5 ms·
28kHz is either a typo or you give too much credit to human ears. 18kHz is more likely the real figure.
by crististm 10y ago
28kHz is either a typo or you give too much credit to human ears. 18kHz is more likely the real figure.
- mschuster91 10y agoThat depends on the ears, that's why the ultrasonic youth drive-aways are so successful. Old people simply can't hear them due to age and external degradation (loud rock music concerts). I, for example, can hear these ultrasonic weasel defenders, which operate between 20 and 30 kHz, again - when I used to work on outside construction works using massive jackhammers, excavators etc. I couldn't because daily stress would fuck up my ears.
- crististm 10y agoI have my doubts that humans can hear above 20kHz. It's more likely that the sound produced by those devices, even if ultrasonic, may produce intermodulations in the audible range.
- mschuster91 10y ago28 kHz is in fact correct, although only in lab conditions: > The commonly stated range of human hearing is 20 Hz to 20 kHz. Under ideal laboratory conditions, humans can hear sound as low as 12 Hz and as high as 28 kHz, though the threshold increases sharply at 15 kHz in adults, corresponding to the last auditory channel of the cochlea. (ref: https://en.wikipedia.org/wiki/Hearing_range https://en.wikipedia.org/wiki/Hearing_range)
- brian-armstrong 10y agoEven 18kHz is too high. Adolescents can only sometimes hear as high as 17kHz, and adults can often only hear as high as 14kHz.