Inaudible audio tracking is IMO almost always against users informed consent, so apps doing it should be suspected as malware.
how can a TV filter hidden signal in audio? it's not like you need ultrasound/... to hide a message in sound
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Roughly speaking, by applying its own random signal modulated the same way the hidden tracking signal is modulated.
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if you don't know the encoding, you'll afaik need way more noise than the tracking signal itself, right?
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slight pitch changes, ...
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I don't think the TV can really guard against this. but perhaps the TV stations could, by rejecting near-dupe ads
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