Re: [OpenSIPStack] Silence Detection

[Ilian J. C. P. <ip...@so...>]

Whit Thiele wrote:
> Hey Ilian,
>   
Hi Whit,
> Thanks for exposing these methods in ATLSIP!
>
> Has there been any more work on the adaptive Silence Detection? The
> threshold of 3 is pretty stable, but I have end-users who complain that all
> calls are extremely 'one-sided' meaning that once one side of the call
> begins talking, the other person can't easily interrupt them. Logically that
> makes sense, but the end users I have love to interrupt each other so its
> rather annoying for them to wait till the other person is finished. 
>   
I'm sorry I haven't had time to dig into the adaptive silence detection 
bug further. I'm currently busy with some other aspect of the softphone. 
But I promise I'll look into this closely in the near future.

Btw last time I checked, OpalSilenceDetector::ReceivedPacket(..) was the 
culprit.  You might want to take a look in that function if you have time.

Regards,
Ilian
> Has anyone else deployed ATLSIP to real world end users?
>
> If so, what has your experience been like? I'd love to see what kind of
> settings (Silence, CN etc) others are using in the field.
>
>
> Regards,
> Whit
>
>
>
>
>
> -----Original Message-----
> From: ope...@li...
> [mailto:ope...@li...] On Behalf Of Ilian
> Jeri C. Pinzon
> Sent: Friday, June 29, 2007 6:58 AM
> To: ope...@li...
> Subject: Re: [OpenSIPStack] Problem with OnOutgoingCallConnected
>
> The attachment was not sent. Probably filtered by the server. Anyway, here
> it is:
>
> ===========================================================================
>
> Hi all,
>
> I have exposed the setting of silence detection mode and audio jitter 
> delay in ATLSIP and SoftPhoneInterface.
>
> Here are the methods:
>
> DisableSilenceDetection()
> - Disables silence detection. Disables CNG as well.
>
> EnableFixedSilenceDetection( ULONG threshold )
> - Enables fixed silence detection. Any sound level below the threshold 
> is treated as silence (and CN is generated as a result). Don't use too 
> high threshold values or you'll only hear comfort noise. Try threshold=3 
> as suggested by Whit in another thread.
>
> EnableFixedSilenceDetectionEx( ULONG threshold , ULONG signalDeadband, 
> ULONG silenceDeadband  )
> - An extended version of the previous method. Don't tinker with this 
> unless you know what you're doing. For reference on how signalDeadband 
> and silenceDeadband are used, look in OpalSilenceDetector::ReceivedPacket().
>
> EnableAdaptiveSilenceDetection( ULONG adaptivePeriod )
> - Enables an adaptive silence detection. Supposedly this enables the 
> threshold to *adapt* to the current sound level every adaptivePeriod 
> milliseconds. However, its silence detection doesn't seem to be very 
> effective (at least in my machine). I'll look into this further to see 
> what's wrong. This mode with adaptivePeriod=4800 is the default mode for 
> ATLSIP.
>
> EnableAdaptiveSilenceDetectionEx( ULONG adaptivePeriod, ULONG 
> signalDeadband, ULONG silenceDeadband  )
> - An extended version of the previous method. Don't tinker with this 
> unless you know what you're doing. For reference on how signalDeadband 
> and silenceDeadband are used, look in OpalSilenceDetector::ReceivedPacket().
>
> SetAudioJitterDelay( ULONG minDelay, ULONG maxDelay )
> - Sets audio jitter delay settings.
>
>
> Regards,
> Ilian
>
>
>
> Ilian Jeri C. Pinzon wrote:
>   
>> ATLSIP's default silence detection is still faulty. You can try 
>> setting the silence detection to fixed mode. Somebody said in another 
>> thread that a threshold of 3 will do the trick. You may have to tweak 
>> this value though.
>>
>> Attached is the thread containing the functions to call for setting 
>> the silence detection mode.
>>
>> - Ilian
>>
>> tomach wrote:
>>     
>>> Hello!
>>>
>>> Ok thank you very much! Till now everythign works correct :) Now some 
>>> more advanced test...about quality of voice etc...
>>>
>>> It started to work correctly (From Tag was ok) after I build it as 
>>> debug and reregistered again :) Now everythign works correct:)
>>>
>>> I still have like last question, do you have comfort noise generator? 
>>> Because now its totally silence if somoebdy do not talk at all... and 
>>> it could be uncomcofortable for subscirbers...
>>>
>>> Best Regards,
>>> Tom
>>>
>>>       
>
>
>
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