[App_rpt-users] Audio Clipping with IAXRPT / Web Transceiver Client

[Keith Goobie]

Hi Jon

Just checked the configs -

All three appearances (we control three URI fobs) of txlinonly are commented
out, do you know what the default is.

Incoming audio from iaxrpt users seems OK, with no issues.

Keith

On 3/3/13 11:41 AM, "REDBUTTON_CTRL" <jrorke at cogeco.ca> wrote:

>    Hi Kieth, In the usbradio.conf  have you got the "txlinonly = yes'?
>  
>  This should limit TX audio coming from the URI.
>  
>  txlimonly=yes        ; Audio limiting with no pre-emphasis on output channel:
> no,yes
>              ; no - Audio is not limited.
>              ; yes - Audio is  limited.
>              ; Suitable for transmitters with no limiting but with
> pre-emphasis.
>  
>  You can also tell the IAX users to cut back their mic gains. I would start
> here first. Like a lot of people on Echolink they dont have the computer set
> up properly. I find that head sets sound the best rather than using the
> internal mics on lapatops.
>  
>  I would leave the codec as Ulaw. dont bother with GSM, has crappy watery
> audio.
>  
>  Jon VA3RQ
>  
>  On 3/3/2013 11:31 AM, Keith Goobie wrote:
>>  Audio Clipping with IAXRPT / Web Transceiver Client Good day All.
>>  
>>  We have had our node up at VE3LSR / VE3UOR for a few months and we all have
>> learned a lot about configuration and operation.  It is ACID install and
>> version id is 300.3.
>>  
>>  On our asterisk system, we support three nodes:
>>  
>>  27211 ­ VE3UOR UHF repeater
>>  29133 ­ VE3LSR coupled through a RLC-DSP404 controller (often connected to
>> VE3UPS and VE3UHN), and
>>  29154 ­ VA3LSR remote link for VE3LSR into VE3MUS ­ not too active ­ ad-hoc
>> RF link.
>>  
>>  I have also been testing out iaxrpt and the WebTransceiver clients.
>>  
>>  I am on these systems and the results have been promising.  I do notice some
>> clipping on the audio on some stations.  Initially I thought it was amplitude
>> related ­ over-driving the URI-FOB, but I am now beginning to suspect that it
>> may be network related and in my research I hear the term jitter being used ­
>> which if activated, adjust operation on the receiving end only.
>>  
>>  It may be that the system is not powered enough to drive the three uri-fobs.
>> CPU show about 25% busy.
>>  [root at VE3LSR etc]# cat /proc/cpuinfo
>>  processor    : 0
>>  vendor_id    : GenuineIntel
>>  cpu family    : 15
>>  model        : 4
>>  model name    : Intel(R) Pentium(R) 4 CPU 3.00GHz
>>  stepping    : 3
>>  cpu MHz        : 2992.898
>>  cache size    : 2048 KB
>>  physical id    : 0
>>  siblings    : 2
>>  core id        : 0
>>  cpu cores    : 1
>>  apicid        : 0
>>  fdiv_bug    : no
>>  hlt_bug        : no
>>  f00f_bug    : no
>>  coma_bug    : no
>>  fpu        : yes
>>  fpu_exception    : yes
>>  cpuid level    : 5
>>  wp        : yes
>>  flags        : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat
>> pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc pni
>> monitor ds_cpl est cid cx16 xtpr
>>  bogomips    : 5985.79
>>  
>>  We do think that the system is sufficiently powered.
>>  
>>  We are looking for comments & guidance.  Are we expecting too much from the
>> system having three fobs connected?  We do have good bandwidth into and out
>> of the site.  
>>  
>>  I am listening to other systems ­ most not to busy, so I am not yet able to
>> get a good reference point.
>>  
>>  I have not dabbled with the codecs much, but have been focused on using
>> ulaw.  I am also testing with GSM ­ lower bandwidth.
>>  
>>  So as I said before, thoughts or suggestions are welcome.
>>  
>>  Keith / VA3YC
>>  -- 
>>  keith at goobie.org
>>  Keith Goobie
>>  Richmond Hill, ON, CANADA
>>   
>>   
>>  
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>>  
>  
> 
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-- 
keith at goobie.org
Keith Goobie
Richmond Hill, ON, CANADA

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