Quote:
Originally Posted by theducks
Not anymore.
I used to hear CRT TV flyback singing, Ultrasonic motion detectors used in alarms and traffic light triggers in the 70's.
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Ya, it's pretty common to hear well above 20k Hz up until sometime in your 20s. A little later sometimes.
I used to hear up to ~30k Hz. I had an unusually "cruel" high school physics teacher with an oscilloscope who left it on just above his own hearing range one day for a lesson.
Mr. Berg was a lot of fun. After we all complained and asked what it was he helped us all see where our own hearing maxed out and how low of frequencies we could hear. It was a painful class but very interesting. Now, I can't hear anything close to that but my daughters do.
I do get to enjoy the constant ~20kHz ringing that I used to hear from some electronics all the time now though. It's just all in my head now. Tinnitus is not your friend.