Title:
ACOUSTIC APPARATUS
Document Type and Number:
WIPO Patent Application WO/2023/181832
Kind Code:
A1
Abstract:
This acoustic apparatus 1 comprises: a housing 2; an acoustic tube 3 having an inside open end 31 that opens to the interior of the housing 2 and an outside open end 32 that opens to the exterior of the housing 2, the acoustic tube 3 having a primary resonance frequency close to the frequency of a standing wave occurring in the housing 2; and a sound-absorbing material 4 provided in a region in the interior of the housing 2 but outside of the acoustic tube 3, the sound-absorbing material 4 being disposed at a position set apart by approximately λ/4 from a first surface 21 of the housing 2 in the direction of propagation, where λ is a wavelength at a resonance frequency generated by coupling the primary resonance of the acoustic tube 3 and the standing wave occurring in the housing 2, and the direction of propagation is a direction in which the standing wave propagates in the interior of the housing 2.
Inventors:
TABATA RYOYA (JP)
UCHIDA KATSUYA (JP)
HONJI YOSHIKAZU (JP)
UCHIDA KATSUYA (JP)
HONJI YOSHIKAZU (JP)
Application Number:
PCT/JP2023/007798
Publication Date:
September 28, 2023
Filing Date:
March 02, 2023
Export Citation:
Assignee:
YAMAHA CORP (JP)
International Classes:
H04R1/02; H04R1/28
Foreign References:
| JP2016025410A | 2016-02-08 | |||
| JPS5829292A | 1983-02-21 | |||
| JP2019186879A | 2019-10-24 | |||
| JP2009118182A | 2009-05-28 |
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