Re:AirPods Causing Tinnitus (600+ reports since 2019?)
by kortilla on Saturday February 13, 2021 @04:12PM
(#26126974)
Phase mismatch won’t change frequency
Re:AirPods Causing Tinnitus (600+ reports since 2019?)
by nyanpasu64 on Saturday February 13, 2021 @04:02PM
(#26126875)
A noise-cancelling system can be designed to filter out and not produce high-frequency sound, to not worsen the problem. I'm not sure if properly designed noise cancelling can produce increased pressures felt by any parts of the eardrum or ear canal or outer ear.
Re:AirPods Causing Tinnitus (600+ reports since 2019?)
by ants_a on Saturday February 13, 2021 @04:20PM
(#26127048)
What is the mechanism for this? From what I remember of signal processing, linear combination of waves of a specific frequency can only result in a combined signal of the same frequency but different phase and amplitude.
Re:AirPods Causing Tinnitus (600+ reports since 2019?)
by NathanielK on Saturday February 13, 2021 @06:30PM
(#26128075)
It's not just phase mismatch. There is error in the frequency domain, both from the digital processing going on and the physical characteristics of the driver.
not always true. Minor phase mismatch will create higher frequency sound. You wouldn't hear ultrasound, though how bad it is to have an ultrasound source in you ears i don't know.
The phase mismatch can be temporal - circuitry reacting either a bit too fast or too slow - as well as spatial - the sound wave front most probably aren't parallel to the speakers frontal plane.