Nippon telegraph and telephone corporation (20250008254). ACOUSTIC SIGNAL OUTPUT DEVICE
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 20250008254 titled 'ACOUSTIC SIGNAL OUTPUT DEVICE
Original Abstract Submitted
an acoustic signal output device includes a driver unit and a housing that internally accommodates the driver unit. here, an acoustic signal emitted from the driver unit to one side is set as a first acoustic signal, and an acoustic signal emitted from the driver unit to another side is set as a second acoustic signal. a wall portion of the housing is provided with a single or plurality of first sound holes for leading out the first acoustic signal to an outside and a single or plurality of second sound holes for leading out the second acoustic signal to an outside. an attenuation rate of the first acoustic signal at a second point with reference to a predetermined first point, where the first acoustic signal arrives at the first point and the second point is farther from the acoustic signal output device than the first point, is equal to or less than a predetermined value smaller than an attenuation rate due to air propagation. 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.