[arm-allstar] Distorted audio (sampling?)

[Alessio Sacchi]

Thanks David. Got some samples converted.

Restarting asterisk did not solve the proble. Rebooting the PI fixed it
twice - after the first reboot I described above, it started degrading
again and I had to restart the RPi again after about 24 hrs. We are now
running since 3 days from that restart and audio is still good. But most
importantly no - stopping and starting asterisk was not helping at all.

Alessio

On Sat, Sep 14, 2019 at 2:05 AM David McGough <kb4fxc at inttek.net> wrote:

>
> Alessio,
>
> Interesting that rebooting the RPi3B fixes the issue. Does stopping and
> starting Asterisk also fix the issue?
>
> To convert uLAW (pcm) files to wav files, one way is with the sox
> software, like:
>
> sox -t ul -c 1 -r 8000 allstar_audio_file.pcm  output_file.wav
>
>
> 73, David KB4FXC
>
>
> On Fri, 13 Sep 2019, "Alessio Sacchi via ARM-allstar" wrote:
>
> > Danny, David
> >
> > I could certainly take a generator up to the site on my next trip.
> Speaking
> > of adding a tone, I remember I used a "generate continuous tone" in ASL
> > usb-tune tool. That helped me at quantifying the distortion back in my
> ASL
> > testing days.YOu kept it running for seconds and the tone broke up
> > intermittently eventually.
> >
> > There's a quite important update on the degraded audio issue. I continued
> > my controlled manner testing by disabling things one by one.
> Specifically I
> > had a script checking gpio to sense loss of mains power - killing it
> > doesn't change anything. I eventually tried a reboot which fixed the
> > problem immediately. But the issue come back in the same form less than
> 24
> > hours later. Users reported this thing gets worse over time. Another
> reboot
> > fixed it again. I am back doubtful of my power supply, unless you have
> > other ideas. Am I wrong thinking 3 ports could be too many for a single
> PI
> > 3B?
> >
> > I'll procure some uLAW recordings as soon as I can listen to them. What
> do
> > you reckon to play the uLAW files with? I tried  importing them as raw
> > files with audacity with no luck.Maybe I am configuring it wrongly during
> > the import.
> >
> > Thanks,
> > Alessio
> >
> > On Thu, Sep 12, 2019 at 5:46 PM "Danny K5CG via ARM-allstar" <
> > arm-allstar at hamvoip.org> wrote:
> >
> > > Alessio,
> > >
> > > It sounds like you need to do some testing in a controlled manner to
> > > eliminate as many unknowns as possible.
> > >
> > > Do you have a service monitor? Generate input RF, add a tone, record
> it.
> > > Is the distortion still there?
> > >
> > > Danny
> > > K5CG
> > >
> > > ----- Original Message -----
> > > From: "ARM Allstar" <arm-allstar at hamvoip.org>
> > > To: "ARM Allstar" <arm-allstar at hamvoip.org>
> > > Cc: "Alessio Sacchi" <iz4efn at gmail.com>
> > > Sent: Thursday, September 12, 2019 9:55:51 AM
> > > Subject: Re: [arm-allstar] Distorted audio (sampling?)
> > >
> > > Hi David, thanks. I will immediately begin recording with uLAW and
> find a
> > > few samples to share.
> > >
> > > >>is the same noise heard on all your AllStar connected receivers or
> just
> > > one?
> > > All connected receivers. To clarify:
> > > - A distorsion over a signal coming from the 50MHz port is heard on
> > > echolink, on 70cm and on 23cm
> > > - Distorsion can happen regardless of the input ports - except for
> audio
> > > coming from echolink. Meaning that signals coming from each of the
> radio
> > > ports can be affected by distorsion. Audio from echolink seems to be
> pushed
> > > out clean at all times.
> > >
> > > Alessio
> > >
> > > On Thu, Sep 12, 2019 at 4:01 PM "David McGough via ARM-allstar" <
> > > arm-allstar at hamvoip.org> wrote:
> > >
> > > >
> > > > BTW, I noticed that the dropbox .wav files are in the GSM CODEC
> format.
> > > > For diagnosing audio issues, I recommed saving the files using the
> much
> > > > higher audio quality uLAW CODEC, rather than GSM. The negative
> drawback
> > > is
> > > > that the files will be bigger, of course.
> > > >
> > > > To enable saving uLAW formatted files, in your /etc/asterisk/rpt.conf
> > > file
> > > > node stanzas, add:
> > > >
> > > > archivetype=pcm
> > > >
> > > >
> > > > 73, David KB4FXC
> > > >
> > > >
> > > > On Thu, 12 Sep 2019, "David McGough via ARM-allstar" wrote:
> > > >
> > > > >
> > > > > Hi Alessio,
> > > > >
> > > > > To me, the distortion heard in your recordings doesn't sound it's
> > > coming
> > > > > from the HamVoIP/AllStar software. My first suspicion is noise on
> the
> > > > > receiver audio, which leads me to a question: is the same noise
> heard
> > > > > on all your AllStar connected receivers or just one?
> > > > >
> > > > >
> > > > > 73, David KB4FXC
> > > > >
> > > > >
> > > > >
> > > >
> > > > _______________________________________________
> > > >
> > > > ARM-allstar mailing list
> > > > ARM-allstar at hamvoip.org
> > > > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> > > >
> > > > Visit the BBB and RPi2/3 web page - http://hamvoip.org
> > > >
> > > _______________________________________________
> > >
> > > ARM-allstar mailing list
> > > ARM-allstar at hamvoip.org
> > > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> > >
> > > Visit the BBB and RPi2/3 web page - http://hamvoip.org
> > > _______________________________________________
> > >
> > > ARM-allstar mailing list
> > > ARM-allstar at hamvoip.org
> > > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> > >
> > > Visit the BBB and RPi2/3 web page - http://hamvoip.org
> > >
> > _______________________________________________
> >
> > ARM-allstar mailing list
> > ARM-allstar at hamvoip.org
> > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> >
> > Visit the BBB and RPi2/3 web page - http://hamvoip.org
> >
>
>