Did we really need a new hearing simulation standard?Measuring headphones with the HF-HATS Type 5128

JUDE MANSILLA, HEAD-FI.ORG

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Hearing Simulator

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A hearing simulator is a device which connects the headphone under test to a microphone in such a way that the working load on the headphone is the same as if it was used on a real ear. Furthermore, the ear simulator should be made in such a way that the signal picked up by the microphone as a function of frequency is the same as the sound pressure in the ear canal at the eardrum.Brüel, P. V., Frederiksen, E., Mathiasen, H., Rasmussen, G., and Sigh, E. (1976): ‘Investigations of a new insert earphone coupler’, Part I in ‘Impedance of Real and Artificial Ears’, Brüel & Kjær report.

IEC 60318-4

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Known as the ‘711’ Standard.

The IEC 711 standard dates to 1981.

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Sinclair ZX81 with 1 KB of memory

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Human hearing simulation range of IEC 60318-4 (‘711’) compared to the full audio range

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Darkner, S., Sommer, S., Baandrup, A. O., Thomsen, C., & Jønsson, S. ‘An Average of the Human Ear Canal: Recovering Acoustic Properties with Shape Analysis’. Cornell Univ. Libr., ArXiv e-prints (2018).

S. Jønsson, A. Schuhmacher, H. Ingerslev Jørgensen, ‘Wideband impedance measurement techniques in small complex cavities such as ear simulators and the human ear canal’, ArXiv e-prints (2018).

S. Jønsson, A. Schuhmacher, H. Ingerslev Jørgensen, ‘Wideband impedance measurement in the human ear canal; In vivo study on 32 subjects’, ArXiv e-prints (2018).

Brüel & Kjær 5128 – Associated Papers

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Etymotic ER4XR

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Focal Clear

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Edgar A. G. Shaw

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…it is useful to divide the acoustic antenna system into its functional components: the head, the torso and the pinna flange acting as diffracting bodies, the concha and the ear canal serving as acoustic resonators, and the eardrum providing an acoustic termination. But these components must always be seen as parts of an integrated system...

Edgar A. G. Shaw, ‘The External Ear’, Handbook of Sensory Physiology: Auditory System

Thank You

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