using a LIMITER for mumble output to prevent EAR SPLITTING full volume audio output spikes

[Chuck Vaughn]

if you listen to MUMBLE OUTPUT via HEADPHONEs

this might be an  EAR SAVER  

- to use a LIMITER plugin on your mumble output before it goes to your headphones

                     here is a full screenshot of a Pi4 mumble setup using a HARD LIMITER LV2 PLUGIN on mumble output

sending CW at  -14 db audio volume output from the CW KEYBOARD shown(Recri Keyer) into the MUMBLE INPUT, seems to be the highest amount of VOLUME that can be used,  before the MUMBLE internal AGC system kicks in and distorts the CW WAVE SHAPE by squeezing down the volume from start to finish of each CW NOTE...  at -14 db CW audio volume input into the mumble input produces about -11 db volume output on the other mumble clients that are listening...this HARD LIMITER is set to keep the volume output of mumble from passing over -10 db...   otherwise an incoming FULL VOLUME MUMBLE OPUS SPIKE could send the spike over 0 db and even up to +6 db or so...which can be very hard on the ol ears... if you are wearing headphones...   this limiter seemed to do a good job of keeping any spikes to about -10 db max...   

[aa0hw]

Here is another plugin i find quite useful...especially if your are trying to use a CW AUDIO BANDPASS filter 

and need the center FREQ of the CW from the other OP(s)           

                                                                                                                               GxTuner      https://github.com/brummer10/gxtuner

[Chuck Vaughn]

Here is another plugin that works well   as a LIMITER  and this plugin also works as an AGC,

to keep the Mumble output volume the same...no matter if the other OP's sending volume is too low  or too high...

X42's   plugin     DPL

https://x42-plugins.com/x42/x42-limiter

[Chuck Vaughn]

Another useful plugin i like to use,   is a SPECTRUM ANALYZER

...to see what the other OP(s) CW audio spectrum looks like...

...can pick up key clicks, harmonics  et al.   etc...    and take a snap shot

and email it back to them, to show what their mumble setup is putting out...

 

the plugin is called:

    SPECTR

https://x42-plugins.com/x42/x42-spectra

[Chuck Vaughn]

Here is another plugin that seems to work well for cleaning up a CW Sidetone... 

in this video example linked below,   it is a TWIN-T CPO....

  

 the twin-t original SPECTRUM that looks like this

THE CALF FILTER in bandpass mode,  filters the TWIN-T   to look like this

Here is a short video demo... that shows this CALF FILTER in action:

https://youtu.be/fSnO5My_6B0

[S. Steltzer]

And even a Windows version.

[aa0hw]

Here is another PLUGIN that works well filtering a 'rough' sounding TWIN-T CPO

the    GLAME BANDPASS FILTER     LADSPA PLUGIN 

here is a short video demo showing the filter's settings and what it sounds like

https://youtu.be/VUohvO4aLso

[aa0hw]

Here is a more advanced pi4 iCW MUMBLE setup using more plugins and a mixture of different brands of plugins

- all using CARLA PLUGIN HOST  in MULTIPLE CLIENTs MODE

https://youtu.be/-NctiGvxago

[Chuck Vaughn]

Here is another PLUGIN HOST for LADSPA PLUGins

this example uses "JACK RACK"

http://jack-rack.sourceforge.net/

 to host 4 consecutive BP filters to change a square wave CPO 

into a pure sine wave CPO...

 and do it in less than 5 milliseconds

https://youtu.be/M4KdJDqYx2k