| 摘要 |
A hearing apparatus for use in mediate auscultation comprises an electrically operated microphone that can generate signals representative of sounds pickedup thereby. In use, signals so generated are amplified and filtered by a first amplifier arrangement to produce signals representing only body sounds picked-up by the microphone, a second amplifier arrangement amplifying these filtered signals and permitting the sounds represented by these signals to be listened to by means of listening means such as earphones end a loudspeaker. Provision also is made for displaying body sounds in a suitable format and also for recording body sounds.
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