| 摘要 |
PURPOSE:To cause a numerous people to simultaneouly listen to desired sound in a limited space such as a same room, an office and to view a related video by providing a sound originator which has a first and a second light-receiving parts and which supplies a sound signal obtained by demodulating an output signal from the second light-receiving part to an electric acoustic converter. CONSTITUTION:If a signal from a sound signal source and a video signal source are supplied to a transmitter 7, it PCM-modulates and time divisionly multiplex the audio signals of plural channels, and generates laser beams modulated by the multiplexed signals from a light-emitting part 8. A video projector as a display device and a headphone device as the sound originator are provided in the same room as a stereo reproducing device and a television receiver 6. The light-receiving part 13 which receives light beams from the light-emitting part 8 in the transmitter 7 is provided on the top part of a fitting band 12 in the headphone device 11, and a circuit device 14 such as decoder circuit and an amplifier is provided along the rear surface of the fitting band 12. |
