ACOUSTIC SYSTEM - FUJIFILM CORP

Title:

ACOUSTIC SYSTEM

Document Type and Number:

WIPO Patent Application WO/2020/080112

Kind Code:

A1

Abstract:

This acoustic system comprises a cylindrical duct that allows a fluid to flow therethrough, an internal sound source arranged inside the upstream side of the duct or on an outer peripheral part of the duct that communicates with the inside of the upstream side of the duct or an external sound source located outside an end of the duct, and a film-like material that is formed as a part of the wall of the duct and vibrates in response to sound. The acoustic system creates an acoustic resonance through a structure including the film-like material and a closed space behind the film-like material so that sound propagating through the duct from a sound source and exiting from the end of the duct at the downstream side thereof is minimized, and the external sound source is located outside the end of the duct at a distance less than the wavelength of the acoustic resonance frequency from the end of the duct. By arranging a compact membrane-type resonance structure in a direction parallel to a flow passage in this acoustic system, wind will not directly hit the film surface perpendicularly thereto, and wind noise can be eliminated because there is no through-hole or aperture.

Inventors:

HAKUTA SHINYA (JP)
SUGAWARA YOSHIHIRO (JP)
OHTSU AKIHIKO (JP)
YAMAZOE SHOGO (JP)

Application Number:

PCT/JP2019/038953

Publication Date:

April 23, 2020

Filing Date:

October 02, 2019

Export Citation:

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Assignee:

FUJIFILM CORP (JP)

International Classes:

G10K11/172; G10K11/16

Domestic Patent References:

WO2018150828A1

2018-08-23

Foreign References:

JP2003083186A	2003-03-19
JP2004293365A	2004-10-21
JP2007321738A	2007-12-13
JP2001248418A	2001-09-14
JP4215790B2	2009-01-28
JP5499460B2	2014-05-21

Other References: