| 摘要 |
An auditory assistance apparatus and method for use with a sound signal source which also produces a magnetic field propagated along a magnetic field axis to increase the signal-to-noise ratio with respect to ambient noise. A pair of magnetic pickup coils of substantially the same electrical and magnetic parameters, but of opposite polarity, are located close to the sound signal source and oriented symmetrically with respect to the geometrical axis of the auditory assistance apparatus with the magnetic axes of the pickup coils substantially parallel to each other and substantially perpendicular to the magnetic field axis of the sound signal source and the geometrical axis of the auditory assistance apparatus; and an amplifier which adds and amplifies the outputs of the serially-connected pickup coils and feeds same to an audio transducer for conversion to sound.
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