A Human "Proof"

[amfmsw]

Holy smokes! I heard it! I can't believe I can still hear that high. After my first rock concert at Wildwood Convention Center in 1972, my ears rang for hours. I thought it was cool. The act: Humble Pie w/Peter Frampton on lead with a massive stack of Marshall amps. And I've done dumber things since, mostly with headphones.

The TV horizontal oscillator at 15.75 used to bother me, but the newer sets (1980+) were much quieter than those with the classic
6FQ7 Horiz osc, 6JB6 Horiz out and 6DW4 damper tubes. Nothing from the HDTV...no scanning...either that or it's way past my scale.

And if you hear a stereo pilot on FM, it's not well designed or it's defective. That pilot tone is to be killed with the 15Kc bandwidth limiter.

 

[RadioFixerCLE]

I remember when I was a kid my grandparents had an insect repellant machine that would emit a high pitched clicking sound, and I could never understand why my nana couldn't hear it...R U DEAF???

About six years ago I returned one to Home Depot for exactly the same reason.

 

[radiosaur]

I don't hear the pilot as much as I sense it. I can't imagine why anyone would want that ring tone...I found it extremely uncomfortable, but to each his own.

That's exactly me, too. I can't really hear a pilot tone, but I can tell you if it's on or off.

When I was younger I couldn't stay in a room with one of those old sonic motion sensors.

 

[nmoore6676]

This one is aparantly 17kHz

http://graphics.nytimes.com/packages/audio/nyregion/20060610_RINGTONE.mp3

It's 15 kHz.

I am 64 and I hear the ring tone, it actually was a little painful. I can also hear those dog whistles that supposedly people can not hear. I could never actually hear the stereo pilot tone though. I can tell though if it is on or off. A lot of sound perception is sensing or feeling the vibrations. We know that more about very low frequencies because of the longer wavelength and because of that the physical sensation is greater, however it stands to reason that some part of our bodies could sense higher frequency tones as well.

If anyone has blown out their ears with headphones it should have been me, I always had them cranked to the point that a slight turn of my head would get a feedback squeal. That was in the old days when the mikes were much farther away, not right up in the face almost touching the Announcer’s lips like now.

 

[RealityCheckr]

Funny thing. When I listened to the ringtone my dog was lying next to me. He is 13 and quite deaf. But lying right next to the laptop there is no doubt he heard it!

 

[stace]

Watching the 6 O'clock news tonight I see you can buy an XMAS CD that only your dog can hear. The perfect gift for the dog that has everthing!!

Poor things. I guess we'll never know what 60kHz really sounds like

 

[kevtronics]

Watching the 6 O'clock news tonight I see you can buy an XMAS CD that only your dog can hear. The perfect gift for the dog that has everthing!!

Poor things. I guess we'll never know what 60kHz really sounds like

Neither will them. A standard CD has a maximum audio frequency response of 22.05 kHz, and the anti-aliasing filters in most good CD players (and computer sound cards) cuts off sharply above 20 kHz -- which is generally considered to be the upper limit of human hearing.

That CD probably just contains a telephone-quality music recording that was shifted up in frequency from 0-4 kHz to 16-20 kHz.

 

[stace]

I'm not sure what frequency the songs on the CD are at, but google tells me some dogs in their peak can hear sounds up to 60kHz.