Loudspeaker system
AssigneeU.S. Philips Corporation
InventorsJoris A. M. Nieuwendijk, Johannes W. T. Bax, Martinus P. M. Van Den Thillart
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Abstract
An enclosure (35) of a loudspeaker (37) is provided with a plurality of tubes (43) of different length via which the sound is emitted in order to achieve frequency spreading of resonance peaks in the SPL (sound pressure level) curve. The side walls (46, 47) of the tubes (43) have openings (63) via which the tubes are coupled to common Helmholtz resonators (59, 61) in order to suppress undesirable resonances in the tubes (43). By spreading the resonance peaks it is possible to use Helmholtz resonators of smaller dimensions than in the case that the sound would emanate via a single tube. This results in a loudspeaker system (33) with more compact and cheaper Helmholtz resonators (59, 61).
Claims6
A loudspeaker system comprising an enclosure, a loudspeaker arrangement accommodated in the enclosure, a first tube having one end connected to the enclosure, a first volume bounded by the first tube and communicating with a volume bounded by the enclosure, and a first acoustic damping chamber connected to the first tube and bounding a volume which communicates with the first volume bounded by the first tube, characterized in that the loudspeaker system comprises at least a second tube having a different length than said first tube and having one end connected to the enclosure, a second volume bounded by the second tube communicating with the volume bounded by the enclosure, and the second tube is connected to the first acoustic damping chamber, the volume bounded by the second tube also communicating with the volume bounded by the first acoustic damping chamber.
Dependencies are inferred from the claim text.