Old as dirt

[ST]

I participate in several online communities. In one such motley crew, someone posted an mp3 file with a high-pitched tone. He was trying to diagnose and eliminate this shrill intrusion in the sound system.

As I listened to the audio file, unbidden and unfettered by conscious filters I thought, "Oh, that's a heterodyne squeal or a failing TV flyback transformer."

Before I replied to the fellow with the disturbing distraction, as I often do, I checked on the terminology I was about to use.

If you have a Google Home device, try this

"Okay Google, what's a heterodyne squeal?"

Don't scroll down until you've done it.
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If you don't have Google Home, this is what Google said,
"This is what pigs sound like. Snort, snort, snort, snort."

[eded]

I used to be able to hear it.  The one I found just felt like pressure on my ears until I turned it up a bit.

Old as dirt, indeed.

Ed