| 摘要 |
A loudspeaker for projecting siren and other warning signals which is compact to facilitate installation in emergency vehicles, and which provides a horn projector in the compact space. The loudspeaker has a support in which an electrically driven driver unit is mounted. A chamber providing a plurality of cyclonic or spiral paths for sound from the speaker is located at one end of the support as by being connected to the support or being a part thereof. The support has a plurality of passageways for sound from each of the paths to exit ports at an end of the support opposite to the end thereof attached to or having the chamber. The cyclonic paths and the passageways are of like length and taper so that the sound from the exit ports combined in reinforcing relationship and projects outwardly from the exit port end of the support. The support provides a recombiner for the sound propagating along the cyclonic paths and passageways to provide the effect of a long horn in the compact space.
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