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Re: [Linphone-users] audio jitters on Linphone Android


From: Robert Rawlinson
Subject: Re: [Linphone-users] audio jitters on Linphone Android
Date: Fri, 25 May 2012 10:04:51 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120421 Thunderbird/12.0

On 05/25/2012 09:52 AM, Liviu Andronic wrote:
> Hello
> 
> 
> On Fri, 25 May 2012 13:52:52 +0200, Dragos D <address@hidden> wrote:
> 
>> Hi, I am not sure what you mean by jitter. Do you mean discontinuities
>> when
>> hearing the other party, or the way they hear you?
>>
> Well, for now I've only tested using the iptel.org 'music' and 'echo'
> services. Currently using 'GSM' codec and 3G.
> 
> When testing 'music', especially in the first ~10sec, I get intermittent
> scratching noises inserted. (Analogous to electrical discharges? Or
> perhaps to ancient vinyl discs?) I'm not sure how else to describe them.
> I don't get them in MizuDroid.
> 
> I'm wondering though if that's due to the complexity of the stream in
> 'music'. I've tested also with 'echo', talking like a fool to myself,
> and I no longer get these jitters. So maybe this is all a false alarm.
> 
> 
>> Could you use headphones and disable both the echo limiter and the echo
>> cancellation and let me know how it behaves?
>>
> I've disabled both and plugged in decent headphones: I still get the
> jitters in 'music'. And seemingly no issues with 'echo'.
> 
> 
> Two questions: Is 'GSM' the code that I should prefer (as in: the
> optimal codec) for 3G? And is it possible to record SIP calls? I can use
> 'vrecorder' to record regular phone calls, but I'm not sure how I could
> do this for Linphone or MizuDroid.
> 
> Cheers
> Liviu
> 
> _______________________________________________
> Linphone-users mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/linphone-users
> 
If you are using DSL you may get that if the filter is poor. I had that
problem for a heart pacer tests. I could not use home phone for it but
voip worked well.
Bob R



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