soundmodem bit rot prevention

soundmodem bit rot prevention

[Roland Schwarz]

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To all who care,

I gave the soundmodem some love to save it from bit rot. I know the most 
important problem is dependency on legacy gtk2. However, this is not 
resolved yet. I am working on a solution.

I have fixed the warnings and some issues which were found by clang 
tidy. I also have added systemd support and started improving the docs
by filling the README file with text.

Most importantly (for me) is the addition of BLR (baseline restoration) 
to the 9600Bd modem. This addition allowed me to use a Yaesu FTM-400XD 
with 9600Bd which simply did not work without BLR at all. I expect other
transceivers to benefit from this addition as well. I would be very 
interested of your findings.

The code is also on gitlab near Thomas Sailers repo:

https://gitlab.com/packetradio/soundmodem

vy 73 de Roland, oe1rsa


-- 
__________________________________________
   _  _  | Roland Schwarz
  |_)(_  |
  | \__) | mailto:roland.schwarz@blackspace.at
________| http://www.blackspace.at

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Re: soundmodem bit rot prevention

[Dave Hibberd]

Hey there,

Great work, thanks for taking this on and thank you for caring!

I possibly can't test BLR as I'm not wholly sure what it is and what use it would be on my test rigs (FT-7900, FT-100D) - what's the benefit of the feature? 

I'm keeping track of this, when you get to GTK-3 relative stability, we can think about migrating the soundmodem debian package to the codebase :)

Cheers,

-- 
  Hibby
  MM0RFN

On Sun, 28 Nov 2021, at 5:22 PM, Roland Schwarz wrote:
> To all who care,
>
> I gave the soundmodem some love to save it from bit rot. I know the most 
> important problem is dependency on legacy gtk2. However, this is not 
> resolved yet. I am working on a solution.
>
> I have fixed the warnings and some issues which were found by clang 
> tidy. I also have added systemd support and started improving the docs
> by filling the README file with text.
>
> Most importantly (for me) is the addition of BLR (baseline restoration) 
> to the 9600Bd modem. This addition allowed me to use a Yaesu FTM-400XD 
> with 9600Bd which simply did not work without BLR at all. I expect other
> transceivers to benefit from this addition as well. I would be very 
> interested of your findings.
>
> The code is also on gitlab near Thomas Sailers repo:
>
> https://gitlab.com/packetradio/soundmodem
>
> vy 73 de Roland, oe1rsa
>
>
> -- 
> __________________________________________
>    _  _  | Roland Schwarz
>   |_)(_  |
>   | \__) | mailto:roland.schwarz@blackspace.at
> ________| http://www.blackspace.at
>
> Attachments:
> * OpenPGP_signature

Re: soundmodem bit rot prevention

[Roland Schwarz]

On 29.11.21 at 12:59 Dave Hibberd wrote:
> ... what's the benefit of the feature?

The idea is to improve 9600 Bd operation for transceivers that have a 
bad low frequency response. The BLR should not get in your way if the 
transceiver already shows good performance.

Put it another way: You should see improvement on some equipment but no 
degradation on any.

Roland

-- 
__________________________________________
   _  _  | Roland Schwarz
  |_)(_  |
  | \__) | mailto:roland.schwarz@blackspace.at
________| http://www.blackspace.at