[Blink] Noise on G.722 calls only with Blink

Adrian Georgescu ag at ag-projects.com
Mon Jul 1 16:55:26 CEST 2013


Hi Jeff,

Thanks for the feedback. I am glad is not an issue we have to fix. Next release of Blink Pro changelog is here, there will be some audible changes.

http://icanblink.com/changelog-pro.phtml

Adrian

On Jul 1, 2013, at 4:49 PM, Jeff Pyle <jpyle at fidelityvoice.com> wrote:

> I've run some tests.  I think what we have here is the combination of mic gain a little higher than it needs to be, receiver volume a little louder than it needs to be, a USB dongle on this Sennheiser PC 151 headset that isn't completely quiet, and listeners I have trained well.  :)   Add all that up through a codec that tends to be a little raspy in the high frequencies and the result is nondescript "noise".
> 
> I ran the tests against Polycom 450s, 560s and 650s all running 4.0.4 software, a Freeswitch conference bridge, and a remote Blink Pro instance.  Results were consistent across all platforms.
> 
> Bria's implementation of G.722 sounds different, and in my opinion, not as clean overall as Blink / PJMEDIA's.  Blink's does seem to be slightly more susceptible to noise of this sort.  Still, the overall quality of voiced portions seemed much cleaner than Bria's.  With all the levels now more properly adjusted I'm quite satisfied with how Blink sounds.
> 
> Sometimes it's amazing what good data will show.  I'd call this a closed case.
> 
> Like MCG, I'm looking forward to OPUS and any other codecs that may be coming soon!
> 
> 
> - Jeff
> 
> 
> 
> 
> On Tue, Jun 25, 2013 at 5:32 PM, Adrian Georgescu <ag at ag-projects.com> wrote:
> 
> On Jun 25, 2013, at 11:25 PM, Jeff Pyle <jpyle at fidelityvoice.com> wrote:
> 
>> I've tested with several.  Polycom X50 series (450, 550, 650, etc) on 3.2 and 4.0 software, Polycom VVX series on 4.0 and 4.1 software, and other soft phones such as Blink Pro, Bria, etc.
> 
>> This was very subjective testing over a long period of time, including several versions of Blink.
> 
> We have not made any changes to the G722 codec since 2010 so the version is irrelevant.
> 
>>  Let me approach it more systematically to get more specific results.  Updates to follow.
>> 
> 
> Sure, let us know.
> 
>> 
>> - Jeff
>> 
>> 
>> On Tue, Jun 25, 2013 at 5:15 PM, Adrian Georgescu <ag at ag-projects.com> wrote:
>> Blink uses PJMEDIA library and codecs, which are built nowadays into many SIP apps including Asterisk and Bria itself. I have not heard about any interop issues for several years now.  Yet it could be an interoperability issue between the codec implementations.  What runs into the other end-point?
>> 
>> Adrian
>> 
>> On Jun 25, 2013, at 11:06 PM, Jeff Pyle <jpyle at fidelityvoice.com> wrote:
>> 
>> > Hello,
>> >
>> > This is strange.
>> >
>> > I have both Blink Pro and Bria installed on this iMac, along with some other non-SIP VoIP applications.  When I'm on a G.722 call in Blink Pro I'm told the other side hears a pink/white style background noise from me.  If I establish the same call over Bria using G.722, no noise.  The other non-SIP applications with codecs at least the quality of G.722 show no problem either.  With a call on Blink Pro using another codec, say G.711u, no noise.
>> >
>> > I use a Sennheiser USB headset with all applications.  It has an ON/OFF switch that physically disconnects the microphone from the signal path.  If I flip it to OFF during a G.722 Blink Pro, all audio stops, including the noise.  Hmm.
>> >
>> > To the best of my ability all echo canceling and other audio processing is disabled in all applications.  The TX audio level is as close as possible in all applications.  And even though the mic switch seems to indicate Blink itself is not generating the noise, it's the only "noisy" application.  Weird.
>> >
>> > I strongly prefer Blink over Bria, but I can't use it if it's noisy.  I'm not sure where to go from here.  Any suggestions are welcomed.
>> >
>> >
>> > Thanks,
>> > Jeff
>> >
>> > _______________________________________________
>> > Blink mailing list
>> > Blink at lists.ag-projects.com
>> > http://lists.ag-projects.com/mailman/listinfo/blink
>> 
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>> 
>> 
>> -- 
>> Jeff Pyle <jpyle at fidelityvoice.com>
>> Director, Voice Engineering
>> Fidelity Voice and Data
>> 216-245-4106
>> www.fidelityvoice.com
>> 
>> _______________________________________________
>> Blink mailing list
>> Blink at lists.ag-projects.com
>> http://lists.ag-projects.com/mailman/listinfo/blink
> 
> 
> _______________________________________________
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> Blink at lists.ag-projects.com
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> 
> 
> 
> 
> -- 
> Jeff Pyle <jpyle at fidelityvoice.com>
> Director, Voice Engineering
> Fidelity Voice and Data
> 216-245-4106
> www.fidelityvoice.com
> 
> _______________________________________________
> Blink mailing list
> Blink at lists.ag-projects.com
> http://lists.ag-projects.com/mailman/listinfo/blink

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