Brüel & Kjær's "Evolution Of Hearing Simulation - Part 2" Coming Soon
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In Brüel & Kjær's Evolution Of Hearing Simulation - Part 1 video, well-known acoustic specialist Mr. John Bareham explained the development of hearing simulation from back in the 1970’s up to 2019, and why we use ear simulators. You can watch it below:


Next week, Brüel & Kjær will be releasing Evolution Of Hearing Simulation - Part 2, in which their new measurement standard -- the Brüel & Kjær 5128 -- is explained. Based on research by Brüel & Kjær from 2003 to 2017, the 5128 provides the most human-like ear simulator to date, an important evolution beyond the simplistic geometry of current ear simulators.

We've been measuring with the 5128 since late last year here at Head-Fi HQ, and will be shifting over to the 5128 as our primary measurement fixture. The results so far have been exciting, and it will provide measurements that provide greater clarity, more closely aligning with our subjective impressions of headphones (both in-ear and around-ear/on-ear).

Please watch Part 1 above, and then Part 2 next week.
 
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...I wonder if it's well dampened, since even bone, fat, and muscle can have an effect on the audio (dampening).
Coincidentally, I was reading a paper recently that mentioned that the damping factor of the human ear canal is estimated to be three times higher than that of a corresponding brass tube.*

There's exhaustive new research behind the 5128, and it does, for example, actually mimic the transition from soft tissue to the bonier condition nearer the eardrum.

I'll be discussing the 5128 more next week.



*Hudde, H., and Engel, A. “Measuring and modeling basic properties of the human middle ear and ear canal. Part II: Ear canal, middle ear cavities, eardrum, and ossicles,” ACUSTICA - acta acustica Vol. 84 (1998) 894–913.
 
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Isn't the 5128 HATS a head and torso simulator that's been around for a few years now?

It looks like the B&K dummy head contains an IEC 60318-7 compliant coupler. Is this in any way different from IEC 60318-4?
I found this: https://www.sis.se/api/document/preview/8025984/ but it doesn't indicate any specific differences in the coupler itself.
 
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Isn't the 5128 HATS a head and torso simulator that's been around for a few years now?...
Brüel & Kjær announced the 5128 at the 143rd AES convention in New York back in October 2017, but, if I recall correctly, it wasn't shipping more widely until last year.

...It looks like the B&K dummy head contains an IEC 60318-7 compliant coupler. Is this in any way different from IEC 60318-4?
I found this: https://www.sis.se/api/document/preview/8025984/ but it doesn't indicate any specific differences in the coupler itself.
The head and torso geometry of the 5128 complies with ITU-T Rec. P.58, IEC 60318-7 and ANSI S3.36-1985. The 5128's coupler design, however, is very different from the current standard. It's entirely new, and is part of a pinna/canal/eardrum system intended to set a new standard. (I believe the pinna/canal/eardrum assembly is available separate from the head and torso, and is called the Brüel & Kjær 4620.)

The Brüel & Kjær 5128/4620 is intended to provide more realism in audio testing, covering the full audible frequency range of 20 Hz to 20 kHz. And while it's exciting to finally see an actual defined human average response above 10 kHz, there are differences in response below that, too, versus the previous standards.
 
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