[Freeswitch-users] Audio clipping in mod_conference

Fri Nov 4 01:10:33 MSK 2011

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
>
>
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>

-- 
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
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