PURPOSE: To measure a miniature headphone characteristic, in the same state as hearing of a human ear, by adding an acoustic leak impedance element to an artificial ear.
CONSTITUTION: An acoustic impedance element 1 formed by an air gap or a thin-diameter opening tube for simulating an acoustic leak is added to an artificial ear 2 having an external auditory meatus part for simulating an external auditory meatus of a human ear, or a ear hole cavity (depression) 7 for simulating an ear hole cavity. That is, the air gap or the thin diameter open tube (thin hole) generates an acoustic leak through the external auditory meatus part of an artificial ear 2 and open air, at the time of attaching a miniature headphone to the artificial ear 2. In this case, by adjusting suitably the thickness, width and length of the air gap or the radius of the thin-diameter opening tube, the acoustic leak quantity to the open air from the external auditory meatus part can be controlled. In such a way, the miniature headphone characteristic can be measured in consideration of the accoustic leak in the human ear.
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TAZAWA KENICHI
MIURA TANETOSHI
OKABE KAORU
