| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenatal training device with which a music source can easily be selected out of wide fields, having satisfactory acoustic characteristics. SOLUTION: In this antenatal training device, a suitable music source for antenatal training is easily selected by objectively grasping the acoustic characteristics of a music signal for antenatal training to be radiated from the device into the womb from sounds (antenatal sounds) heard by an unborn child, and a component to become a noise for the unborn child is suppressed as much as possible by limiting the frequency characteristics of the music source for antenatal training to an effective frequency area. Thus, the frequency characteristics of a source music signal are corrected while considering the frequency characteristics of sounds (antenatal sounds) ordinarily heard by the unborn child in the womb or frequency characteristics on the hearing ability of the unborn child. As a music source for antenatal training, music having the tempo of 30 to 45 beats is preferable. Further, the device has music sources for antenatal training and for mother and can simultaneously play both.
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