18706627. ACOUSTIC SIGNAL OUTPUT DEVICE (NIPPON TELEGRAPH AND TELEPHONE CORPORATION)
ACOUSTIC SIGNAL OUTPUT DEVICE
Organization Name
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor(s)
Kazunori Kobayashi of Tokyo (JP)
ACOUSTIC SIGNAL OUTPUT DEVICE
This abstract first appeared for US patent application 18706627 titled 'ACOUSTIC SIGNAL OUTPUT DEVICE
Original Abstract Submitted
Provided is an acoustic signal output device including a single or plurality of driver units, a first housing portion in which a wall portion is provided with a single or plurality of first sound holes for leading out a first acoustic signal emitted from one of the driver units to an outside and a single or plurality of second sound holes for leading out a second acoustic signal emitted from one of the driver units to an outside, and a second housing portion in which a wall portion is provided with a single or plurality of third sound holes for leading out a third acoustic signal emitted from one of the driver units to an outside and a single or plurality of fourth sound holes for leading out a fourth acoustic signal emitted from one of the driver units to an outside. Here, an attenuation rate of the first acoustic signal at a farther second point with reference to a first point is equal to or less than a predetermined value smaller than an attenuation rate due to air propagation of an acoustic signal at the second point with reference to the first point. Alternatively, an attenuation amount of the first acoustic signal at the second point with reference to the first point is equal to or more than a predetermined value larger than an attenuation amount due to air propagation of an acoustic signal at the second point with reference to the first point.
