I want to low pass filter out above a certain range and export that recording into an mp4 that literally doesnt have that part’s information available rather than simply being calculated against but still present and audible if you remove the filter

Hard to describe but you know how people used to be advised to redact documents in their word processors and all it did was overlay black so it couldnt be read but the text was still there and machine-readable. I edit:DONTwant to do that. I suppose you would have to actually print or take a screenshot of picture of that document to actually practically “remove” the black text that lays beneath the black redaction bars

It could probably technically be done by taking that exported filtered original and screenrecording the playback and then it just records what is audible because the unwanted part is actually audially nowhere and theres no digital data of it preserved in the sound that gets recorded just like what a human would hear

Edit/ when I last tried it, i filtered out above a certain range (probably like > 500-750 hz somewhere like that) and when I exported it out of the app and imported into a new app and reduced the pitch a bunch, I swear I could hear the part I filtered out but it was just lower so it became audible again. It was as if oncethe pitch was reduced, it couldnt still be filtered out

  • afk_strats@lemmy.worldEnglish
    5·
    20 days ago

    Adding something like a filter can perfectly remove all sound in the filtered range. So this is technically possible.

    With a lot of sounds this is practically very hard because natural sounds have all kind of artifacts like reverb and harmonics which may not be in the range you’re filtering.

    Another thing to consider is that filters are often gradual. They are not perfect hard cutoffs to 0 db. So you may need to change some settings and/or filter a bit more than you expect to get the coverage you want.