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How do you remove an "invisible" watermark from an audio file? Is it just a frequency outside of normal hearing that can be removed by re-compressing the audio
by ed25519FUUU 6y ago
How do you remove an "invisible" watermark from an audio file? Is it just a frequency outside of normal hearing that can be removed by re-compressing the audio to remove the high and low range sounds?
- kevin_thibedeau 6y agoIt could be encoded as metadata, stereo phase differences, or low level "noise" in the audible band. You have to cover all possible bases to be sure.
- ddingus 6y agohttps://blogalytics.typepad.com/files/a-technical-look-at-arbitrons-ppm-system.pdf https://blogalytics.typepad.com/files/a-technical-look-at-ar... I bet the system in use looks a lot like Arbitrons system. It is near impossible to hear. And when someone does, it basically sounds like very minor league codec artifacts. Someone very familiar with a given voice, or other content, may possibly be able to tell. But an A / B test of this VS. codec artifacts will likely prove inconclusive. It is hard given clean audio to compare against. Once things have gone through a codec, all bets are essentially off. This is not to say software detector could not be used. The average phone should do fine.
- deleted 6y ago[deleted]