| 摘要 |
PURPOSE:To keep always the acoustic area to be broad casted constantly by changing the length of a simultaneous or individual selecting signal, executing the output control of the output amplifier provided at the speaker classified by the direction and changing over the speaker output in accordance with the direction of wind and the speed of wind. CONSTITUTION:When a simultaneous signal (individual signal) C is received following a group designating signal (a) received by a signal input terminal 1 from a receiver, after the signal is selected by a vibrating lead filter 3, it is amplified and rectified by an amplifying and rectifying circuits 4, and the time of the simultaneous signal (individual signal) is classified by time constant circuits 5 and 10. The classified signal is stored into a memory and a logic circuit 6, and simultaneously, stored into an 'and' circuit and a memory circuit 11. A direction classification level setting circuit 12 set beforehand for the time classification of the simultaneous signal (individual signal) is controlled by a memory circuit 11, and the sound signal from a master station is amplified by an output amplifier 8 up to the output set respectively through the setting circuit 12 and outputted from a speaker 9. In the master station, the sending time of the simultaneous (individual signal) is changed by the direction of wind and the speed of wind and the slave station is controlled. |
