High frequent sinus tone from screen

Sometimes I can hear a “not very dramatic” high frequent “sinus” type of sound, coming from the iMac`s screen. Sometimes it occurs when “altering visual graphics”. For example, when opening Safari, or other applications. 10 minutes ago, I heard the sound. Right now, having two different active programs on my desktop, like Safari and Word, the “sinus tone” is gone.
I`ve heard this sound on older television sets, but I don`t have a clue of what it could be. No disaster, but I wonder: Is this normal?
Thank you,in advance.

AppleCare's Express Lane. Do note that if you're within 50 miles (80 KM) of an Apple repair station, you're eligible for onsite repair since yours is a desktop machine.

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