| 摘要 |
PROBLEM TO BE SOLVED: To provide a configuration of a hearing aid for relieving howling.SOLUTION: In order to attenuate 2000-4000 Hz as a maximum amplification frequency of a hearing aid, which is easy to generate howling and determined by frequency characteristics of the hearing aid, a BEF (band attenuation filter) 4 is used having TT (twinT) 10 or BT (bridgedT) characteristics with a maximum attenuation frequency set to 3500 Hz. To improve the characteristics, a positive feedback may be applied using an operational amplifier 11.SELECTED DRAWING: Figure 7 |
