[asterisk-users] Improve voice quality on Asterisk + chan_capi+DIVA BRI

[Armin Schindler]

On Fri, 20 Apr 2007, Cosmin Prund wrote:
> I've implemented my IVR using an FastAGI thing, using the READ
> application. "core show application read" shows no information on how
> the read function gets it's digits, I assume it does it the right way.
> With DTMF clamping off it works, with DTMF clamping on it no longer
> works. I've also toggled the "softftfm" setting in capi.conf, no luck
> ether way.
> 
> Is there anything else I can try? Did I miss the obvious (it would not
> be my first)

Can you please create a capi log:
  set verbose 5
  capi debug
to see what really happens via the interface?

Armin

> > -----Original Message-----
> > From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> > bounces at lists.digium.com] On Behalf Of Armin Schindler
> > Sent: 20 aprilie 2007 12:32
> > To: Asterisk Users Mailing List - Non-Commercial Discussion
> > Subject: RE: [asterisk-users] Improve voice quality on Asterisk +
> > chan_capi+DIVA BRI
> > 
> > On Fri, 20 Apr 2007, Cosmin Prund wrote:
> > > Ok, I've made all those changes, called my operator from an outside
> > line
> > > and tried alternatively whispering / shouting into the mic, banging
> > the
> > > microphone with a metal object and pressing DTMF digits.
> > >
> > > So far - so good, it seems to work.
> > >
> > > I've now got an other problem. Clamping DTMF disabled my IVR! Is
> > there
> > > any way to enable/disable DTMF clamping on a per-call basis? Or
> > better,
> > > disable DTMF only when the call makes it to an operator?
> > 
> > This is possible, but such a command/feature must be implemented into
> > chan-capi first.
> > Anyway, even with DTMF clamping the DTMF detection is activated. So
> > Asterisk should get the DTMF infos. Or is your IVR doing own DTMF
> > detection on voice data? If yes, you should change that.
> > 
> > Armin
> > 
> > > > -----Original Message-----
> > > > From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-
> > users-
> > > > bounces at lists.digium.com] On Behalf Of Armin Schindler
> > > > Sent: 19 aprilie 2007 14:35
> > > > To: Asterisk Users Mailing List - Non-Commercial Discussion
> > > > Subject: Re: [asterisk-users] Improve voice quality on Asterisk +
> > > > chan_capi+ DIVA BRI
> > > >
> > > > On Thu, 19 Apr 2007, Cosmin Prund wrote:
> > > > > Hello everyone!
> > > > >
> > > > > I've got a Eicon Diva Server BRI card into my "*" box working
> > just
> > > > fine,
> > > > > but I wander if there's anything I can do to improve voice
> > quality
> > > > for
> > > > > my operators. I'm thinking something along the lines of "auto
> > gain"
> > > > and
> > > > > sudden noise suppression (like when you hit a fax machine or the
> > > > other
> > > > > party accidently touches the dial pad on the phone).
> > > > >
> > > > > Does one of Asterisk, chan_capi or the Diva driver have support
> > for
> > > > such
> > > > > functionality?
> > > >
> > > > Sure, with the Dialogic (Eicon) DIVA Server card DSPs, you have
> the
> > > > following possibilities:
> > > >
> > > > 1. Automatic Gain Control and Active Talker Evaluation in
> > conference
> > > > (by
> > > >    default automatically activated with three or more parties)
> > > > 2. Recording Stream Automatic Gain Control
> > > > 3. Manual Control of Signal Level
> > > > 4. Manual control of the signal pitch and/or bitrate (rate
> > conversion)
> > > > 5. Suppression of DTMF tones. This feature can be activated using
> > > > adapter
> > > >    configuration (for all calls) or on per call basis
> > > >    This is always good to activate this feature for operators to
> > > > protect
> > > >    people from signals or in one gateway to prevent DTMF tones
> from
> > > > passing
> > > >    through gateway in band.
> > > >    The DTMF tones are suppressed in the way which will not affect
> > the
> > > >    quality of the voice signal in case voice signal and DTMF tones
> > > > overlap.
> > > > 6. Part 68 Voice Signal Limiter (Required in US, by default
> > > deactivated
> > > > in
> > > >    Europe). This protects the ears from "clicks" and too loud
> > signals.
> > > > This
> > > >    feature can be activated using the configuration. This is good
> > idea
> > > > to
> > > >    activate Part 68 voice signal limiter to protect the people.
> > This
> > > is
> > > > the
> > > >    dynamic voice signal limiter in accordance with Part 68 of US
> > > >    requirements.
> > > >
> > > > The Part 68 Limiter, Audio Recording Automatic Gain Control (AGC
> of
> > > > received signal) and the DTMF Clamping (Suppression of DTMF tones)
> > are
> > > > can be controlled using adapter configuration and do not require
> > any
> > > > change in the application (but can be controlled on the per call
> > basis
> > > > too, which is not implemented in chan-capi yet).
> > > >
> > > >
> > > > Armin
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