| 胎心音检测系统中滤波电路的设计 |
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| 引用本文： | 刘艳芳,高国伟.胎心音检测系统中滤波电路的设计[J].传感器与微系统,2006,25(12):46-47. |
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| 作者姓名： | 刘艳芳 高国伟 |
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| 作者单位： | 北京信息工程学院,电子信息工程系,北京,100101 |
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| 摘 要： | 胎心音检测在胎儿监护中占有极其重要的地位。胎心音的主要频率范围集中在60~180Hz,因此在对信号进行A/D采样之前,应先设计滤波电路,滤除50Hz工频的谐波分量以及母体噪音。滤波电路采用OPA2277双运放芯片,设计具有正反馈的双T型陷波器滤除工频谐波,利用巴特沃斯滤波原理设计高通滤波器和低通滤波器滤除母体噪音。通过Mu ltisim软件对所设计的陷波电路和滤波电路进行频响特性仿真,得到的频响特性曲线表明:所设计电路可成功滤掉工频干扰和母体噪音干扰。
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| 关 键 词： | 胎心音 陷波器 巴特沃斯滤波器 |
| 文章编号： | 1000-9787（2006）12-0046-02 |
| 收稿时间： | 2006-11-09 |
| 修稿时间： | 2006年11月9日 |
Design of filter circuit in the system of detecting fetal heart sound |
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| LIU Yan-fang,GAO Guo-wei.Design of filter circuit in the system of detecting fetal heart sound[J].Transducer and Microsystem Technology,2006,25(12):46-47. |
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| Authors: | LIU Yan-fang GAO Guo-wei |
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| Affiliation: | Deartment of Electronic Engineering, Beijing Information and Technology Institute, Beijing 100101, China |
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| Abstract: | The detecting fetal heart sound plays an important role in monitoring fetal.The major frequency range of the fetal heart sound focus on 60~180 Hz.Before sampling the fetal heart sound,it is need to design filter circuit to percolate the syntonic of 50 Hz power frequency and the noise of the matrix.The filter fircuit uses chip OPA2277.A double-T frame trap filter which contains a positive feedback is designed percolate syntonic of power frequency.Base on Butterworth function a high-pass and a low-pass filter is designed to percolate the noise of matrix.Simulation of the frequency response characteristic by the software Multisim indicate that the filter could percolate the power frequency and the noise of matrix. |
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| Keywords: | fetal heart sound trap filter Butterworth filter |
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