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   iced depresso (icedquinn@blob.cat)'s status on Friday, 11-Apr-2025 04:25:56 JST iced depresso
   wonder how noise cancel shit actually works
   
   do they just have a lab with a dummy and they run some big ML model to compute how to cancel all the sound
   • Embed this notice
     casey is remote (realcaseyrollins@noauthority.social)'s status on Friday, 11-Apr-2025 05:19:08 JST casey is remote

     in reply to

     @icedquinn Nowadays it's #AI

     In the olden days the only way to do noise cancelling as we view it today would be to have an exact sample of what you want to remove and invert it as inversion of audio waves creates silence. As tech got better, #AI could remove sounds similar to the sample you've provided, and nowadays you can use an #ML trained on a whole bunch of media that can remove stuff like vocals or music as needed

     I use this on occasion: https://vocalremover.org/

   • Embed this notice
     iced depresso (icedquinn@blob.cat)'s status on Friday, 11-Apr-2025 05:19:08 JST iced depresso

     in reply to

     • casey is remote
     @realcaseyrollins for microphones yeah. they asked people to go around with different mics and record ambient noise, then randomly overlaid it on studio recordings, that's how RNNoise and such was made.
     
     DeepFilterNet is stronger but a looot slower. I used that on my commercial audiobook productions.
     
     but i mean active hearing protection. it's a little harder since you have to calibrate the sound coming out of your drivers, which means like, you have to build a little silicone head or something to put good reference microphones on and then like
     
     yeah
   • Embed this notice
     iced depresso (icedquinn@blob.cat)'s status on Friday, 11-Apr-2025 05:30:45 JST iced depresso

     in reply to

     • Password Man
     @mac_ack yea but you probably have to do slightly more than that idk
   • Embed this notice
     Password Man (mac_ack@hidamari.apartments)'s status on Friday, 11-Apr-2025 05:30:46 JST Password Man

     in reply to
     @icedquinn they record ambient noise and play it back inverted
   • Embed this notice
     iced depresso (icedquinn@blob.cat)'s status on Friday, 11-Apr-2025 06:02:14 JST iced depresso

     in reply to

     • Miander
     @mian i think i would just do it the way i was thinking where you make a reference lab box and just let the computer evolve or crunch something
   • Embed this notice
     Miander (mian@mstdn.social)'s status on Friday, 11-Apr-2025 06:02:15 JST Miander

     in reply to

     @icedquinn
     the clever part is that the cost function is just the energy of the sound inside the headphones and the input is the ambient noise. Since the filter doesn't know the recording it can't cancel it.

   • Embed this notice
     Miander (mian@mstdn.social)'s status on Friday, 11-Apr-2025 06:02:16 JST Miander

     in reply to

     @icedquinn
     IIRC they use a simple adaptive filter like
     https://en.wikipedia.org/wiki/Least_mean_squares_filter
     basically just one neuron

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     iced depresso (icedquinn@blob.cat)'s status on Friday, 11-Apr-2025 06:02:57 JST iced depresso

     in reply to

     • Miander
     @mian to an extent this also works for materials but eh. i don't know vibration specialists and shit like ploopy does.