| 摘要 |
PROBLEM TO BE SOLVED: To obtain optimum stereophonic effect irrelevantly to the number of passengers by installing speakers behind a back panel left-side passenger's seat, in the center, and right behind a right-side passenger's seat. SOLUTION: A speaker 2(L) is connected to the back of the left-side passenger's seat 8 of the back panel of a cab by an electric circuit through a fade-in means 2a and a fade-out means 2b. Further, a speaker 3(C) is connected in the center by an electric circuit and a speaker 4(R) are connected right behind the right-side driver's seat 7 respectively. These speakers are arranged so that they do not move in the back and forth direction. To a controller 5 provided to an audio equipment main body 1, a seat sensor 6 which is provided on the seat surface of the passenger's seat is connected by an electric circuit. The controller 5 switches and outputs the right and left stereophonic outputs outputted to the speakers to the speakers with the signal from the seat sensor 6 according to a previously provided program. Consequently, optimum stereophonic effect can be obtained irrelevantly to the number of passengers. |
