| 摘要 |
PURPOSE:To reproduce a low sound with good S/N ratio without a high frequency sound noise at an external space and to apply this system especially to acoustic reproduction by outputting a sound wave after the high frequency sound is cut off or attenuated without outputting the wave directly. CONSTITUTION:An acoustic chamber 11 is formed as a box form, and a passive radiator 12 is equipped with a wall part 11a opposite to an air flow speaker 10. The sound wave from the speaker 10 is not directly outputted to the external space but irradiated in the acoustic chamber 11 and outputted to the external space via the apssive radiator 12. The high frequency sound in the outputted sound wave in this case is cut off by the passive radiator 12. That is, the high frequency sound including much noise component is cut off and then radiated. |
