| 摘要 |
PURPOSE:To allow a speaker selected from plural speakers to reproduce sound with simple configuration in the cordless acoustic reproduction system using an infrared ray. CONSTITUTION:The system is provided with transmission means 31, 32 modulating an audio signal and sending an infrared ray and plural reception reproduction means 20a, 20b, 20c,... each provided with a speaker 24 receiving an infrared ray, demodulating the ray and reproducing an audio signal. An optical means 33 is provided to the plural reception reproduction means, which controls the direction or the range of infrared ray emission. The optical means 33 controls the system so that only the selected reception reproduction means among the plural reception reproduction means receives the infrared ray. |
