[App_rpt-users] on board audio

[Ken]

Hmmm

Well - everybody using the Web Transceiver (and iaxRpt) is using on-board
audio aren't they?

I have heard some very nice web transceiver audio (and some crappy audio).
A lot has to do with the microphone being used - and of course the level
must be set right.

The reason Echolink generally sounds like a bad cell phone call is that they
use the same codec - GSM whereas Asterisk (including the web transceiver)
uses ulaw - or at least you can configure it for that.
see
http://ohnosec.org/drupal/node/80

On top of that, the Echolink coding is converted from GSM to whatever you
are using on Asterisk between nodes (ulaw or g726). Passing a voice through
two different coding schemes will do double-damage to it. 

ulaw provide a much nicer sound at the expense of more bandwidth - more than
twice the bandwidth of GSM. But over a standard internet connection, that is
rarely an issue these days.

73

Ken


> -----Original Message-----
> From: app_rpt-users-bounces at ohnosec.org [mailto:app_rpt-users-
> bounces at ohnosec.org] On Behalf Of Bob Brown - WØNQX
> Sent: Monday, December 26, 2011 8:34 AM
> To: app_rpt-users at ohnosec.org
> Subject: Re: [App_rpt-users] Limey Linux on a HP T5630 Thin Client
> 
> Hence the reason why we use the the Allstar method of VOIP and the USB
> device for audio ,
> 
> Do you really pay attention to how a lot of the Echolink stations
> sound?
> 
> most use on-board audio , and it sucks, don't get me wrong there are
> some fine sounding Echolink
> 
> systems out there,  that is because they used a service monitor and set
> it up right.
> 
> But most use the "By Ear Method" and on-board audio they are all over
> the place.
> 
>