| 摘要 |
PURPOSE: To adjust the sound volume or the like by sending a sound signal through the use of an optical fiber in the speaker system where a main amplifier and plural speakers are connected and using an optical signal to send a control signal from a terminal equipment to a main body equipment. CONSTITUTION: Plural terminal equipments 10,... are arranged to a main amplifier 2 connecting to a music source and they are interconnected by a transmission line 5 using feeder 6 and an optical fiber 7 and an audio signal is sent via the optical fiber 7 to form the speaker system. In this system, an adjustment means of sound volume or the like to at least one of the terminal equipments 10,... for other terminal equipment than the main body equipment and the control signal is sent by using an optical signal. |
