Re: [SoX-users] looking for a really tight (48db) lowpass filter with minimal effect on the remaini

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Fundamentally, SoX supports biquadds, so any filter after its transfer function is expressed as biquads can be implemented.

My earlier comments on phase vs magnitude response and pre-echoes still stand.

Regards,
  Sergei.

--- On Mon, 1/21/13, Jerry <lan...@qw...> wrote:

> From: Jerry <lan...@qw...>
> Subject: Re: [SoX-users] looking for a really tight (48db) lowpass filter with minimal effect on the remaining stuff
> To: sox...@li...
> Date: Monday, January 21, 2013, 6:46 PM
> 
> On Jan 21, 2013, at 2:42 PM, Fmiser wrote:
> 
> >> Benjamin Wild wrote:
> > 
> >> another wish of mine is to have a really tight
> (48db) lowpass
> >> filter with minimal effect on the remaining stuff.
> > 
> > So would at least 10,000 other people - including me.
> :)
> > 
> >> it would be really nice to have a filter to remove
> those
> >> things without touching the rest..
> > 
> > Gentle filters sound better.  Abrupt filters keep
> the junk out.
> > _You_ have to decide what is an appropriate compromise
> for your
> > content and your ears.  Sorry.
> > 
> > The SoX command "lowpass" is a 3 or 6 dB/octave, so
> that
> > probably isn't abrupt enough for you.
> 
> Surely you don't mean 3 db/octave.
> Jerry
> > 
> > The command "filter" can be used.  It also
> supports "plot" if
> > you wish to see a graph.  The man page give
> details on how to
> > use it.
> > 
> > --   Philip
> 
> 
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