Ringtones...

[chrishansenhome]

You are a dog

Or maybe you are a mosquito, you certainly can't be human. The highest pitched ultrasonic mosquito ringtone that I can hear is 21.1kHz

Find out which ringtones you can hear!

Comments

[bigmacbear]

I got up to 19.9 kHz, I think. They taught us in engineering school that you have to sample at more than twice the maximum frequency in the signal to avoid aliasing, and if you don't filter them out these alias frequencies (or "undertones") can actually be louder than the original tone. I could hear alias tones at all frequencies up to 21.1 kHz but nothing in as high a register as the 19.9 kHz and below.

As I may have mentioned, as a child I used to be wary of shopping with my mom at a particular department store that used an ultrasonic sensor at the entrances, because it hurt my ears. These samples, too, have some disorienting effects even today.