| 摘要 |
PROBLEM TO BE SOLVED: To improve the sensitivity of a differential microphone, in a head set having a differential microphone. ! SOLUTION: In a head set 10, an arm head 113 accommodating a differential microphone comprises: a first sound hole 116 connected to the differential microphone; and a second sound hole 117 connected to the differential microphone, the distance between the second sound hole 117 and the earphone speaker being shorter than the distance between the first hound hole 116 and the earphone speaker. If the distance between the earphone speaker and the first sound hole 116 is L (mm), the angle between the straight line extending from the first sound hole 116 to the earphone speaker and the straight line extending from the first sound hole 116 to the second sound hole 117 is θ(°), and the median of θ is θ1(°), 40≤L≤120, θ1=0.0035 L2-0.1781 L+15.239, θ1-20≤θ≤θ1+20 are all satisfied. ! COPYRIGHT: (C)2014,JPO&INPIT |
