[Freeswitch-users] Audio clipping in mod_conference

Fri Nov 4 02:06:10 MSK 2011

Does auto-record make a difference -- I know you don't use that feature?

Anthony Minessale <anthony.minessale at gmail.com> wrote:

> well you call 888 every week and its the same software =p
> 
> 
> On Thu, Nov 3, 2011 at 5:08 PM, <covici at ccs.covici.com> wrote:
> 
> > I will have to check that out, although I am pretty sure I did test, but
> > that was when I first started.
> >
> > Anthony Minessale <anthony.minessale at gmail.com> wrote:
> >
> > > it's not,
> > >
> > > most likely you have a jitterbuffer on your phone that is recharging when
> > > you start talking.
> > > are you on the latest GIT where we have the waste bandwidth flag
> > > on permanently for all callers?
> > > To avoid problems like this conferences now always send rtp to people
> > even
> > > when they are not getting any useful input.
> > >
> > >
> > > 2011/11/3 Roland Hänel <roland at haenel.me>
> > >
> > > > Anthony,
> > > >
> > > > The problem is not that audio is clipped because its "too silent", so
> > > > adjusting the value seems to be the wrong handle for this problem.
> > > >
> > > > It seems that the time needed to make the decision (regardless of the
> > > > energy threshold value) is the core of the issue, i.e. the level may
> > bei
> > > > 100, 200 or 300, it takes some XX ms to detect talking and all audio
> > that
> > > > happens before the detection gets lost. Right?
> > > >
> > > > Greetings,
> > > > Roland
> > > >
> > > >
> > > >
> > > > 2011/11/3 Anthony Minessale <anthony.minessale at gmail.com>
> > > >
> > > >> The setting is an arbitrary number of the energy score required to
> > count
> > > >> as talking.
> > > >>
> > > >>
> > > >> check your environments, its very specific to the surroundings.
> > > >> We run it at 200 in the main FS conf and its rarely an issue.
> > > >>
> > > >>
> > > >>
> > > >>
> > > >> 2011/11/3 Roland Hänel <roland at haenel.me>
> > > >>
> > > >>> Setting it to 10 or so doesn't help, it seems that just the
> > threshold of
> > > >>> detection is changed (ok, that's what is expected), not the time
> > until the
> > > >>> decision is made.
> > > >>>
> > > >>> The audio clipping is a timing issue.
> > > >>> Does there exist something like a "minimum time" that this algorithm
> > > >>> needs to detect talking after silence? What happens to the audio
> > that was
> > > >>> sent by that member during this time, does.the algorithm discard
> > that?
> > > >>>
> > > >>> Greetings,
> > > >>> Roland
> > > >>> Am 03.11.2011 18:20 schrieb "Anthony Minessale" <
> > > >>> anthony.minessale at gmail.com>:
> > > >>>
> > > >>>  yes? set it to something between what it was and 0 ?
> > > >>>>
> > > >>>>  <param name="energy-level" value="300"/>
> > > >>>>
> > > >>>> try 200 100 50 ?
> > > >>>>
> > > >>>> 2011/11/3 Roland Hänel <roland at haenel.me>
> > > >>>>
> > > >>>>> Hi,
> > > >>>>>
> > > >>>>> During thorough testing of our conference solution which is based
> > on
> > > >>>>> FreeSwitch / mod_conference, we noticed some 'audio clipping'
> > during the
> > > >>>>> conference. Typically, if a conference member didn't have audio
> > for some
> > > >>>>> time and then begins to speak, the first syllable will be clipped
> > and
> > > >>>>> cannot be heard by the other conference participants.
> > > >>>>>
> > > >>>>> We ruled out a number of possible causes, and finally discovered
> > that
> > > >>>>> the energy level detection algorith seems to be the source of the
> > problem.
> > > >>>>> Setting the energy level for all participants to "0" heals the
> > problem (of
> > > >>>>> course now the noise might be higher since every participant's
> > noise
> > > >>>>> contributes to the total noise), but this setting is not very
> > useful since
> > > >>>>> the "talking detection" seems to rely on the same level, i.e. with
> > energy
> > > >>>>> "0", all members are marked talking all the time (which
> > effectively renders
> > > >>>>> the "talking" display useless).
> > > >>>>>
> > > >>>>> Is there any chance to tune the energy level detection time (!),
> > or to
> > > >>>>> de-couple talking detection an energy level detection in
> > FreeSwitch?
> > > >>>>>
> > > >>>>> Best regards,
> > > >>>>> Roland
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> FreeSWITCH-users mailing list
> > > >>>>> FreeSWITCH-users at lists.freeswitch.org
> > > >>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> > > >>>>> UNSUBSCRIBE:
> > > >>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
> > > >>>>> http://www.freeswitch.org
> > > >>>>>
> > > >>>>>
> > > >>>>
> > > >>>>
> > > >>>> --
> > > >>>> Anthony Minessale II
> > > >>>>
> > > >>>> FreeSWITCH http://www.freeswitch.org/
> > > >>>> ClueCon http://www.cluecon.com/
> > > >>>> Twitter: http://twitter.com/FreeSWITCH_wire
> > > >>>>
> > > >>>> AIM: anthm
> > > >>>> MSN:anthony_minessale at hotmail.com
> > > >>>> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
> > > >>>> IRC: irc.freenode.net #freeswitch
> > > >>>>
> > > >>>> FreeSWITCH Developer Conference
> > > >>>> sip:888 at conference.freeswitch.org
> > > >>>> googletalk:conf+888 at conference.freeswitch.org
> > > >>>> pstn:+19193869900
> > > >>>>
> > > >>>>
> > > >>>> FreeSWITCH-users mailing list
> > > >>>> FreeSWITCH-users at lists.freeswitch.org
> > > >>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> > > >>>> UNSUBSCRIBE:
> > > >>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
> > > >>>> http://www.freeswitch.org
> > > >>>>
> > > >>>>
> > > >>>
> > > >>> FreeSWITCH-users mailing list
> > > >>> FreeSWITCH-users at lists.freeswitch.org
> > > >>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> > > >>> UNSUBSCRIBE:
> > http://lists.freeswitch.org/mailman/options/freeswitch-users
> > > >>> http://www.freeswitch.org
> > > >>>
> > > >>>
> > > >>
> > > >>
> > > >> --
> > > >> Anthony Minessale II
> > > >>
> > > >> FreeSWITCH http://www.freeswitch.org/
> > > >> ClueCon http://www.cluecon.com/
> > > >> Twitter: http://twitter.com/FreeSWITCH_wire
> > > >>
> > > >> AIM: anthm
> > > >> MSN:anthony_minessale at hotmail.com
> > > >> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
> > > >> IRC: irc.freenode.net #freeswitch
> > > >>
> > > >> FreeSWITCH Developer Conference
> > > >> sip:888 at conference.freeswitch.org
> > > >> googletalk:conf+888 at conference.freeswitch.org
> > > >> pstn:+19193869900
> > > >>
> > > >>
> > > >> FreeSWITCH-users mailing list
> > > >> FreeSWITCH-users at lists.freeswitch.org
> > > >> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> > > >> UNSUBSCRIBE:
> > http://lists.freeswitch.org/mailman/options/freeswitch-users
> > > >> http://www.freeswitch.org
> > > >>
> > > >>
> > > >
> > > >
> > > > --
> > > > Gruß,
> > > > Roland
> > > >
> > > >
> > > >
> > > >
> > > > FreeSWITCH-users mailing list
> > > > FreeSWITCH-users at lists.freeswitch.org
> > > > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> > > > UNSUBSCRIBE:
> > http://lists.freeswitch.org/mailman/options/freeswitch-users
> > > > http://www.freeswitch.org
> > > >
> > > >
> > >
> > >
> > > --
> > > Anthony Minessale II
> > >
> > > FreeSWITCH http://www.freeswitch.org/
> > > ClueCon http://www.cluecon.com/
> > > Twitter: http://twitter.com/FreeSWITCH_wire
> > >
> > > AIM: anthm
> > > MSN:anthony_minessale at hotmail.com
> > > GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
> > > IRC: irc.freenode.net #freeswitch
> > >
> > > FreeSWITCH Developer Conference
> > > sip:888 at conference.freeswitch.org
> > > googletalk:conf+888 at conference.freeswitch.org
> > > pstn:+19193869900
> > >
> > > ----------------------------------------------------
> > > Alternatives:
> > >
> > > ----------------------------------------------------
> > >
> > > FreeSWITCH-users mailing list
> > > FreeSWITCH-users at lists.freeswitch.org
> > > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> > > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> > > http://www.freeswitch.org
> >
> > --
> > Your life is like a penny.  You're going to lose it.  The question is:
> > How do
> > you spend it?
> >
> >         John Covici
> >         covici at ccs.covici.com
> >
> >
> > FreeSWITCH-users mailing list
> > FreeSWITCH-users at lists.freeswitch.org
> > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> > http://www.freeswitch.org
> >
> 
> 
> 
> -- 
> Anthony Minessale II
> 
> FreeSWITCH http://www.freeswitch.org/
> ClueCon http://www.cluecon.com/
> Twitter: http://twitter.com/FreeSWITCH_wire
> 
> AIM: anthm
> MSN:anthony_minessale at hotmail.com
> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
> IRC: irc.freenode.net #freeswitch
> 
> FreeSWITCH Developer Conference
> sip:888 at conference.freeswitch.org
> googletalk:conf+888 at conference.freeswitch.org
> pstn:+19193869900
> 
> ----------------------------------------------------
> Alternatives:
> 
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> 
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-- 
Your life is like a penny.  You're going to lose it.  The question is:
How do
you spend it?

         John Covici
         covici at ccs.covici.com