Very high intelligibility mass notofication system
OwnerDavid J. Graebener, David J. Michno +1inventors
InventorsDavid J. Graebener, David J. Michno, Kenneth H. Winter
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Abstract
A mass notification system (MNS) loudspeaker having very high intelligibility. The MNS loudspeaker includes a plurality of transducers arranged in a symmetric pattern around an axis, so as to produce a substantially cylindrical wave front of sound pressure. The loudspeakers are coupled to a cap, and form a cylinder whose inner diameter is large enough to slip over a pole to which the loudspeakers are to be mounted. The under side of the cap may rest atop the pole. An inner cylinder encloses an air volume behind the transducers for acoustic loading and environmental protection of the transducers. An optional telescoping stand retracts into the inner cylinder.
Claims25
A mass notification loudspeaker comprising:
- a plurality of at least five elongated transducers each having a diaphragm whose height is at least twice its width;
- wherein the transducers are coupled together to form a loudspeaker having a substantially cylindrical shape with the diaphragms facing outward;
- wherein the transducers are disposed about an axis of the cylindrical shape on spacing no greater than 360°/8=45° average spacing;
- wherein the transducers occupy a single contiguous group of positions about the axis having at least 90° edge-to-edge coverage.
A mass notification loudspeaker comprising:
- a rain cap;
- a plurality of N elongated transducers coupled to the rain cap and forming a substantially cylindrical shape having an axial space within the plurality of transducers;
- wherein N is a positive integer greater than seven;
- wherein the transducers are disposed at substantially equal 360° N positions about the cylindrical shape.
Dependencies are inferred from the claim text.