| 摘要 |
<p>A microphone for hearing aid includes a housing (12) with first and second acoustic passages (18, 20) in communication with a microphone retaining chamber (28) and acoustic openings in an exterior surface. A microphone (26), disposed within the microphone retaining chamber has a first acoustic port (30) in an acoustic relationship with the first acoustic passage and a second acoustic port (32) in an acoustic relationship with the second acoustic passage. A first and second set of electrical leads are disposed within the housing. A switching mechanism (15) secured to the housing s positionable between a first position and a second position. In the first position, the first and second acoustic passages are in an acoustic receptive state and a first electric circuit is completed by connecting the first set of leads with a first connecting element while breaking a second circuit. In the second position, either the first or the second acoustic passage are in an acoustic receptive state and a second electric circuit is completedb y connecting the second set of leads with the second element while breaking the first circuit.</p> |
