| 摘要 |
PURPOSE:To transmit the accurate traffic snarl information to a number of cars, by superposing signal data at the transmitting side and providing a function to extract data out of a radio receiver and a function to display the data in the form of the visual information at the receiving side. CONSTITUTION:An additional device of the transmitting side is shown by a dotted line in the block diagram. A control board part 62 can feed a congestion state of each intersection in three steps of red, yellow and blue, etc. and based on the data given from a road traffic information center, etc. The signal supplied from the part 62 is converted into an ultralow frequency acoustic signal 64 through an acoustic signal part 63 and sent to the 3rd studio part 65. Then the signal 64 is transmitted from the part 65 as a signal which substitutes the 3rd record player 66 and then mixed up with audio signals, etc. for ordinary broadcast in a mixer room 68 through the 3rd control table 67 and in the form of the 3rd studio signal to be modulated through a buffer amplifier part 69, a modulating amplifier part 610 and a modulating part 611. While a crystal oscillator 612 is led to an oscillating part 613, a buffer amplifier part 614 and the 1st power amplifier part 615 to receive modulation and then led to a transmission center 617. |
