| 摘要 |
PURPOSE:To attain freely the reception of a sound signal enen at any place in a moving space in the aircraft by modulating light or ultrasonic wave or the like by plural kinds of sound signals, irradiating the result from sereral positions in the circraft and carrying a receiver receiving the modulated signal. CONSTITUTION:Sound signals from sound sources A-D are subject to preamplification 2a-2d, fed to optical mudulators 3a-3d, optical signals (ultrasonic wave signals) 4-7 are modulated and the result is mixed (9) via buffer circuit 8a-8d. The mixed signal is transmitted to a transmission means 11 via an optical fiber 10 (ultrasonic wave transmission line). The transmission means is arranged separately to proper locations 11a-11f in the moving space in the aircraft. A receiver 12 receives the signal, a selector 13 selects a desired signal source, the signal is detected (14) and amplified (15) and listened to by a receiver 16. Thus, the sound signal is received at any place in the mobile space in the aircraft. |
