Title:
ACOUSTIC SIGNAL OUTPUT DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/188345
Kind Code:
A1
Abstract:
This acoustic signal output device comprises a driver unit and a housing in which the driver unit is accommodated. An acoustic signal emitted to one side from the driver unit is taken as a first acoustic signal, and an acoustic signal emitted to the other side from the driver unit is taken as a second acoustic signal. A first sound hole through which the first acoustic signal is led outside and a second sound hole through which the second acoustic signal is led outside are provided in a wall part of the housing.
In addition, provided is a waveguide for adjusting at least one of a path length from the position of the driver unit to the position at which the first acoustic signal is emitted outside, or a path length from the position of the driver unit to the position at which the second acoustic signal is emitted outside. On the basis of a predetermined first point reached by the first acoustic signal, an attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than the first point is equal to or smaller than a predetermined value that is smaller than an attenuation rate caused by air propagation. Or the attenuation rate of the first acoustic signal at the second point based on the first point is equal to or greater than a predetermined value greater than the attenuation rate caused by air propagation.
Inventors:
CHIBA HIRONOBU (JP)
KAKO TATSUYA (JP)
KAKO TATSUYA (JP)
Application Number:
PCT/JP2022/016739
Publication Date:
October 05, 2023
Filing Date:
March 31, 2022
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04R1/28; H04R1/10
Foreign References:
| CN112738680A | 2021-04-30 | |||
| US20210067858A1 | 2021-03-04 | |||
| US20100080400A1 | 2010-04-01 | |||
| US20210289281A1 | 2021-09-16 | |||
| JP2019537389A | 2019-12-19 |
Attorney, Agent or Firm:
NAKAO, Naoki et al. (JP)
Download PDF: