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US 11,153,681 B2Granted
Acoustic direction sensor
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorsTaehwa Lee, Hideo Iizuka
Life of this patent
Estimating the term…
Abstract
Sound direction detection devices include cylinders or other longitudinally extended structures having rotational symmetry about their longitudinal axes and multiple, rotationally equivalent resonators contained therein. Each resonator contains a microphone or other transducer that is activated when the resonator resonates.
Claims15
A sound direction sensor, comprising:
- a first Helmholtz resonator comprising:
- at least one exterior wall defining a first acoustic chamber, and
- a first neck placing the first acoustic chamber in fluid communication with an ambient environment, the first neck pointing in a first direction;
- a first microphone positioned in the first acoustic chamber away from the at least one exterior wall;
- a second Helmholtz resonator having:
- a second acoustic chamber defined by the at least one exterior wall, and
- a second neck placing the second acoustic chamber in fluid communication with the ambient environment, the second neck pointing in a second direction different from the first direction;
- a second microphone positioned in the second acoustic chamber away from the at least one exterior wall;
- and
- wherein the first and second Helmholtz resonators are collinear with respect to each other.
7 more elements
A sound direction sensor comprising:
- at least one exterior wall defining a hollow longitudinal structure having a longitudinal axis and n-fold rotational symmetry about the longitudinal axis, where n is an integer equal to or greater than two;
- n rotationally equivalent Helmholtz resonators contained in the hollow longitudinal structure, each of the n rotationally equivalent Helmholtz resonators comprising:
- an acoustic chamber bounded by the at least one exterior wall, and
- a neck placing the acoustic chamber in fluid communication with an ambient environment;
- a microphone contained in the acoustic chamber away from the at least one exterior wall;
- and
- wherein the n rotationally equivalent Helmholtz resonators are collinear with respect to each other.
4 more elements
Dependencies are inferred from the claim text.