[Asterisk-Users] odd 'digital' sound artifacts

[Mike Pollitt]

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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