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US 8,798,302 B2Granted
Flat panel loudspeakers
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsLutz Ehrig, Daniel Beer
Life of this patent
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Abstract
A flat panel loudspeaker with such an emission characteristic is obtained which, in the event of the flat panel loudspeaker being set up inversely, provides an improved listening result in that a loudspeaker is provided within the housing, and a sound conduction is configured such that sound from the loudspeaker is conducted outward via an acoustic aperture within the housing for undirected emission.
Claims27
A flat panel loudspeaker comprising
- a housing comprising a front side and a rear side;
- a high-frequency loudspeaker within the housing;
- and
- a mid- or low-frequency loudspeaker arranged so as to emit outwardly away from the rear side of the housing;
- and
- a sound conduction configured to conduct sound from the high-frequency loudspeaker via an acoustic aperture within the housing outwards,
- wherein the acoustic aperture is formed in a lateral side of the housing extending between, and connecting, the front side and the rear side, in form of a series of holes or in form of a slit in the lateral side, wherein a longitudinal extension of the series of holes or the slit extends circumferentially with respect to the front and rear sides and a width of the series of holes or the slit in a thickness direction via which front and rear sides are distanced from each other is smaller than a wavelength of a highest frequency of the sound from the high-frequency loudspeaker so that the sound emitted by the high-frequency loudspeaker is radiated from the acoustic aperture in a plane perpendicular to the longitudinal direction in a nearly equiangular manner so that a perceivable portion of the sound emitted by the high-frequency loudspeaker propagates into a direction into which the front side of the housing faces.
4 more elements
The flat panel loudspeaker as claimed in any of the previous claims, wherein a diaphragm normal of the high-frequency loudspeaker points toward the interior of the housing, so that the high-frequency loudspeaker emits the sound into the sound conduction within the housing.
A flat panel loudspeaker comprising
- a housing;
- a loudspeaker within the housing;
- and
- a sound conduction configured to conduct sound outward from the loudspeaker via an acoustic aperture within the housing for undirected emission,
- wherein the loudspeaker is a high-frequency loudspeaker, the diaphragm normal of which points toward the interior of the housing, so that the high-frequency loudspeaker emits the sound into the sound conduction within the housing, and
- wherein the flat panel loudspeaker further comprises a mid- or low-frequency loudspeaker, a diaphragm normal of the mid- and/or low-frequency loudspeaker pointing away from the housing, inversely to the diaphragm normal of the high-frequency loudspeaker, so that the high-frequency loudspeaker emits the sound into the sound conduction within the housing, and the mid- and/or low-frequency loudspeaker emits sound away from the housing.
3 more elements
A flat panel loudspeaker comprising
- a housing;
- a loudspeaker within the housing;
- and
- a sound conduction configured to conduct sound outward from the loudspeaker via an acoustic aperture within the housing for undirected emission,
- wherein the acoustic aperture is formed laterally within the housing, an outwardly emitting loudspeaker being formed within a front side of the housing adjacently to the acoustic aperture and being controlled with a first high-tone signal that is offset in phase relative to a second high-tone signal with which the loudspeaker within the housing is controlled, so as to effect destructive superposition with sound of the loudspeaker within the housing, said sound leaving the acoustic aperture in a direction in which the front side is pointing.
2 more elements
A flat panel loudspeaker comprising
- a housing comprising a front side and a rear side;
- a high-frequency loudspeaker within the housing;
- and
- a mid- or low-frequency loudspeaker arranged so as to emit outwardly away from the rear side of the housing;
- and
- a sound conduction configured to conduct sound from the high-frequency loudspeaker via an acoustic aperture within the housing outwards,
- wherein the high-frequency loudspeaker is formed by electro-acoustical transducers arranged along a line so as to form a line sound source, and the acoustic aperture is formed in a lateral side of the housing extending between, and connecting, the front side and the rear side, in form of a series of holes or in form of a slit in the lateral side along which a longitudinal axis of the line sound source extends so that sound emitted by the high-frequency loudspeaker is radiated from the acoustic aperture nearly circularly in a plane perpendicular to the line along which the electro-acoustical transducers are arranged.
4 more elements
Dependencies are inferred from the claim text.