Re: Actions speak louder than words... or do they?
It's probably harder for us. I haven't researched the topic but I'm guessing there are ways to do it that don't mess with the sound but are visible in a spectral analysis. We would have to implant a constant tone at a frequency we know, but we're band limited by our sample rate. Since Nyquist's theorem states that we need twice the sampling rate of the highest frequency we want to reproduce, we might have to up sample our audio. We have up to 22050 at 44.1K and 24000 at 48K, but we wouldn't want to use those values, as that's what you'd expect someone to do. Not only that, but you'd have to slow the thing down to hear it, and who says that wasn't there to begin with. I don't think there's a way for us to do this in a way that's as identifiable as the sighted world has at their disposal.
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