[Freeswitch-users] Audio clipping in mod_conference

Fri Nov 4 01:08:45 MSK 2011

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
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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
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> >>>>
> >>>>
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> >>>>
> >>>>
> >>>
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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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> >>
> >>
> >
> >
> > --
> > Gruß,
> > Roland
> >
> >
> >
> >
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> >
> >
> 
> 
> -- 
> Anthony Minessale II
> 
> FreeSWITCH http://www.freeswitch.org/
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> 
> AIM: anthm
> MSN:anthony_minessale at hotmail.com
> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
> IRC: irc.freenode.net #freeswitch
> 
> FreeSWITCH Developer Conference
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> 
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