| 摘要 |
PURPOSE:To reduce the crosstalk and to improve the reliability by connecting optical transmission lines between a sound source and four speakers and multiplexing four channel audio signals in time division with respect to optical signals propagated on respective optical transmission lines. CONSTITUTION:Four A/D converting parts 12a to 12d independent of one another convert audio signals which are inputted from signal input terminals 11a to 11d to digital signals. A time division multiplexing part 13 multiplexes signals outputted from converting parts 12a to 12d in time division by four-fold sampling frequencies of respective channels, and these signals are converted to optical signals by electrooptical converting parts 14a to 14d and are radiated to the air. These optical signals are converted to multiplexed audio signals by optical/electric signal converting parts 15a to 15d and are separated to signals of four channels by demultiplexing parts 16a to 16d. These signals are converted to analog signals by D/A converting parts 17a to 17d and are supplied to speakers 19a to 19d through amplifying parts 18a to 18d and are louded and outputted. |
