| 摘要 |
<p>An improved high-frequency characteristic is achieved, in an otherwise conventional hearing aid receiver transducer by connecting each of the acoustic chambers (41,42) on the two sides of the receiver diaphragm (34), in the receiver housing (29), directly through an outlet port (31,32) and a sound transmission tube (61,62) coupled into the ear canal (64) of the hearing aid user; phase reversals due to resonances in the receiving acoustic chambers and tubes produce a high pass band in the output of the receiver as applied to the user's ear. An acoustically transparent contamination stop (65) prevents contaminants (e.g. cerumen) from reaching the transducer motor (40) but does not interfere with acoustic performance. <IMAGE></p> |
