4 ms·
This will be torture for dogs. I is like a 5 kHz tone for humans. All laptops with a 5 kHz tone would be returned as defective. In the 90's harddrives often
by silvestrov 3y ago
This will be torture for dogs. I is like a 5 kHz tone for humans.
All laptops with a 5 kHz tone would be returned as defective. In the 90's harddrives often had a 7200 Hz whine which was enourmously annoying. Todays harddrives are silent compared to the old ones.
- da768 3y agoDogs survived CRT monitors and TVs, so I'd assume their behaviour would be known in that instance. I'm unlucky enough to hear 15 kHz, and you'd easily hear any TVs turned on two storeys away. CRT ultrasounds used to be unbearably, migraine-inducing loud. I assume laptop speakers wouldn't be anywhere as bad.
- xattt 3y agoTriggered. The 15 kHz whine was so pervasive that watching or listening to studio shows, CRTs within the studio could still be heard.
- ilyt 3y ago> In the 90's harddrives often had a 7200 Hz whine which was enourmously annoying. The what now ? nothing in hard drive runs at that frequency
- da768 3y agoMore like 7200 RPM, but that would be 120Hz. The motor would be driven by PWM though, that's more likely to cause sound issues
- tyingq 3y agoA deep dive into that topic...PWM drivers for hard drives, torque ripple, and reducing noise. https://www.ti.com/sc/docs/msp/papers/1998/bwhite.pdf https://www.ti.com/sc/docs/msp/papers/1998/bwhite.pdf
- jlokier 3y agoI agree it could be torture for all sorts of creatures, including small humans. But whether anything is bothered by the sound depends on the energy level and other characteristics. Spread spectrum ultrasound sonar below the local noise floor may be technically feasible, though perhaps not with regular laptop speakers and audio circuitry.