US2008130922
The present invention is directed to providing a sound field reproduction system that can enhance the sound separation between the front and rear seats or left and right seats of a vehicle. The sound field reproduction system includes a control unit for creating a first sound signal and a second sound signal from one or a plurality of sources, a narrow-directional speaker mounted on the front seat side of the vehicle, a speaker mounted on the rear seat side of the vehicle, and a signal processing unit for driving the narrow-directional speaker based on the first sound signal that has been processed according to frequency range, and for driving the speaker based on the second sound signal.
US2008128201
A sound absorbing structure having excellent in sound absorbing performance, which is capable of achieving 0.4 or higher in the sound absorbing coefficient even in the case where a perforated panel is a thin plate such as aluminum foil within a range where a reduction in the weight of a vehicle body is not impaired and through holes have a large hole diameter in order to make the processing of providing a large number of through holes in the perforated panel. The sound absorbing structure 1 is the sound absorbing structure 1 for suppressing noise generated on a sound source side, which is equipped with: a perforated panel 2 having a large number of through holes 3 and a fiber material 4 , which are provided so as to face the sound source side and provided so as to overlap with each other; and an air layer 5 provided behind the perforated panel 2 , in which the density and the thickness of the fiber material 4 and the hole diameter and the aperture rate of the through holes 3 of the perforated panel 2 severally have a specific relationship.
US2008130938
The invention discloses a flush type rotatable sound box comprising a body case and the loudspeaker system inside the case. The mentioned body case is flush-mounted in wall or ceiling with a revolving gear joining to them. The sound box of this invention saves space and beautifies the indoor environment. The angle of the sound box can be changed depending on user's listening habit and the requirements of sound field by controlling the revolving gear. When the sound box is not to be used, it can be rotated by 180 DEG with the revolving gear in order to keep it in wall or suspended ceiling and to reveal its back. A lighting devices or decoration may be fixed to the back of the sound box upon user's request.
US2008130933
A loudspeaker system includes a loudspeaker, a sound wave guiding portion that has an opening portion, and guides a sound emitted from the loudspeaker to radiate the sound from the opening portion, and a thermal change portion that is provided on the sound wave guiding portion to form a temperature gradient in a space in the sound wave guiding portion.
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