Killing the 3.5mm Jack: How Simple Is Changing into Needlessly Complicated

Re:Killing the 3.5mm Jack: How Simple Is Changing into Needl... by gwbas1c on Monday June 13, 2016 @03:21PM (#11896592)

Humans can hear up to 28khz when paying close attention. "CD Quality" is slightly below the threshold of hearing, at a point where most people don't notice the difference or care to notice the difference.

It's also somewhat poorly-defined, because "CD quality" can mean lousy mid-range performance when rounding 24-bit to 16-bit, or high frequency hiss when noise-shaping 24-bit to 16-bit.

So "CD quality audio" is quite a degradation when you listen in a 100% quiet room with expensive speakers and your full attention.

[ Parent | on HN ]

Re:Killing the 3.5mm Jack: How Simple Is Changing into Needl... by crististm on Monday June 13, 2016 @04:44PM (#11897454)

28kHz is either a typo or you give too much credit to human ears. 18kHz is more likely the real figure.

[ Parent | on HN ]

Re:Killing the 3.5mm Jack: How Simple Is Changing into Needl... by mschuster91 on Monday June 13, 2016 @04:49PM (#11897492)

That 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.

[ Parent | on HN ]

Re:Killing the 3.5mm Jack: How Simple Is Changing into Needl... by crististm on Monday June 13, 2016 @05:00PM (#11897590)

I 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.

[ Parent | on HN ]

Re:Killing the 3.5mm Jack: How Simple Is Changing into Needl... by mschuster91 on Monday June 13, 2016 @05:19PM (#11897742)

28 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)

[ Parent | on HN ]

Re:Killing the 3.5mm Jack: How Simple Is Changing into Needl... by brian-armstrong on Monday June 13, 2016 @05:42PM (#11897945)

Even 18kHz is too high. Adolescents can only sometimes hear as high as 17kHz, and adults can often only hear as high as 14kHz.

[ Parent | on HN ]