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<TITLE>Re: [App_rpt-users] Audio Clipping with IAXRPT / Web Transceiver Client</TITLE>
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<FONT FACE="Arial"><SPAN STYLE='font-size:12pt'>Hi Robert<BR>
<BR>
Memory on the system is 1GB ram<BR>
<BR>
When I run free I get -<BR>
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[root@VE3LSR asterisk]# free<BR>
total used free shared buffers cached<BR>
Mem: 1034368 628924 405444 0 185776 289968<BR>
-/+ buffers/cache: 153180 881188<BR>
Swap: 1020116 0 1020116<BR>
[root@VE3LSR asterisk]# <BR>
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The attached drive is a SSD<BR>
<BR>
Clipping can occur randomly – it is not tied to one station. Volume levels on these stations can vary.<BR>
<BR>
We have good bandwidth into out of the site. Co-located with an ISP.<BR>
<BR>
We are using the DMK fobs.<BR>
<BR>
Keith<BR>
<BR>
<BR>
<BR>
On 3/3/13 12:48 PM, "Robert a. Poff" <<a href="wb3awj@comcast.net">wb3awj@comcast.net</a>> wrote:<BR>
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</FONT></SPAN><BLOCKQUOTE><SPAN STYLE='font-size:12pt'><FONT FACE="Arial">Does the clipping occur usually on the same stations?<BR>
Or sort of randomly?<BR>
<BR>
In addition to CPU load, how much free memory do you have?<BR>
I was told that you should have enough memory to not see ANY swapping.<BR>
And found that to be a good rule of thumb.<BR>
The time involved with disk access comes into play.<BR>
<BR>
<BR>
Keith Goobie <<a href="keith@goobie.org">keith@goobie.org</a>> wrote:<BR>
</FONT></SPAN><BLOCKQUOTE><SPAN STYLE='font-size:12pt'><FONT FACE="Arial">Good day All.<BR>
<BR>
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.<BR>
<BR>
On our asterisk system, we support three nodes:<BR>
<BR>
27211 – VE3UOR UHF repeater<BR>
29133 – VE3LSR coupled through a RLC-DSP404 controller (often connected to VE3UPS and VE3UHN), and<BR>
29154 – VA3LSR remote link for VE3LSR into VE3MUS – not too active – ad-hoc RF link.<BR>
<BR>
I have also been testing out iaxrpt and the WebTransceiver clients.<BR>
<BR>
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.<BR>
<BR>
It may be that the system is not powered enough to drive the three uri-fobs. CPU show about 25% busy.<BR>
<FONT COLOR="#0000FE">[root@VE3LSR etc]# cat /proc/cpuinfo<BR>
processor : 0<BR>
vendor_id : GenuineIntel<BR>
cpu family : 15<BR>
model : 4<BR>
model name : Intel(R) Pentium(R) 4 CPU 3.00GHz<BR>
stepping : 3<BR>
cpu MHz : 2992.898<BR>
cache size : 2048 KB<BR>
physical id : 0<BR>
siblings : 2<BR>
core id : 0<BR>
cpu cores : 1<BR>
apicid : 0<BR>
fdiv_bug : no<BR>
hlt_bug : no<BR>
f00f_bug : no<BR>
coma_bug : no<BR>
fpu : yes<BR>
fpu_exception : yes<BR>
cpuid level : 5<BR>
wp : yes<BR>
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<BR>
bogomips : 5985.79<BR>
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We do think that the system is sufficiently powered.<BR>
<BR>
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. <BR>
<BR>
I am listening to other systems – most not to busy, so I am not yet able to get a good reference point.<BR>
<BR>
I have not dabbled with the codecs much, but have been focused on using ulaw. I am also testing with GSM – lower bandwidth.<BR>
<BR>
So as I said before, thoughts or suggestions are welcome.<BR>
<BR>
Keith / VA3YC<BR>
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-- <BR>
<a href="keith@goobie.org">keith@goobie.org</a><BR>
Keith Goobie<BR>
Richmond Hill, ON, CANADA<BR>
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