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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 caf on Saturday November 14, 2015 @07:59AM (#10565506)
With CRTs I believe it's the flyback transformer frequency you can hear.
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Re:Beware of ads that use inaudible sound to link your phone... by gvb on Saturday November 14, 2015 @10:06AM (#10565889)
Correct.

262.5 lines/frame * 60 frames/sec = 15750 Hz.

Ref: http://www.infocellar.com/television/scanning.htm

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