[arm-allstar] How to adjust the audio characteristics for both TX and RX?

[Doug Crompton]

Irv,

 Pre and de-emphasis is a fixed equalization designed around FM
communications standards. You cannot nor should you change that. Also using
pre or de-emphasis just to tailor audio is not a good idea. It should be
set correctly for the radio you  are using. There is currently no
equalization capability in Allstar within its self it is basically flat. In
the future there may be a way to do equalization in the IOpipe channel
driver. If you have a circuit, transceiver etc. that has poor audio
characteristics it is best to try and fix that rather than trying to
correct it with SW. The other issue is every radio would have different
characteristics and if you have a node that has multiple users you would
just be chasing your tail trying to get things right for each user or radio.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*


On Fri, Nov 24, 2017 at 1:45 AM, "Irvin Fontanes via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> Hello everyone, I would like to reshape the rx and tx audio characteristics
> of my nodes similar to how the preemphasis=yes or no and deemphasis=yes or
> no variables allow us to do in the simple tune menu application.
>
> How can I change or play around with how much the audio changes when
> preemphasis and deemphasis is set to yes?
>
> I started researching in the asterisk groups and read that the function
> pitch_shift allows the user to raise the pitch of a call. I have no idea
> how to implement that function.
>
> Happy Thanksgiving!
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