Bug#1004955: Wish: switch to new version of soundmodem

[Alan Crosswell <alan@crosswell.us>]

I’m a bit confused what the purpose of using gtk is beyond the graphical scope etc interface. It’s not pretty but it works….

Using external measurement is fine for TX level adjustment but for RX level you need to see the waveform coming in to soundmodem to make sure the audio isn’t over or under driven. 

On Sun, Oct 30, 2022 at 7:07 AM Roland Schwarz <roland.schwarz@blackspace.at> wrote:

Hi Alan,

Am 30.10.22 um 11:38 schrieb Alan Crosswell:
> I use the scope display to set correct audio levels.

true, some tool for level setting is needed. I was successful using

     arecord -D <device> -V stereo -f S16_LE -c 2 -r 48000 /dev/null

to display the received level and

     AUDIODEV=<device> play -n synth sine 1000 gain 0

to send a reference sine to output.

Given, that the level has to be set external to soundmodem (physical
knobs or alsamixer) I believe measuring the levels externally as well is
not a too bad idea. What do you think?

On the other hand I might consider (re) writing some level setting
helpers if you can give me detailed instructions of how you think this
should work. I was not really satisfied with the graphics present in the
GTK2 version of soundmodem.

I believe the best approach would be to use the besselnull method, but
then you will need a different receiver since a FM receiver cannot be
used for this method.

vy 73 roland

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