1. horn; alarm; whistle; foghorn
2. Horn (acoustic)A horn 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.
Read “Horn (acoustic)” on English Wikipedia
Read “警笛” on Japanese Wikipedia
Read “Horn (acoustic)” on DBpedia
Read “Horn (acoustic)” on English Wikipedia
Read “警笛” on Japanese Wikipedia
Read “Horn (acoustic)” on DBpedia
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