asterisk users - Mar 2015 - how asterisk detects silence?

Hello!

As I see there is  dsp_drop_silence switch in confbridge.
Could you tell me how asterisk detects silence?
Is it possible to change silence level,
so, let's say some not loud enough background noises will be recognized 
as silence
and only loud enough human voice will be recognized as sound?

Thank you!

19.03.2015 09:31, Dmitry Melekhov ?????:
> Hello!
>
> As I see there is  dsp_drop_silence switch in confbridge.
> Could you tell me how asterisk detects silence?
> Is it possible to change silence level,
> so, let's say some not loud enough background noises will be 
> recognized as silence
> and only loud enough human voice will be recognized as sound?
>
> Thank you!
>
>
>
Hello!

Nobody knows? :-(

On Mon, Mar 23, 2015 at 12:25 AM, Dmitry Melekhov <dm at belkam.com>
wrote:
> 19.03.2015 09:31, Dmitry Melekhov ?????:
>>
>> Hello!
>>
>> As I see there is  dsp_drop_silence switch in confbridge.
>> Could you tell me how asterisk detects silence?
>> Is it possible to change silence level,
>> so, let's say some not loud enough background noises will be
recognized as
>> silence
>> and only loud enough human voice will be recognized as sound?
>>
>> Thank you!
>>
Asterisk passes received voice data, converted to signed linear,
through a DSP. The DSP looks at the energy level in the data and, if
it is above a certain value, categorizes the data as 'silence' or
'talking'.

You can tweak the periods necessary for Asterisk to decide if someone
is talking or silent using the 'dsp_silence_threshold' and
'dsp_talking_threshold' settings:

https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Configuration_app_confbridge

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