| 摘要 |
Hearing aid for persons with an impaired hearing faculty, said hearing aid comprising a directional microphone whose pick-up characteristic can be altered, said pick-up characteristic being automatically controlled as a function of the input or output signal in such a way that all possible microphone characteristics may be set, and this is realized in that the directional microphone (10) is an electret microphone and that the changes in the pick-up characteristic take place electrically and continuously.
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