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

[Irvin Fontanes]

Doug,

This is a private node. Just me as a user. It is used as follows:

-Rpi 3 connected to an arcom rc-210 on port 2
-icom fr-6000 on port 1 running idas 6.25 khz bw

The setup is configured so that I talk into the fr6000 with an icom
ic-f4261dt and it gets piped (in analog from the back of the db25) out to
my other private node.

I know that the audio quality takes a toll when digitized and there's
nothing I can do about it; however; I'd like to experiment with whatever
code/script is called out when preemphasis=yes or no and deemphasis=yes or
no is selected since when the audio gets converted back to analog (out of
the fr6000's db25) it is missing some of the"highs".

So, could someone tell me which script is called out when preemphasis=yes
or no and deemphasis=yes or no is selected? I would seriously like to
experiment.

Thanks,
Irvin

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