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US 6,389,146 B1Granted
Acoustically asymmetric bandpass loudspeaker with multiple acoustic filters
AssigneeAmerican Technology Corporation
InventorJames J. Croft, III
Life of this patent
Estimating the term…
Abstract
In a preferred embodiment, a bandpass loudspeaker enclosure includes three sub chambers, a first one being a non-Helmholtz-reflex chamber of a sealed acoustic suspension construction, and the remaining two chambers utilizing two passive acoustic radiators to achieve two Helmholtz-reflex vent tunings and a multiple of low pass acoustic filters that provide an acoustic bandpass with a substantially 2nd order high pass characteristic combined with an extended, steeper, at least 4th order slope low pass stop band characteristic.
Claims34
A loudspeaker system comprising:
- at least one electroacoustical transducer for converting an input electrical signal into corresponding acoustic output,
- an enclosure divided into at least first, second and third subchambers by at least first and second dividing walls,
- said first dividing wall supporting and coacting with said at least one electroacoustical transducer to bound said first and said second subchambers,
- at least one passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling said second and third subchambers,
- at least one additional passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling at least one of said second and third subchambers with the region outside said enclosure,
- each of said subchambers having the characterization of acoustic compliance,
- said passive acoustic radiator masses interacting with second and third subchamber compliances to form a total of two Helmholtz-reflex tunings at two spaced frequencies in the passband of said loudspeaker,
- wherein said passive acoustic radiators have the characteristic of acoustic mass and are selected from the group consisting of vents, ports, and suspended passive diaphragms,
- wherein said first subchamber is characterized as operating in a non-Helmholtz-reflex mode.
6 more elements
A loudspeaker system comprising:
- at least one electroacoustical transducer for converting an input electrical signal into corresponding acoustic output,
- an enclosure divided into at least first, second and third subchambers by at least first and second dividing walls,
- said first dividing wall supporting and coacting with said at least one electroacoustical transducer to bound said first and said second subchambers,
- at least one passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling said second and third subchambers,
- at least one additional passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling at least one of said second and third subchambers with the region outside said enclosure,
- each of said subchambers having the characterization of acoustic compliance,
- said passive acoustic radiator masses interacting with second and third subchamber compliances to form a total of two Helmholtz-reflex tunings at two spaced frequencies in the passband of said loudspeaker,
- wherein said first subchamber is a substantially closed box, acoustic suspension subchamber.
5 more elements
A loudspeaker system comprising:
- at least one electroacoustical transducer for converting an input electrical signal into corresponding acoustic output,
- an enclosure divided into at least first, second, third, and fourth subchambers by at least first, second, and third dividing walls,
- said first dividing wall supporting and coacting with said at least one electroacoustical transducer to bound said first and said second subchambers,
- at least one passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling said second and third subchambers,
- at least one additional passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling at least one of said second, third, or fourth subchambers with the region outside said enclosure,
- each of said subchambers having the characterization of acoustic compliance,
- said passive acoustic radiator masses interacting with second, third, and fourth subchamber compliances to form a total of three Helmholtz-reflex tunings at three spaced frequencies in the passband of said loudspeaker,
- wherein said first subchamber is a substantially closed box, acoustic suspension subchamber.
5 more elements
A loudspeaker system comprising:
- at least one electroacoustical transducer for converting an input electrical signal into a corresponding acoustic output,
- an enclosure divided into N number of subchamber by at least N−1 number of dividing walls with N≧3,
- said first dividing wall supporting and coacting with said at least one electroacoustical transducer to bound said first and a second subchamber,
- at least one passive acoustic radiator specifically designed to realize a predetermined acoustic mass and coupling each subchamber to a region outside each said subchamber except for said first subchamber,
- at least one additional passive acoustic radiator designed to realize a predetermined acoustic mass and intercoupling at least one of said subchamber, other than said first subchamber, to the region outside said enclosure,
- said first subchamber characterized as operating in a non-Helmholtz-reflex mode and each of remaining said subchamber having the characterization of acoustic compliance,
- said passive acoustic radiator masses interacting with subchamber compliances to form a total of N−1 Helmholtz-reflex tunings at spaced frequencies in the passband of said loudspeaker.
4 more elements
A loudspeaker system comprising:
- at least one electroacoustical transducer having a vibratable diaphragm for converting an input electrical signal into a corresponding acoustic output signal,
- an enclosure divided into at least first, second and third subchambers by at least first and second dividing walls,
- said first dividing wall supporting and coacting with said first electroacoustical transducer to bound said first and said second subchambers,
- at least a first passive radiator specifically designed to realize a predetermined acoustic mass and intercoupling said second and third subchambers,
- at least a second passive radiator specifically designed to realize a predetermined acoustic mass and intercoupling at least one of said second and third subchambers with the region outside said enclosure,
- each of said subchambers characterized by acoustic compliance,
- said passive acoustic radiator masses and said acoustic compliances selected to establish a total of two spaced frequencies in the passband of said loudspeaker system,
- wherein said passive acoustic radiator has the characteristic of acoustic mass and is selected from the group consisting of vents, ports, and suspended passive diaphargms,
- wherein said first subchamber is a closed box, acoustic suspension subchamber.
6 more elements
A loudspeaker system comprising:
- at least one electroacoustical transducer having a vibratable diaphragm for converting an input electrical signal into a corresponding acoustic output signal,
- an enclosure divided into at least first, second, third and fourth subchambers by at least first, second and third dividing walls,
- said first dividing wall supporting and coacting with said at least one electroacoustical transducer to bound said first and said second subchambers,
- at least one passive acoustic radiator specifically designed to realize a predetermined acousti mass and intercoupling said second and third subchambers,
- at least one additional passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling said third and fourth subchambers,
- at least a second additional passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling at least one of said second, third, or fourth subchambers with the region outside said enclosure,
- each of said second, third and fourth subchambers having the characterization of acoustic compliance,
- said passive acoustic radiator masses and said acoustic compliances selected to also establish a total of three spaced frequencies in the passband of said loudspeaker system,
- wherein said passive acoustic radiator has the characteristic of acoustic mass and being selected from the group consisting of vents, ports and suspended passive diaphragms,
- wherein said first subchamber is a closed box, acoustic suspension subchamber.
7 more elements
A loudspeaker system comprising:
- at least one electroacoustical transducer for converting an input electrical signal into a corresponding acoustic output,
- an enclosure divided into at least first portion of a first subchamber and second and third subchambers by at least first and second dividing walls,
- said first dividing wall supporting and coacting with said at least one electroacoustical transducer to bound said first portion of said first subchamber and said second subchamber,
- at least one passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling said second and third subchambers, at least one additional passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling at least one of said second and third subchambers with the region outside said enclosure,
- each of said second and third subchambers having the characterization of acoustic compliance,
- said passive acoustic radiator masses interacting with second and third subchamber compliances to form a total of two Helmholtz-reflex tunings at two spaced frequencies in the passband of said loudspeaker,
- said first portion of said first subchamber including mounting structure for attachment to an additional enclosed spaced that completes enclosure of said first subchamber as a substantially closed, acoustic suspension chamber.
4 more elements
A loudspeaker system comprising:
- at least one electroacoustical transducer including a vibratable diaphragm for converting an input electrical signal into a corresponding acoustic output signal,
- an enclosure divided into at least first portion of a first subchamber and second and third subchambers by at least first and second dividing walls,
- said first dividing wall supporting and coacting with said at least one electroacoustical transducer to bound said first portion of said first subchamber and said second subchamber,
- at least one passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling said second and third subchambers,
- at least one additional passive acoustic radiator specifically designed to realize a predetermined acoustic mass and intercoupling at least one of said second and third subchambers with the region outside said enclosure,
- each of said second and third subchambers having the characterization of acoustic compliance,
- said passive acoustic radiator masses interacting with second and third subchamber compliances to form a total of two Helmholtz-reflex tuning at two spaced frequencies in the passband of said loudspeaker,
- said first portion of said first subchamber being adapted to be mounted and operable in an enclosed spaced that completes enclosure of said subchamber as a substantially closed, acoustic suspension chamber.
5 more elements
Dependencies are inferred from the claim text.