAF comments [merge]
From: torbenh_AT_gmx.de
Date: Fri Feb 21 2003 - 12:46:24 EET
On Sun, Feb 09, 2003 at 12:16:02AM +0000, Steve Harris wrote:
> On Sat, Feb 08, 2003 at 12:03:01 -0800, Tim Hockin wrote:
> > > Branching to fill your delay line with explit 0.0's intead of reading them
> > > from a buffer of zeros doesn't help. We allready know that reverbs cant
> > > support it at all. Efficieny reasons would also rule out flangers, delays,
> > > most filters and choruses.
> >
> > Maybe I'm missing something, but how can a test that amounts to this NOT be
> > faster than doing any work at all?
> >
> > if (me->silent && XAP_BUF_SILENT(me->in[0]) && XAP_BUF_SILENT(me->in[1])) {
> > return;
> > }
>
> You still have to roll your internal delay lines, its just that you know
> they will only have zeros going into them.
it should be silent if( zeros_pumped_in > delay_samples*n )
with n = min{ n | feedback^n < threshold } -> n = ceil(log_{feedback} threshold)
-- torben Hohn http://galan.sourceforge.net -- The graphical Audio language
This archive was generated by hypermail 2b28 : Fri Feb 21 2003 - 14:58:54 EET