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? asked in Consumer ElectronicsTVs · 6 years ago

What is the explanation behind a person being able to "sense" when a television is on even when it isn't make any noise?

2 Answers

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  • spacemissing
    Lv 7
    6 years ago
    Favorite Answer

    In "the old days" of CRT TVs, it was easy to hear the deflection yoke vibrating at the vertical (60 or 59.94 Hz, for B&W and colour respectively)

    and horizontal (15,750 or 15,734 Hz) sweep frequencies.

    I grew up with those sounds (1960s - 1970s)

    and still occasionally hear them.

    Plasma and LCD TVs don't make much noise at any audible frequency, so they are much more difficult to detect.

  • AVDADDY
    Lv 7
    6 years ago

    That would be the "sense" of vision.

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