Acoustic transducer structures
AssigneeUltraleap Limited
InventorsBrian Kappus, Benjamin John Oliver Long
Life of this patent
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Abstract
Defining critical spacing is necessary for steering of parametric audio. Comparing steering measurements both with and without a waveguide leads to a conclusion that the diffuse phyllotactic grating lobe contributes audio and is to blame for poor steering. In addition, the waveguide needs to function with correct phase offsets to achieve the steering required for performance. Arranging tubes so that the array configuration changes from rectilinear to another distribution is useful when the waveguide is short of critical spacing or constrained for space. Array designs may also capitalize on rectilinear transducer design while having the benefits of a transducer tiling that has irrational spacing to promote the spread of grating lobe energy.
Claims20
An array of triangular transducers, wherein the locations of physical features can be described by barycentric coordinates applied to a triangle with sides forming the ratio 1:2:√5.
An array comprising:
- at least one tile of transducers, wherein each of the at least one tile of transducers comprises a plurality of square transducers in a partial phyllotactic spiral pattern;
- wherein two opposite corners of a transducer and a point in space common to an acoustic transducer elements on the at least one of the tile of transducers are collinear.
A device comprising:
- at least one asymmetric acoustic transducer;
- wherein a field generated at a plurality of frequencies from a plurality of stable asymmetric resonant modes is used to localize a transducer detecting the field at the plurality of frequencies.
An array comprising:
- a plurality of tiles comprising of a plurality of transducers;
- wherein physical transducer locations are perturbed through rigid transformations such that a new footprint of each element intersects the footprint before the transformation is applied,
- wherein the original footprint of each element comprises a uniform layout of acoustic transducers.
Dependencies are inferred from the claim text.