| 摘要 |
PURPOSE:To enable to obtain natural feeling of the attendance the same as speaker listening, by taking the diameter of mouth unit, distance from the entrance of ear, and angle of the center axis of mouth piece to specific value respectively. CONSTITUTION:Near the ears 2, 2' of the dummy head 1, the mouth piece units 4, 4' are placed. With this listening state, the diameter of mouth piece units 4, 4' is taken more than 3cm, the distance between the mouth piece unit and the entrance of ear is as 3cm, and the center line l of the mouth piece units 4, 4' is on the horizontal line taking the entrance of ear as the origin, and this center axis l is at an angle alpha between 0-60 deg. to the center. As a result, the signal S2 from the mouth piece unit 4 to the ear 2, is almost equal to the signal from the speaker to the ear at speaker listening, and natural feeling of attendance the same as speaker listening can be obtained. |
