Last time I was tested I could hear 18 kHz at -5 dB and it was painful at anything above that. I hope this app doesn’t get popular.
When I was under 30, I could hear above that. Not any more. But I know it will drive dogs crazy.
Mac Daily News brought up these questions:
Three questions:1. How much battery drain is caused by having the device constantly emit and listen for an 18 kHz tone?
2. How does the device detect squeezes when the speaker and/or microphone are in use by other applications (phone, music, movies, TV shows, personal assistant, dictation, notification sounds, etc.) or when the phone itself vibrates (rings, text tones, new mail, alerts, etc.)?
3. How do dogs and other pets deal with devices that are constantly emitting an 18 kHz tone?
We’ll stick with Apple’s patented 3D Touch on our iPhone 6s and iPhone 6s Plus units, thanks, because it’s not constantly draining the battery, it works all the time, and it doesn’t drive the dog batshit insane.
And, by the way, some humans (usually younger ones with new ears) can hear frequencies as high as 28 kHz, so we doubt babies or children are going to enjoy devices that are constantly emitting 18 kHz tones, either.
Infants have been tested and shown to react to sounds up to 28KHz.