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Sorry if I'm missing something, but television programming usually doesn't require code in the TV in order to emit audio. Is audio in ultrasonic frequencies a s
by hackuser 9y ago
Sorry if I'm missing something, but television programming usually doesn't require code in the TV in order to emit audio. Is audio in ultrasonic frequencies a special case?
- cazum 9y agoAlthough I can't confirm this myself, a few people here have mentioned that its likely that a digital TV signal's audio track would be compressed to remove inaudible ranges. This would require that any ultrasonic data be added by the TV.
- semi-extrinsic 9y agoFrom what I can tell, HDTV audio is typically sampled at 48kHz and compressed with AAC using spectral band replication (SBR) techniques. I'd definitely say it's plausible that signal could contain stuff outside a normal adult's hearing range.
- wodenokoto 9y agoAFAICT Yatenfou is saying that the ultrasonic tracking beacon is done by software on the smart TV and not actually part of the television signal.
- ceejayoz 9y agoThe risk with smart TVs is (as an example) CBS approaches Samsung and asks them to push code that makes the TV do a particular hard-to-notice sound when it detects the logo of a specific show being sent to the screen.