| 摘要 |
A first IR transmission portion is disposed in front of a rear seat of a vehicle while a second IR transmission portion is disposed at the rear of the rear seat. A fellow passenger in the rear seat puts on headphones so as to receive and listen to audio signals. The first and second IR transmission portions optically modulate the same audio information and radiate it spatially. For example, LEDs emitting infrared light are used as devices for the optical conversion. The first IR transmission portion transmits optical signals from the front toward the rear while the second IR transmission portion transmits the optical signals from the rear toward the front. Particularly by the second IR transmission portion, the signals are transmitted to the front including the driver's seat of the vehicle so that any dead zone can be removed from the vehicle interior. |
