| 摘要 |
<p>A hearing testing device (2) for self-testing the hearing of a subject including: an earpiece housing (4); a loudspeaker (46) located within the housing; and control circuitry (14) coupled to drive the loudspeaker, the control circuitry being arranged to produce a sequence of test signals which are inputted to the loudspeaker to produce a series of tones at frequencies corresponding to said test signals wherein said test signals do not include significant harmonic components.</p> |
