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An acoustic horn or waveguide is a tapered sound guide designed to provide an acoustic impedance match between a sound source and free air. This has the effect of maximizing the efficiency with which sound waves from the particular source are transferred to the air. Conversely, a horn can be used at the receiving end to optimize the transfer of sound from the air to a receiver. Acoustic horns are found in nature in the form of the burrows constructed by male mole crickets to amplify their song. == Applications == Acoustic horns are used in: * horn loudspeakers * musical horns * vehicle horns such as those used on cars, trucks, trains, boats, and bicycles * megaphones, often used by lifeguards at public swimming pools. * ear horns, used by people who are hard of hearing (the human ear itself having the form of a horn) * pickup horns, used e.g. on acoustic phonograph players 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Horn (acoustic)」の詳細全文を読む スポンサード リンク
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