Acoustic waveguiding
First Claim
1. An apparatus comprisinga trunk acoustic waveguide section having a free end, andbranch acoustic waveguide sections each having a junction end coupled to the trunk and a terminal end to receive an acoustic energy source, lengths of the branch acoustic waveguide sections being substantially the same,at least one of the waveguide sections having a cross-sectional area that varies along at least a portion of a length of the at least one of the waveguide sections, including at least one location other than ends of the at least one of the waveguide sections.
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Accused Products
Abstract
An acoustic waveguide system contains a trunk waveguide and a number of branch waveguides. The trunk waveguide section defines an interior passage and includes at least one open end. A number of branch waveguide sections define an interior passage and include a junction end and a terminal end, with the junction end coupled to the trunk waveguide. One or more cavities can be coupled to at least one of the trunk or branch sections and communicate therewith through a vent for damping the resonance peak of a target standing wave.
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Citations
53 Claims
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1. An apparatus comprising
a trunk acoustic waveguide section having a free end, and branch acoustic waveguide sections each having a junction end coupled to the trunk and a terminal end to receive an acoustic energy source, lengths of the branch acoustic waveguide sections being substantially the same, at least one of the waveguide sections having a cross-sectional area that varies along at least a portion of a length of the at least one of the waveguide sections, including at least one location other than ends of the at least one of the waveguide sections.
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21. An acoustic waveguide system comprising
a trunk waveguide section having a single free end, and a cross-sectional area that progressively increases along a length of the trunk waveguide section from the free end; -
first and second branch waveguide sections coupled to the trunk waveguide section at locations other than the free end; and each of the first and second waveguide sections having a terminal end acoustically coupled to an acoustic energy source including at least one acoustic driver, at least one of the waveguide sections having a cross-sectional area that varies along at least a portion of a length of the at least one of the waveguide sections, length including at least one location other than ends of the at least one of the waveguide sections. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An audio player comprising
a housing, an electronic audio circuit, an acoustic energy source coupled to the electronic audio circuit, and a waveguide structure comprising a trunk acoustic waveguide section having a free end, and a plurality of branch acoustic waveguide sections each having a junction end coupled to the trunk and a terminal end to receive an acoustic energy source, lengths of the branch acoustic waveguide sections being substantially the same, at least one of the waveguide sections having a cross-sectional area that varies along at least a portion of a length of the at least one of the waveguide sections, length including at least one location other than ends of the at least one of the waveguide sections.
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37. An electroacoustical waveguide transducing system comprising
a trunk acoustic waveguide section having a free end, first and second branch acoustic waveguide sections each having a junction end coupled to the trunk and a terminal end to receive an acoustic energy source, and an elongate cavity defining a volume substantially smaller than the volume of the trunk and branch sections, the cavity linked to at least one of the branch sections and trunk section by an aperture, the aperture being located proximate a junction of at least two of the branch sections and truck section, and first and second acoustic energy sources coupled to the terminal ends of the first and second branch waveguide sections and comprising first and second acoustic drivers each comprising a first radiating surface acoustically coupled to the terminal ends of the first and second sections and a second radiating surface facing the free air, at least one of the waveguide sections having a cross-sectional area that varies along at least a portion of a length of the at least one of the waveguide sections, length including at least one location other than ends of the at least one of the waveguide sections.
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41. An apparatus comprising
an acoustic waveguide system having a tree-structure and comprising: -
a first number of open end root nodes, a second number of terminal end leaf nodes, and the first number of open end root nodes being connected to the second number of terminal end leaf nodes via a plurality of internal waveguide sections and a third number of internal nodes, wherein lengths of the plurality of internal waveguide sections are substantially the same, and wherein each one of the second number of terminal leaf nodes is acoustically coupled to an acoustic energy source, at least one of the waveguide sections having a cross-sectional area that varies along at least a portion of a length of the at least one of the waveguide sections, length including at least one location other than at ends of the at least one of the waveguide sections. - View Dependent Claims (42, 43, 44, 45, 46, 47)
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48. An apparatus comprising
a trunk acoustic waveguide section having a free end, first and second branch acoustic waveguide sections each having a junction end coupled to the trunk and a terminal end to receive an acoustic energy source, and an elongate cavity defining a volume substantially smaller than the volume of the trunk and branch sections, the cavity attaching to at least one of the branch sections and trunk section via a vent which forms an aperture between the sections and the cavity, wherein the elongate cavity is sized and the vent is positioned along at least one of the branch and trunk sections to substantially reduce a resonance peak, at least one of the waveguide sections having a cross-sectional area that varies along at least a portion of a length of the at least one of the waveguide sections, length including at least one location other than ends of the at least one of the waveguide sections.
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51. An electroacoustical waveguide transducing system comprising
a waveguide having a free end and a terminal end, first and second branch acoustic waveguide sections each having a junction end coupled to the terminal end of the waveguide and a terminal end to receive an acoustic energy source, first and second acoustic drivers each comprising a first radiating surface acoustically coupled to the terminal ends of the first and second sections and a second radiating surface facing the free air, and an elongate cavity having a length of about one quarter of the wavelength of a target standing wave within the waveguide and defining a volume substantially smaller than the volume of the waveguide, the cavity attaching to the waveguide via a vent, the vent located at a point along the length of the waveguide corresponding or close to the pressure maximum of the target standing wave, the waveguide having a cross-sectional area that varies along at least a portion of its length including at least one location other than near an end of the waveguide, and a relationship between a cross-sectional area of the free end, A and a wavelength of sound at a low frequency cutoff of the waveguide, λ - is given by;
(√
A)/λ
≦
0.067. - View Dependent Claims (52, 53)
- is given by;
Specification