| 摘要 |
PURPOSE:To attain communication even while the transmitter is being moved independently of the location and direction of the optical transmitter by constituting a light emitting section and a photodetection section by plural photodetectors. CONSTITUTION:In case of the communication between optical transmitters A, B, when the transmitter A gives a call to the transmitter B, an operation button 9 of the transmitter A is turned onto attain transmission enable state. When a voice is fed toward a microphone 1, the voice signal is amplitude- modulated by a modulation amplifier section 2 and given to the light emission section 3, where each light emitting element 3a radiates a light in all directions in response to the modulation signal. In such a case, even if both the optical transmitters A, B are moved, part of the light radiated from the transmitter A reaches the optical transmitter B to attain communication at all times. This is applied similarly also in case of the communication from the transmitter B toward the transmitter A. |
