JP2006177855A - 音響特性測定方法 - Google Patents
音響特性測定方法 Download PDFInfo
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- JP2006177855A JP2006177855A JP2004372909A JP2004372909A JP2006177855A JP 2006177855 A JP2006177855 A JP 2006177855A JP 2004372909 A JP2004372909 A JP 2004372909A JP 2004372909 A JP2004372909 A JP 2004372909A JP 2006177855 A JP2006177855 A JP 2006177855A
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Abstract
【解決手段】被測定物3の有無状態で、音波Wを発してリファレンスチャンネル6とテストチャンネル5とによって、音波Wを検知して、この両状態においてテストチャンネル5での取得データをリファレンスチャンネル6での取得データを基準として位相を合せて、相対値データとした周波数特性データを取得し、被測定物3がある状態での周波数特性データを無い状態での周波数特性データを基準に相対値化してから、逆FFT10によって時間領域データに変換してノイズデータを検出、除去した後にFFT9によって周波数特性データを得る。
【選択図】 図2
Description
2 音波データ処理装置
3 被測定物
4 送波部
5 テストチャンネル(受波部)
6 リファレンスチャンネル(受波部)
7 音響水槽
8 分配器
9 高速フーリエ変換器(FFT)
10 逆高速フーリエ変換器(逆FFT)
Claims (4)
- 被測定物が有る状態と無い状態とで、音波を発してリファレンスチャンネルとテストチャンネルとによって、前記音波を検知し、前記両状態において前記テストチャンネルによって取得したデータを前記リファレンスチャンネルで取得したデータを基準とし、位相を合わせ、相対値とした周波数特性データを取得するステップと、前記被測定物がある状態における周波数特性データを前記被測定物が無い状態における周波数特性データを基準にして相対値化するステップと、この相対値化した周波数特性データを時間領域データに変換してノイズデータを検出し、該ノイズデータを除去するステップとを有する音響特性測定方法。
- 前記ノイズを除去した時間領域データを周波数特性データに変換するステップを加えた請求項1に記載の音響特性測定方法。
- 前記音波を伝搬させて前記リファレンスチャンネルが検知する請求項1または2に記載の音響特性測定方法。
- 前記音波を伝送路によって伝送させて前記リファレンスチャンネルが検知する請求項1または2に記載の音響特性測定方法。
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JP2004372909A JP4572681B2 (ja) | 2004-12-24 | 2004-12-24 | 音響特性測定方法 |
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JP2004372909A JP4572681B2 (ja) | 2004-12-24 | 2004-12-24 | 音響特性測定方法 |
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JP2006177855A true JP2006177855A (ja) | 2006-07-06 |
JP4572681B2 JP4572681B2 (ja) | 2010-11-04 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105652263A (zh) * | 2016-03-07 | 2016-06-08 | 浙江大学 | 一种水声发射器声源级非自由场时反聚焦测量方法 |
CN109632071A (zh) * | 2018-11-08 | 2019-04-16 | 中国船舶重工集团公司七五0试验场 | 一种基于时频特征产生水声环境噪声数据的方法及装置 |
JP2019513217A (ja) * | 2015-08-12 | 2019-05-23 | ロス アラモス ナショナル セキュリティ リミテッド ライアビリティ カンパニー | マルチモード音響信号を用いた金属構造体における変化の検出および監視 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6293657A (ja) * | 1985-10-19 | 1987-04-30 | Nissan Motor Co Ltd | 路面状況検知装置 |
JPH09133660A (ja) * | 1995-11-08 | 1997-05-20 | Yokohama Rubber Co Ltd:The | 水中音響透過材料の透過損失計測方法及びその装置 |
JP2000304730A (ja) * | 1999-04-19 | 2000-11-02 | Ono Sokki Co Ltd | 音響特性測定装置および音響特性測定方法 |
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2004
- 2004-12-24 JP JP2004372909A patent/JP4572681B2/ja active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6293657A (ja) * | 1985-10-19 | 1987-04-30 | Nissan Motor Co Ltd | 路面状況検知装置 |
JPH09133660A (ja) * | 1995-11-08 | 1997-05-20 | Yokohama Rubber Co Ltd:The | 水中音響透過材料の透過損失計測方法及びその装置 |
JP2000304730A (ja) * | 1999-04-19 | 2000-11-02 | Ono Sokki Co Ltd | 音響特性測定装置および音響特性測定方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019513217A (ja) * | 2015-08-12 | 2019-05-23 | ロス アラモス ナショナル セキュリティ リミテッド ライアビリティ カンパニー | マルチモード音響信号を用いた金属構造体における変化の検出および監視 |
CN105652263A (zh) * | 2016-03-07 | 2016-06-08 | 浙江大学 | 一种水声发射器声源级非自由场时反聚焦测量方法 |
CN109632071A (zh) * | 2018-11-08 | 2019-04-16 | 中国船舶重工集团公司七五0试验场 | 一种基于时频特征产生水声环境噪声数据的方法及装置 |
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