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I'm wondering if shifting frequency chirps like LORA uses would work in audio frequencies? You might be able to get the same sort of ability to grab usable sign
by bigiain 2y ago
I'm wondering if shifting frequency chirps like LORA uses would work in audio frequencies? You might be able to get the same sort of ability to grab usable signal at many db below the noise, and be able to send data over normal talking/music audio without it being obvious you're doing so. (I wanted to say "undetectably", but it'd end up showing up fairly obviously to anyone looking for it. Or to Aphex Twin if he saw it in his Windowlicker software...)
- nomel 2y agoThe issue is the (many) vocoders along the chain remove anything that don't match the vocal patterns of a human. When you say hello, it's encoded phonetically to a very low bitrate. Noise, or anything outside what a human vocal cord can do, is aggressively filtered or encoded as vocal sounding things. Except for DTMF, which must be preserved for backwards compatibility. That's why I say it would be creepy to do something higher bitrate...your data stream would literally and necessarily be human vocal sounds!
- _def 2y agoData exfiltration via bird