22h ago

Another question about subtracting audio files from each other

A: Gaussian noise

B: Signal Tones

C: Gaussian noise with 'tone holes'

How can i create holes in gaussian noise?

I have a track with gaussian noise and a track with a tone signal, i want to take the 'negative" of the tone track. Picture C describes how i imagine it would look.

13 comments

Make two identical copies of gausian noise track
Set one phase inverted and combine both tracks output in a bus/another track, they should cancel each other into silence.
Send the tone track (preferably inverted) into the bus aswell so now it has 3 inputs,
Add in another tone track that is phase inverted/opposite from step 3 and mixes together with step 3s output
Now, where the fun comes in... what happens when you add fx to different parts of the signal chain so these cancellations become imperfectly dynamic and evolving. What happens when the signals cancelling have compressors with different attack and release settings? What happens when you throw a transient designer like elysia nvelope on different stages of this signal chain?
This kind of effect isn't too unlike a basic guitar pedal comb filter just a lot more unhinged.
- i tryed as you said but the result was just silence, what am i doing wrong?
  
  Yeah, you need a gate when adding in the inversed/phase shifted tone so that it only sends signal when their is signal to cancel, but that is a frequency dependent question too..
  
  guess it cant be done
  
  That's silly. We just haven't figured out how to get it to work for you.
  
  i feel maybe i should just try to convert the audio into some fft file and then see if i can somehow invert the values in that file with a script
  
  That's an interesting thought. I'm useless when it comes to scripting but it's interesting to me.
  I've got some free time over the next couple hours, I'll see what I can come up with.
  Out of curiosity, what kinda project you working on?
  
  The project is to invert the MFSK-64 protocol, its used to send text over Ham radio (in this case i generate the tones with Fldigi). I want to make a fusion between data and music. But the tones itself would be rather annoying to listen to, so my idea was to send "sound holes" where the tones would be, and then to decode holes instead of tones. This would allow me to use any music i want, and just encode the data into the holes, a song missing a few frequency's here and there is still listnable.
  
  Very neat! I dig it, that's a fun project.
  I've reinstalled Reaper, I gotta basically completely re-learn it before I can do much. I used Ableton and Reason mostly, again, like 15+ years ago. But it's definitely doable with the right setup of notch filters and gates
  
  I think it could be done, just a matter of time and tools.
  I have tryed this tool here https://nsspot.herokuapp.com/imagetoaudio/ when take a picture of the waterfall display, then invert it with krita and send it thru the converter a second time. Problem is that is rather crude, it makes the pixels in wich i can take the screenshot the bottle neck and the results are not fine enough for musik.
  Have fun with reaper, i am a total audio noob so i have been playing with it for a few days but still discover new stuff constantly :D

13 comments