JP5593289B2 - 交流雑音の除去方式及び装置 - Google Patents
交流雑音の除去方式及び装置 Download PDFInfo
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Description
6 加算器 8 演算器
12 前置増幅器 14 低域通過フィルタ
16 A/D変換器 18 演算器
20 低域通過フィルタ 22 A/D変換器
24 デジタルフィルタ 26 適応アルゴリズム
30 マスク信号出力部
Claims (6)
- 一過性のパルス状信号を含む主入力信号に混入する交流雑音信号を、入力される信号の性質に依存して逐次適応的にフィルタ係数を変化させながら線形フィルタリング処理する適応フィルタにて除去せしめるに際し、
前記パルス状信号の持続する間は、前記適応フィルタのフィルタ係数を規定する、前記交流雑音信号の自己相関及び前記主入力信号と該交流雑音信号との相互相関の更新を行なわずに、該フィルタ係数が、かかる更新停止直前の値に固定されるようにして、前記適応フィルタの動作を継続することにより、前記主入力信号から前記交流雑音信号を除去するようにしたことを特徴とする交流雑音の除去方式。 - 前記パルス状信号の持続する間が、該パルス状信号の発生時点から200〜300msec経過するまでの間である請求項1に記載の交流雑音の除去方式。
- 一過性のパルス状信号に交流雑音信号が混入した電気信号を取り出して加工し、デジタル化して、主入力信号として出力する主入力信号加工部と、
交流雑音発生源から信号を取得して加工し、デジタル化して、交流雑音信号に係る参照信号として出力する参照信号作成部と、
かかる参照信号の自己相関及び前記主入力信号と該参照信号との相互相関にて規定されるフィルタ係数を、入力信号の性質に依存して逐次適応的に変化させながら、前記参照信号作成部から出力された参照信号を線形フィルタリング処理する適応フィルタ部と、
前記パルス状信号の発生から、それが持続している間、該適応フィルタ部における前記自己相関と相互相関の更新を停止せしめて、前記フィルタ係数が、該更新停止直前の値に固定されるようにして、前記適応フィルタ部の動作が継続されるようにするマスク信号を出力するマスク信号出力部と、
前記主入力信号加工部より出力される主入力信号から、前記適応フィルタ部において該マスク信号に基づいて線形フィルタリング処理された参照信号を差し引き、前記混入した交流雑音が除去された電気信号を出力する加減演算部とを、
有することを特徴とする交流雑音の除去装置。 - 前記電気信号が、生体に装着された電極より取り出される、商用交流電源に起因する雑音の混入した微弱電位からなる生体電気信号であり、前記交流雑音発生源が、商用交流電源である請求項3に記載の交流雑音の除去装置。
- 前記一過性のパルス状信号が、網膜電位図測定におけるフラッシュ光照射にて生じた網膜の活動電位である請求項3又は請求項4に記載の交流雑音の除去装置。
- 前記マスク信号出力部が、前記パルス状信号の発生の情報を直接的に又は間接的に取得して、前記マスク信号を出力する請求項3乃至請求項5の何れか1項に記載の交流雑音の除去装置。
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WO2015064313A1 (ja) | 2013-10-31 | 2015-05-07 | 株式会社村田製作所 | 生体情報計測装置 |
JP6933789B2 (ja) * | 2018-04-28 | 2021-09-08 | 哲 八子 | 直熱真空管パワーアンプのハム雑音低減装置 |
JP7252086B2 (ja) * | 2019-07-29 | 2023-04-04 | アルパイン株式会社 | 適応同定システム、適応同定装置、及び適応同定方法 |
US11488619B2 (en) * | 2019-08-15 | 2022-11-01 | James K. Waller, Jr. | Adaptive dynamic audio hum extractor and extraction process |
CN111756352B (zh) * | 2020-05-18 | 2022-08-19 | 北京大学 | 脉冲阵列时域滤波方法、装置、设备及存储介质 |
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