| 摘要 |
PROBLEM TO BE SOLVED: To provide a loudspeaker for automatically controlling a speaker output level so that a range where voice does not reach is not caused by a change in range where the voice reaches accompanying a change in wind direction and wind velocity . SOLUTION: An electronic volume is adopted for an amplification part, and a control processing unit (CPU) for regulating the amount of attenuation of the electronic volume is positioned. The CPU controls the amount of attenuation of the electronic volume on the basis of measurement data of the wind direction and wind velocity, so that the output level for every speaker can be controlled. As a result, the output level of a windward speaker is increased, while the output level of a leeward speaker is decreased. COPYRIGHT: (C)2004,JPO |
