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公开(公告)号：US20220341772A1
公开(公告)日：2022-10-27
申请号：US17762462
申请日：2020-09-25
摘要： This signal processing device comprises: an acquisition unit for acquiring an acoustic signal; a measurement unit for measuring an acoustic level of the acoustic signal for every one of first frequency bands, which are a plurality of frequency bands of a preset first bandwidth; a calculation unit that, on the basis of the plurality of acoustic levels of the first frequency bands, identifies an acoustic feature quantity indicating the separation degree from normal acoustic levels of second frequency bands, which are a plurality of frequency bands of a second bandwidth that is wider than the first bandwidth; a first determination unit for determining whether the acoustic levels measured for every one of the first frequency bands are a first threshold value or greater; and a second determination unit for determining whether the acoustic feature quantity is a second threshold value or greater.
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公开(公告)号：US20160376930A1
公开(公告)日：2016-12-29
申请号：US15038921
申请日：2014-06-16
发明人： Hiroyuki HOSOYA , Toshifumi KUDO , Takuro KODA
CPC分类号： F01D25/30 , F02C7/045 , F04D17/122 , F04D29/4213 , F04D29/665 , F05D2260/963 , G10K11/161
摘要： Provided are: a muffler that can suitably obtain an attenuation effect of a sound wave; and a muffling device including the same. The muffler is installed on a wall surface of a pipe conduit where a gas flows. The muffler includes: a front surface exposed to an inner surface of the pipe conduit; a bottom surface facing the front surface; and a side surface disposed between the front surface and the bottom surface and covering a space between the front surface and the bottom surface. The front surface is formed with a plurality of through-holes, and the number of through-holes arrayed in a gas flow direction is one or two, and the number thereof arrayed in a direction orthogonal to the gas flow direction is 10 or more.
摘要翻译： 提供：可以适当地获得声波的衰减效果的消音器; 以及包括该消音装置的消音装置。 消声器安装在气体流动的管道导管的壁面上。 消声器包括：暴露于管道管道内表面的前表面; 面向前表面的底面; 以及设置在前表面和底表面之间并且覆盖前表面和底表面之间的空间的侧表面。 前表面形成有多个通孔，并且沿气体流动方向排列的通孔的数量为一个或两个，并且在与气体流动方向正交的方向上排列的数量为10个以上。
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公开(公告)号：US20220381169A1
公开(公告)日：2022-12-01
申请号：US17731619
申请日：2022-04-28
发明人： Yoshiko TAKEI , Toshifumi KUDO
IPC分类号： F01N1/06
摘要： A sound pressure generator includes a tube portion having a flow path extending in a tube axial direction; a rotor having a columnar shape with a column axis extending in a direction intersecting the tube axial direction in the flow path, the rotor configured to generate sound pressure by rotating about the column axis; and a drive unit configured to drive the rotor, wherein a cross-sectional shape of the rotor sectioned across the column axis includes a pointed first tip, a pointed second tip, and a long axis along which the first tip and the second tip are aligned.
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公开(公告)号：US20200208655A1
公开(公告)日：2020-07-02
申请号：US16726358
申请日：2019-12-24
发明人： Toshifumi KUDO , Takaya KODA , Yuichiro SAWADA , Yoshiko TAKEI
摘要： A centrifugal compressor includes one or more impellers, a casing which covers the one or more impellers, and a silencer. The casing includes a radial passage which guides a gas flowing out from a final stage impeller to a radially outer side, and an outlet scroll passage which communicates the radial passage with an outlet. The silencer includes a perforated plate in which a plurality of acoustic holes are formed, and a space forming body which forms an acoustic space connected to the plurality of acoustic holes. A first surface of the silencer opposite to a surface of the perforated plate defining the acoustic space forms at least part of an inner surface of the casing which defines the outlet scroll passage.
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