| 摘要 |
PURPOSE:To improve the ratio of an inputted voice to a noise by making the shape of a reflector plate installed so as to be opposed to a microphone into the same shape as a part of an ellipsoid surface whose two focuses are the positions of the vicinity of the mouth of the speaking person of the voice and the microphone. CONSTITUTION:The microphone 1 is fixed to a microphone slide part 2 on the center line of a steering wheel 5, and is non-directional. The microphone slide part 2 is fixed to a supporting body 3, and the supporting body 3 is fixed to the reflector plate 4. The reflector plate 4 is a part of the ellipsoid surface at its inside reflecting surface whose two focuses are the supposed position of the mouth and the normal position of the microphone 1, and whose longitudinal direction is the center line of the steering wheel 5 providing that the supposed position of the mouth of a driver is positioned on the center line of the steering wheel 5, and it is fixed at the center of the steering wheel 5. Accordingly, the voice uttered by the driver is reflected by the reflector plate 4, and is converged to the position of the microphone 1 even if the steering wheel is rotated by driving operation, and is inputted by the microphone 1. |
