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VOX Issues to be aware of. Or, suspected new digital mode.

Tom, wb6b
 

Hi,

I don't if many people have added VOX to their uBitx, but here is a reason to be careful. Maybe a DSP VOX controller could be built to guard against accidental digital mode emissions. Kind of like the computer keyboard filters that were supposed to detect and reject keystroke when your cat walks across your keyboard. Wonder how well the narrow CW filters would work with this mode interfering.

Here is a video of a HAM trying to determine what this new digital mode is. 

https://youtu.be/TJSctUv5lUc?t=274

Tom, wb6b

Tom, wb6b
 

On Sat, Aug 17, 2019 at 07:47 PM, Tom, wb6b wrote:
https://youtu.be/TJSctUv5lUc?t=274
Th link did not get linked. Here is the linked link.
https://youtu.be/TJSctUv5lUc?t=274

bobolink
 

Tom,
lol
Snoring as a digital mode! I wonder if your brain in encoding some diagnostic information on the snore? Research funding?

I wonder if the voiced/unvoiced decision could be ripped from CODEC2? Maybe for a syllabic squelch for an hf receiver but probably too slow for a Vox on tx.

bob
wm6h
 

Tom, wb6b
 

On Sun, Aug 18, 2019 at 05:33 AM, bobolink wrote:
ripped from CODEC2
CODEC2 looks interesting. It seems to be a breath new life for older research and makes it work well thanks to modern DSP technology. The original researchers could not get past a certain technology point.

Well unless you have a government sized budget. 
https://commons.wikimedia.org/wiki/File:SIGSALY.jpg

If you think learning Morse Code is hard, imagine learning this keyboard. Maybe someone should come up with a Vocoder Code Tutor. Must have the lowest bit rate for any digital voice mode.
https://encyclotronic.com/synthesizers/misc-instruments/vocoder-r1258/

Probably could send voice at WSPR bit rates. Imagine that, voice WSPRing.

Looks like FreeDV (based on CODEC2) can be implemented with one of the more powerful STM32 processors, maybe one of the newer Teensy boards. Might be fun to add digital voice to the uBitx.
https://freedv.org

Well, if the snoring VOX issue cannot be solved, maybe just some kind of auto ID every 10 minutes to keep his transmissions legal.

Tom, wb6b