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A comment on Beware of ads that use inaudible sound to link your phone, TV, tablet, and PC. Parent comment

Re:Beware of ads that use inaudible sound to link your phone... by raverbashing on Friday November 13, 2015 @06:39PM (#10563241)
However, TV sound is band-limited (Analog TV at ~ 15kHz IIRC, the higher band is used for CC), not sure about digital tv, maybe 20kHz (not considering limitations on the sound circuits + speakers)
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Re:Beware of ads that use inaudible sound to link your phone... by nitrogen on Saturday November 14, 2015 @12:59PM (#10566545)
I think CC is carried in the video's vertical blanking interval, at least in NTSC, rather than the audio.
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