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

[Justin Reed]

Basically he’s trying to fix the crap-tastic IDAS audio by jacking around with Allstar.

Justin
NV8Q

Sent from my iPhone

> On Nov 30, 2017, at 1:02 PM, Doug Crompton via arm-allstar <arm-allstar at hamvoip.org> wrote:
> 
> Irvin,
> 
>  Not sure what you  mean by "what script is called out" ?  The
> pre/deemphasis routines are fixed and not available for the user to change.
> There is no other way at this time to equalize within the Allstar code. You
> either turn the pre/deemphasis on or off in simpleusb-tune-menu.
> 
> The in vs. out of Allstar should be flat assuming you have the emphasis set
> correctly. If that is not the case then there is something wrong external
> to Allstar. The Allstar codecs especially G726 and ulaw are very good
> quality and probably better than any radio would be. I am not sure if that
> answers your question but I am also not sure what you are trying to
> accomplish.
> 
> 
> *73 Doug*
> 
> *WA3DSP*
> 
> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> 
> 
> On Thu, Nov 30, 2017 at 1:34 PM, "Irvin Fontanes via arm-allstar" <
> arm-allstar at hamvoip.org> wrote:
> 
>> 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
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