[Asterisk-Users] odd 'digital' sound artifacts

Tue Feb 14 08:54:27 MST 2006

Interesting, I seem to have gotten more 'artifact' complaints after
switching to the svn trunk MG2 echo canceler, I just tested with the
echo canceler turned off completely, the artifacts are still there.
I haven't heard the loud buzzing sound since I stopped using the
aggressive canceler.
I've also tested with echocancel=256 per your suggestion to see if I can
reproduce it, the little blips are still there, just heard one after
being on hold for 3 min 30 secs.
but no more loud buzzing :)

I just heard a different artifact, the blip turned into a buzz and the
sound (hold music) coming in repeated itself about 3 times. sorta like
this: "...your call will be answered as *digital sounding
beep*quickl*quickl*quickly as possible...."

Next up I'm going to try a different mainboard with only one TDM card in
it. 

On Mon, 2006-02-13 at 10:40 +1100, Mike Pollitt wrote:
> Hi Gerard --
> 
> I found that I get the really loud buzzing sound in the handset earpiece
> when I set echocancel=256 instead of echocancel=yes (the default = 128
> taps). 
> 
> It seemed to occur irrespective of the actual echo canceller chosen.
> 
> Mike.
> 
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Gerard Saraber
> Sent: Saturday, 11 February 2006 2:04 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] odd 'digital' sound artifacts
> 
> So nobody heard these before? or did I do something stupid that anyone
> should know and nobody wanted to yell at me for it ;)
> 
> On Wed, 2006-02-08 at 12:54 -0600, Gerard Saraber wrote:
> > Hi,
> > I've got some weird sound artifacts happening during calls, they're very
> > hard to describe, so I have a 122kb recording:
> > http://openprojects.rarcoa.com/~miztic/artifact.wav
> > normally the artifacts are just short blips, not quite as long as the
> > one above, but they sound the same.
> > When using the aggressive echo suppressor, it seems like those artifacts
> > cause a really loud buzzing sound to come out of the cisco phone, pretty
> > much made using the aggressive canceler impossible to use, it's too bad
> > because it worked the best out of all of them, mark3 works ok but still
> > gives echos on at least 20% of the calls.
> > 
> > I thought they might be caused by IRQ sharing, so I pulled one of the
> > TDM400P cards out and made sure the remaining two were on their own IRQ,
> > the artifacts were still there. I've also tried running a kernel with
> > all the low-latency stuff turned on, and the same kernel with it all
> > turned off (2.6.16-rc2) doesn't appear to make any difference either.
> > I'm not sure what else to try, any input would be appreciated.
> > 
> > Thanks,
> > Gerard Saraber
> > gsaraber at rarcoa.com
> > 
> > hardware:
> > AMD64 1.8Ghz 512M ram
> > MSI nforce3 socket 754 mainboard
> > 3 Digium TDM400P cards, 10 FXO + 2 FXS modules
> > 
> > /proc/interrupts
> >            CPU0       
> >   0:    2784232    IO-APIC-edge  timer
> >   1:          8    IO-APIC-edge  i8042
> >   8:          0    IO-APIC-edge  rtc
> >   9:          0   IO-APIC-level  acpi
> > 177:      71552   IO-APIC-level  eth0
> > 185:       9412   IO-APIC-level  libata, NVidia CK8S
> > 193:          0   IO-APIC-level  ehci_hcd:usb1
> > 201:          0   IO-APIC-level  ohci_hcd:usb2
> > 209:          0   IO-APIC-level  ohci_hcd:usb3
> > 217:    5577811   IO-APIC-level  wctdm, wctdm
> > 225:    2769262   IO-APIC-level  wctdm
> > 
> > lspci (for completeness):
> > 
> > 02:07.0 Network controller: Tiger Jet Network Inc. Tiger3XX Modem/ISDN
> > interface
> >         Subsystem: Unknown device b119:0001
> >         Flags: bus master, medium devsel, latency 32, IRQ 217
> >         I/O ports at ac00 [size=256]
> >         Memory at fdeff000 (32-bit, non-prefetchable) [size=4K]
> >         Capabilities: [40] Power Management version 2
> > 
> > 02:09.0 Network controller: Tiger Jet Network Inc. Tiger3XX Modem/ISDN
> > interface
> >         Subsystem: Unknown device b119:0001
> >         Flags: bus master, medium devsel, latency 32, IRQ 225
> >         I/O ports at a800 [size=256]
> >         Memory at fdefe000 (32-bit, non-prefetchable) [size=4K]
> >         Capabilities: [40] Power Management version 2
> > 
> > 02:0a.0 Network controller: Tiger Jet Network Inc. Tiger3XX Modem/ISDN
> > interface
> >         Subsystem: Unknown device b119:0001
> >         Flags: bus master, medium devsel, latency 32, IRQ 217
> >         I/O ports at a400 [size=256]
> >         Memory at fdefd000 (32-bit, non-prefetchable) [size=4K]
> >         Capabilities: [40] Power Management version 2
> > 
> > 
> -- 
> Regards,
> Gerard Saraber
> Network Admin, Rarcoa, Inc.
> (630) 654-2580 x11
> gsaraber at rarcoa.com
> 
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-- 
Regards,
Gerard Saraber
Network Admin, Rarcoa, Inc.
(630) 654-2580 x11
gsaraber at rarcoa.com