[Freeswitch-users] Mod_Conference Improvement (Denoise)

Thu Jan 17 14:22:17 MSK 2013

The problem with agc is thatit changed levels a lot within the same
speaker and thus lessened the sound quality when I was using it.

William King <william.king at quentustech.com> wrote:

> That feature already exists, but appears to still be undocumented. Added
> just over a year ago.
> http://wiki.freeswitch.org/wiki/FS_weekly_2011_03_23
> 
> William King
> Senior Engineer
> Quentus Technologies, INC
> 1037 NE 65th St Suite 273
> Seattle, WA 98115
> Main:   (877) 211-9337
> Office: (206) 388-4772
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> william.king at quentustech.com
> 
> On 01/16/2013 10:29 PM, Valer Nur wrote:
> > I think the best way to solve this is by doing AGC first. This should
> > make sure audio level is similar for all participants.
> > 
> > 
> > ------------------------------------------------------------------------
> > *From:* Anthony Minessale <anthony.minessale at gmail.com>
> > *To:* FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
> > *Sent:* Wednesday, January 16, 2013 6:23 PM
> > *Subject:* Re: [Freeswitch-users] Mod_Conference Improvement (Denoise)
> > 
> > There is also the preprocess app which uses a media bug in the core for
> > a variety of things but is incomplete it's using a bit of code from
> > speex so we can certainly improve that as well.
> > 
> >  
> > 
> > 
> > On Tue, Jan 15, 2013 at 8:58 PM, Michael Jerris <mike at jerris.com
> > <mailto:mike at jerris.com>> wrote:
> > 
> >     If you wanted to implement something like this you could do so as a
> >     media bug, it does not need to touch mod_conference in any way.
> >      Take a look at mod_ladspa for an example of a similar module that
> >     modifies audio using a media bug.  Give it a try and see if you can
> >     get something working.
> > 
> >     Mike
> > 
> >     On Jan 15, 2013, at 8:03 PM, Michael Collins <msc at freeswitch.org
> >     <mailto:msc at freeswitch.org>> wrote:
> > 
> >>     While I don't have a problem with the concept of noise filtering I
> >>     have to point out that each member of the conference can have his
> >>     or her own noise level setting. From fs_cli:
> >>
> >>     conference <conf name> energy <member_id|all|last|non_moderator>
> >>     [<newval>]
> >>
> >>     You only need to apply it to the person who is in the noisy
> >>     location. In fact, in the example configuration the user can dial
> >>     9 to increase the energy threshold (for when he's in a noisy
> >>     environment) or press 7 to decrease the threshold. Pressing 8 will
> >>     reset the energy to normal, which I believe is 200.
> >>
> >>     -MC
> >>
> >>     On Tue, Jan 15, 2013 at 4:24 PM, Usama Zaidi <itsusama at gmail.com
> >>     <mailto:itsusama at gmail.com>> wrote:
> >>
> >>         Hi,
> >>
> >>         I talked about this a while back on the channel, the way how
> >>         energy-level is implemented in mod_conference isn't the right
> >>         way to handle noise in my opinion because the participants
> >>         that get bridged would have a different noise floor depending
> >>         on where they are located, so if I set the value of
> >>         energy-level too high to accommodate one participant, any
> >>         other participant in a quite sitting would never get bridged,
> >>         I proposed we should tackle this the way Asterisk does using a
> >>         denoise dialplan function
> >>         (https://wiki.asterisk.org/wiki/display/AST/Asterisk+10+Function_DENOISE),
> >>         we can use libav for noise filtering on the muxed audio. I'm
> >>         willing to contribute if one of the devs would help me out
> >>         regarding implementation. Any comments?
> >>
> >>         -Regards
> >>
> >>
> > 
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> > -- 
> > Anthony Minessale II
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