Spiral line array loudspeaker
AssigneeQSC Audio Products, Inc.
InventorsMark E. Engebretson, Luis F. Esparza
Life of this patent
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Abstract
A loudspeaker system consisting of a plurality of direct-radiating electro-acoustical drivers arrayed along a spiral line. The acoustical drivers may be directly coupled to an acoustical waveguide without use of adapters or a throat section. The waveguide and the acoustical drivers may thus be oriented along the spiral line so as to produce controlled vertical and horizontal angular coverage with improved phase coherence and reduced distortion. A plurality of phase plugs may be interspersed between the plurality of acoustical drivers to assist in equalizing the sound path to achieve uniform phase at the mouth of the waveguide.
Claims31
A loudspeaker comprising:
- a plurality of electro-acoustical drivers each having a radiating axis to generate sound over a range of frequencies, wherein said plurality of electro-acoustical drivers are disposed in a geometric spiral with successive increases in angular displacement between said radiating axes forming a spiral line array;
- and
- a waveguide acoustically coupled to said plurality of electro-acoustical drivers, and further comprising intervals between each of said plurality of electro-acoustical drivers in which each of said intervals include a prismatic frustum wedge segment extending outward from a driver mounting surface to a point no further than a mouth of said waveguide to form a linear phase plug.
A sound radiation system comprising:
- a plurality of electro-acoustical transducers each having a radiating axis to generate sound over a range of frequencies, wherein said plurality of electro-acoustical drivers are disposed in a geometric spiral with successive increases in angular displacement between said radiating axes forming a spiral line array;
- and
- a waveguide acoustically coupled to said plurality of electro-acoustical drivers, and wherein said plurality of electro-acoustical transducers are further interspersed by intervals each of which includes a prismatic frustum wedge segment extending outward from a driver mounting surface towards a mouth of said waveguide.
A waveguide system comprising a waveguide acoustically coupled to a plurality of electro-acoustical drivers each having a radiating axis to generate sound over a range of frequencies, wherein said plurality of electro-acoustical drivers are disposed in a geometric spiral with successive increases in angular displacement between said radiating axes forming a spiral line array, and further comprising intervals between each of said plurality of electro-acoustical drivers in which each of said intervals include a prismatic frustum wedge segment extending outward from a driver mounting surface to a point no further than a mouth of said waveguide to form a linear phase plug.
Dependencies are inferred from the claim text.