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CN103222863B - Array based fetal heart monitor athletic piezoelectric film sensor - Google Patents

Array based fetal heart monitor athletic piezoelectric film sensor Download PDF

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CN103222863B
CN103222863B CN 201310191335 CN201310191335A CN103222863B CN 103222863 B CN103222863 B CN 103222863B CN 201310191335 CN201310191335 CN 201310191335 CN 201310191335 A CN201310191335 A CN 201310191335A CN 103222863 B CN103222863 B CN 103222863B
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CN 201310191335
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CN103222863A (en )
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樊家良
杨强
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哈尔滨工业大学
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Abstract

一种基于压电薄膜传感器的阵列式胎心监测腹带,本发明涉及对胎儿心脏的监测领域。 Array based fetal heart monitor athletic piezoelectric film sensor, the present invention relates to the field of fetal heart monitor. 它是为了解决现有胎心监测多是利用胎心音听诊器、超声多普勒胎音仪、单个传感器来进行胎心监测,它们存在误差大或属于“入侵式”的监测或精度低的问题。 It is to solve the conventional multi-fetal heart monitor fetal heart sounds using the stethoscope, Doppler fetal tone instrument, a single sensor to monitor the fetal heart rate, they are of a low error is large or "invasive" or monitoring accuracy problems. 它的腹带的两端部上分别设置有魔术贴,压电薄膜传感器阵列设置在腹带的中部;检测电路设置在腹带上;所属检测电路由前置差分放大电路、滤波电路、模/数转换电路、DSP模块、存储器模块、接口模块组成。 Which are provided on both ends of the Velcro cummerbund, the piezoelectric film sensor array disposed in the middle of the bellyband; a detection circuit disposed on a bellyband; detection circuit relevant to the pre-amplified by a differential circuit, a filter circuit, an analog / digital conversion circuitry, DSP blocks, the memory module, the interface module. 本发明所采用的压电薄膜传感器具有响应速度快、灵敏度高和线性度好的优点,能够保证检测的准确性;由于压电薄膜传感器质量小,柔软,耐用,其嵌入腹带后能够很好的与人体贴合,人机功效良好。 Piezoelectric film sensor used in the present invention has a fast response, high sensitivity and good linearity advantages, to ensure the accuracy of detection; piezoelectric film sensor due to the small mass of soft, durable, well after athletic embedded combined with thoughtful people, good ergonomics.

Description

一种基于压电薄膜传感器的阵列式胎心监测腹带 Array based fetal heart monitor athletic piezoelectric film sensor

技术领域 FIELD

[0001 ]本发明涉及对胎儿心脏的监测领域。 [0001] The present invention relates to the field of fetal heart monitor.

背景技术 Background technique

[0002] 胎心监护在以往仅用于推测胎儿是否存活,现在则通过胎心监测,可以诊断胎儿能量储备能力和胎儿健康状况。 [0002] fetal heart rate monitoring in the past only to speculate whether the fetus survived, and now through the fetal heart monitor, diagnose fetal energy reserve capacity and fetal health. 胎心监测不仅可以诊断胎儿心脏功能,还可以诊断胎儿中枢神经系统功能,避免妊娠妇女子宫环境恶化对胎儿中枢神经造成不可挽回的损伤。 Not only can diagnose fetal heart monitor fetal heart function, you can also diagnose fetal central nervous system function, pregnant women avoid uterine environmental degradation caused irreparable damage to the fetal central nervous system. 胎心率是胎心监测的一个重要指标。 Fetal heart rate is an important indicator of fetal heart monitoring.

[0003] 早期的胎心监测多是利用胎心音听诊器来测量胎心率,存在误差大、抗干扰能力差,需要医生或者妊娠妇女手动操作的缺点。 [0003] Multi early fetal heart monitor fetal heart sounds using a stethoscope to measure fetal heart rate, there is a large error, anti-interference ability, pregnant women need a doctor or disadvantages manually. 目前在医院中广泛使用超声多普勒胎音仪作为胎心监测手段,这种方法主要原理是借助仪器主动发送超声波作用于胎儿,从胎儿各种组织对超声波的不同反射信号来获取胎心信息。 Widely used Doppler fetal tone instrument in hospital as a means of monitoring fetal heart rate, this method is the main principle is to take the initiative to send the aid of ultrasonic instrumentation in the fetus, fetal heart rate information to obtain different reflected signal fetal ultrasound from a variety of organizations. 显然,这是一种"入侵式"的监测方法。 Obviously, this is a kind of "intrusive" monitoring methods. 采用这种方法对胎儿进行持续监测安全性未知,存在对母体和胎儿的潜在危害。 The methodology for continuous monitoring of the safety of the fetus is unknown, there is potential harm to the mother and fetus. 采用单个传感器的胎心监测设备精度较低,测量结果受母体影响较大,并且不能对胎儿心脏位置做出估计。 Using a single sensor fetal heart monitoring device accuracy is low, the measurement results influenced by the parent, and not to estimate the location of the fetal heart.

发明内容 SUMMARY

[0004] 本发明的目的是提供一种基于压电薄膜传感器的阵列式胎心监测腹带,为了解决现有胎心监测多是利用胎心音听诊器、超声多普勒胎音仪、单个传感器来进行胎心监测,它们存在误差大或属于"入侵式"的监测或精度低的问题。 [0004] The object of the present invention is to provide a fetal heart monitor athletic array based on the piezoelectric film sensor, in order to solve the conventional multi-fetal heart monitor fetal heart sounds using the stethoscope, Doppler fetal tone instrument, a single sensor monitoring fetal heart rate, there are problems with large errors are low or "invasive" or monitoring accuracy.

[0005] 所述的目的是通过以下方案实现的:所述的一种基于压电薄膜传感器的阵列式胎心监测腹带,是由腹带、多个压电薄膜传感器、检测电路组成; [0005] The object is achieved by the following protocol: the array based on a fetal heart monitor athletic piezoelectric film sensor is a cummerbund, a plurality of piezoelectric film sensor, the detection circuit;

[0006] 腹带的两端部上分别设置有魔术贴,多个压电薄膜传感器按阵列排列设置在腹带的中部;检测电路设置在腹带上;所述检测电路由前置差分放大电路、滤波电路、模/数转换电路、DSP模块、存储器模块、接口模块组成;压电薄膜传感器阵列的信号输出总线连接前置差分放大电路的信号输入总线,前置差分放大电路的信号输出总线连接滤波电路的信号输入总线,滤波电路的信号输出总线连接模/数转换电路的信号输入总线,模/数转换电路的数据输出总线连接DSP模块的数据输入总线,DSP模块的数据存储输出输入总线端连接存储器模块的数据存储输出输入总线端,DSP模块的数据输出总线端与接口模块的数据输出总线端连接;所述DSP模块对胎儿能量算法为:第一步,利用Teager能量算子突出信号的高能量区域,Teager能量算子的计算采用如下公式: [0006] On both end portions are respectively provided with a Velcro athletic, a plurality of piezoelectric film sensors arranged in an array is provided in the middle of the bellyband; a detection circuit disposed on a bellyband; pre-amplified by the differential circuit detecting circuit , filter circuit, analog / digital conversion circuit, DSP blocks, the memory module, the interface module; piezoelectric film sensor array connected to a signal output bus signal input bus preamble differential amplifier circuit, the differential pre-amplified signal output bus connecting circuit signal input bus signal output bus connection-mode signal input bus, the filter circuit of the filter circuit of the a / D conversion circuit, a data storage input and output bus terminal of a data input bus, the DSP block data output bus connected to the DSP module analog / digital conversion circuit stores the output data bus input terminal connected to the memory module, the data output terminal of the DSP module bus interface module connected to the data output bus terminal; the DSP module fetal energy algorithm: first, the use of projection operators Teager energy signal high energy zone, Teager energy operator is calculated using the following formula:

[0007] y(n) =χ2(η_1 )_χ(η_1 )*x(n_2) [0007] y (n) = χ2 (η_1) _χ (η_1) * x (n_2)

[0008] 其中:x(n)为接收到的胎儿心跳信号,y(n)为Teager能量信号;第二步,Teager能量信号经过自相关处理实现胎儿心率的初步估计;第三步,自相关处理后得到的信号经过峰值估计处理后,得到峰值点所对应的频率和能量;第四步,峰值估计得到的能量信号经过能量比较处理,得到最大能量所对应的频率,将此频率作为胎儿的心率;所述DSP模块3-4对胎儿心脏位置的算法为:在同一平面,假设胎儿心脏位置与所述压电薄膜传感器的坐标位置分别为(x,y)和(Xl,yi),其中i=〇,l,2……10,^为声源到第j个所述压电薄膜传感器之间的距离差,用方程可表示为: r〇= (·γ ~ χ〇+ (-^ ~ y〇)" [0008] where: x (n) is the fetal heartbeat received signal, y (n) is Teager energy signal; a second step, after the Teager energy signal processing implementation autocorrelation preliminary estimate the fetal heart rate; the third step, the autocorrelation processing the signal obtained through the estimated peak was treated to give the energy and the frequency corresponding to the peak point; a fourth step, the estimated energy signal peaks of energy through the comparison processing to obtain the maximum energy corresponding to the frequency, as the frequency of this fetus heart rate; the DSP module 3-4 fetal heart location algorithm is: in the same plane, assuming a position of the fetal heart piezoelectric film sensor are coordinate position (x, y) and (Xl, yi), where i = square, l, 2 ...... 10, ^ is the distance between the sound source to the j-th differential of the piezoelectric film sensor, with the equation can be expressed as: r〇 = (· γ ~ χ〇 + (- ^ ~ y〇) "

[0009] Γ2=(.χ-λ-;)2 + (ν-ν0)2 Δγ = r. - r0 = ct. [0009] Γ2 = (. Χ-λ -;) 2 + (ν-ν0) 2 Δγ = r - r0 = ct..

[0010] 式中,c为声传播速度,^为声源信号到第j个所述压电薄膜传感器与到所述压电薄膜传感器(xq,y〇)的时延值,由双曲线的定义可知,每对时延值确定一条双曲线,贝>J两对时延值确定两条双曲线,且这两条双曲线的交点位置即为心脏位置。 [0010] In the formula, c is the sound propagation velocity, acoustic ^ j-th source signal to the piezoelectric film sensor and to the delay values ​​piezoelectric film sensor (XQ, y〇) by the hyperbola definition, determining a latency value for each hyperbola, Tony> J two pairs of two hyperbolic delay value determination, and this position is the intersection of two hyperbolas heart position.

[0011] 本发明所采用的压电薄膜传感器具有响应速度快、灵敏度高和线性度好的优点, 能够保证检测的准确性;由于压电薄膜传感器质量小,柔软,耐用,其嵌入腹带后能够很好的与人体贴合,人机功效良好。 [0011] The piezoelectric film sensor used in the present invention has a fast response, high sensitivity and good linearity advantages, to ensure the accuracy of detection; piezoelectric film sensor due to the small mass of soft, durable, which is embedded after cummerbund It can be very good and thoughtful people together, good ergonomics.

[0012] 本发明只需在妊娠妇女腹部缠绕一条所述腹带,便能够对妊娠妇女胎心率进行实时监测,同时对妊娠妇女体内胎儿心脏位置做出估计,能满足孕妇在家中自我监测的需要, 并且存储的监测数据也能为医生提供参考,保证了妊娠妇女以及胎儿的健康。 [0012] The present invention simply wrapping the abdomen of pregnant women a cummerbund, will be able to perform real-time monitoring of pregnant women fetal heart rate, and make estimates of pregnant women fetal heart location in the body, to meet the self-monitoring at home for pregnant women needs, and monitoring data storage can also provide a reference for doctors to ensure that pregnant women and fetal health.

附图说明 BRIEF DESCRIPTION

[0013] 图1是本发明的整体结构示意图; [0013] FIG. 1 is a schematic diagram of the overall configuration of the present invention;

[0014] 图2是图1中检测电路3的结构示意图。 [0014] FIG. 2 is a block diagram of a detection circuit 3 of FIG.

具体实施方式 detailed description

具体实施方式[0015] 一:如图1、图2所示,它是由腹带1、多个压电薄膜传感器2、检测电路3组成; DETAILED DESCRIPTION [0015] a: 1, 2, which is a cummerbund 1, a plurality of piezoelectric film sensor 2, a detection circuit 3 composed;

[0016] 腹带1的两端部上分别设置有魔术贴1-1,多个压电薄膜传感器2按阵列排列设置在腹带1的中部;检测电路3设置在腹带1上;所述检测电路3由前置差分放大电路3-1、滤波电路3-2、模/数转换电路3-3、DSP模块3-4、存储器模块3-5、接口模块3-6组成;压电薄膜传感器2阵列的信号输出总线连接前置差分放大电路3-1的信号输入总线,前置差分放大电路3-1的信号输出总线连接滤波电路3-2的信号输入总线,滤波电路3-2的信号输出总线连接模/数转换电路3-3的信号输入总线,模/数转换电路3-3的数据输出总线连接DSP模块3-4的数据输入总线,DSP模块3-4的数据存储输出输入总线端连接存储器模块3-5的数据存储输出输入总线端,DSP模块3-4的数据输出总线端与接口模块3-6的数据输出总线端连接;所述DSP模块3-4对胎儿能量算法为:第一步,利用Teager能量算子突出信号的高能量区域, Tea 1-1 are provided with Velcro, a plurality of piezoelectric film sensors arranged in an array 2 is provided in the middle of both end portions of the bellyband 1 [0016] 1 cummerbund; 3 disposed on the detection circuit 1 bellyband; the preamble detection circuit 3 by the differential circuit 3-1, the filter circuit 3-2 amplifies, analog / digital conversion circuits 3-3, DSP modules 3-4, 3-5 a memory module, the interface module composed of 3-6; piezoelectric film 2 the sensor array output signal bus connecting the front differential amplifier circuit input bus 3-1 signal, a differential pre-amplifier 3-1 outputs a signal bus connecting the bus signal input filter circuit, the filter circuit 3-2 3-2 a signal output bus connected to the analog / digital conversion circuit input bus 3-3 signals, analog / digital conversion circuit 3-3 outputs a data input bus connected to the DSP module data bus 3-4, the DSP module outputs the input data storage 3-4 a data bus terminal is connected the memory module stores the output terminal 3-5 of the input bus, DSP blocks, data output bus terminal 3-4 and the data output bus interface module is connected to terminal 3-6; 3-4 to the DSP module fetal energy algorithm is: first, the use of high energy operator Teager energy projection region of the sub signals, Tea ger能量算子的计算采用如下公式: ger energy operator is calculated using the following formula:

[0017] y(n) =χ2(η_1 )_χ(η_1 )*x(n_2) [0017] y (n) = χ2 (η_1) _χ (η_1) * x (n_2)

[0018]其中:x(n)为接收到的胎儿心跳信号,y(n)为Teager能量信号;第二步,Teager能量信号经过自相关处理实现胎儿心率的初步估计;第三步,自相关处理后得到的信号经过峰值估计处理后,得到峰值点所对应的频率和能量;第四步,峰值估计得到的能量信号经过能量比较处理,得到最大能量所对应的频率,将此频率作为胎儿的心率;所述DSP模块3-4对胎儿心脏位置的算法为:在同一平面,假设胎儿心脏位置与所述压电薄膜传感器的坐标位置分别为(x,y)和(Xl,yi),其中i=〇,l,2……10,^为声源到第j个所述压电薄膜传感器之间的距离差,用方程可表示为: rn2 =(.T-.Yu)2+(j-jn)2 [0018] where: x (n) is the fetal heartbeat received signal, y (n) is Teager energy signal; a second step, after the Teager energy signal processing implementation autocorrelation preliminary estimate the fetal heart rate; the third step, the autocorrelation processing the signal obtained through the estimated peak was treated to give the energy and the frequency corresponding to the peak point; a fourth step, the estimated energy signal peaks of energy through the comparison processing to obtain the maximum energy corresponding to the frequency, as the frequency of this fetus heart rate; the DSP module 3-4 fetal heart location algorithm is: in the same plane, assuming a position of the fetal heart piezoelectric film sensor are coordinate position (x, y) and (Xl, yi), where i = square, l, 2 ...... 10, ^ is the distance between the sound source to the j-th differential of the piezoelectric film sensor, with the equation can be expressed as: rn2 = (. T-.Yu) 2+ (j -jn) 2

[0019] r;=(.x-.t;)2 + (vJ〇)2 Αη = η - Γ〇= CTf [0019] r; = (. X-.t;) 2 + (vJ〇) 2 Αη = η - Γ〇 = CTf

[0020] 式中,c为声传播速度,^为声源信号到第j个所述压电薄膜传感器与到所述压电薄膜传感器(xq,y〇)的时延值,由双曲线的定义可知,每对时延值确定一条双曲线,贝两对时延值确定两条双曲线,且这两条双曲线的交点位置即为心脏位置。 [0020] In the formula, c is the sound propagation velocity, acoustic ^ j-th source signal to the piezoelectric film sensor and to the delay values ​​piezoelectric film sensor (XQ, y〇) by the hyperbola definition, determining a latency value for each hyperbola, shellfish two pairs of two hyperbolic delay value determination, and this position is the intersection of two hyperbolas heart position.

[0021] 所述压电薄膜传感器2阵列由多片MEAS公司LDT0-028K构成,前置差分放大电路3-1由多片INA326芯片构成;滤波电路3-2由多片运算放大器芯片LF356构成;模/数转换电路3-3由多片AD7091R构成;DSP模块3-4型号可选用TMS320C674X低功耗浮点DSP;存储器模块3-5型号可选用Micron公司256MB DDR3MT41J256M8芯片;接口模块3-6型号可选用ADI公司AD8376VGA 芯片。 [0021] The piezoelectric film sensor array constituted by a plurality of sheet 2 MEAS company LDT0-028K, front differential amplifier circuit constituted by a plurality of sheets 3-1 INA326 chip; a filter circuit 3-2 is constituted by a multi-chip substrate the LF356 operational amplifier; analog / digital conversion circuit 3-3 is constituted by a multi-sheet AD7091R; DSP module models can be selected TMS320C674X 3-4 floating-point low power the DSP; type 3-5 optional memory module 256MB DDR3MT41J256M8 chip Micron Corporation; model interface module 3-6 can be selected ADI's AD8376VGA chip.

[0022] 所述压电薄膜传感器2阵列的中心点与所述腹带1的中心点、妊娠妇女的肚脐对准,具体位置是在所述腹带1的中心点放置一个压电薄膜传感器,在水平方向上对称于所述腹带1的中心点左、右两侧分别放置四个压电薄膜传感器,在肚脐水平的方向上,相邻所述压电薄膜传感器之间的距离为6厘米,在垂直方向上,对称于所述腹带1的中心点上、下两端分别对称放置一个压电薄膜传感器,垂直方向上的压电薄膜传感器与腹带1的中心点之间的距离为6厘米。 [0022] The piezoelectric film sensor array 2 and the center point of the center point of a cummerbund, the navel aligned pregnant women, a specific location is placed at the center point of the piezoelectric film sensor bellyband 1, in a horizontal direction symmetrically to the center point left a cummerbund right sides of the piezoelectric film sensor are placed four in the horizontal direction of the navel, a distance between adjacent ones of said piezoelectric film sensor 6 cm , in the vertical direction, symmetrically to the center point on the abdominal belt 1, are symmetrically disposed at both ends of a piezoelectric film sensor, the distance between the center point of the piezoelectric film sensor in the vertical direction and the cummerbund is 1 6 cm.

[0023]工作原理:压电薄膜传感器2阵列对胎儿心脏跳动信号进行监测,压电薄膜传感器2阵列将上述监测到的信号通过前置差分放大电路3-1、滤波电路3-2、模/数转换电路3-3送入DSP模块3-4中,DSP模块3-4将所述胎心信号4分为两路,一路经过非线性滤波器处理得到相应的胎心率监测结果,另一路经过时延估计处理得到胎儿心脏位置,并将胎心率和胎儿心脏位置实时记录在存储器模块3-5中,同时把相应结果送至接口模块6。 [0023] The working principle: an array of piezoelectric film sensor 2 to monitor the fetal heart beat signal, the piezoelectric film sensor array 2 to the said monitoring signal amplifying circuit 3-1, filter circuits 3-2, via the front differential analog / digital conversion circuit 3-3 into the DSP modules 3-4, 3-4 to the DSP module FHR signal 4 is divided into two, all the way through to give the corresponding nonlinear filter processing FHR monitoring result, another way after time delay estimation process to obtain the location of the fetal heart, fetal heart rate and the real-time recording and fetal heart position 3-5 in the memory module, while the corresponding result to the interface module 6.

Claims (2)

1. 一种基于压电薄膜传感器的阵列式胎屯、监测腹带,它是由腹带(1)、多个压电薄膜传感器(2)、检测电路(3)组成; 其特征在于腹带(1)的两端部上分别设置有魔术贴(1-1),多个压电薄膜传感器(2)按阵列排列设置在腹带(1)的中部;检测电路(3)设置在腹带(1)上;所述检测电路(3)由前置差分放大电路(3-1)、滤波电路(3-2)、模/数转换电路(3-3)、DSP模块(3-4)、存储器模块(3- 5)、接口模块(3-6)组成;压电薄膜传感器(2)阵列的信号输出总线连接前置差分放大电路(3-1)的信号输入总线,前置差分放大电路(3-1)的信号输出总线连接滤波电路(3-2)的信号输入总线,滤波电路(3-2)的信号输出总线连接模/数转换电路(3-3)的信号输入总线, 模/数转换电路(3-3)的数据输出总线连接DSP模块(3-4)的数据输入总线,DSP模块(3-4)的数据存储输出输入总线端连接存储器模块(3-5)的数据存储输出 A bead array based Tun piezoelectric film sensor, monitoring athletic, it is by athletic supporter (1), a plurality of piezoelectric film sensor (2), a detection circuit (3) composition; wherein cummerbund are provided with a Velcro (1-1) (1) both end portions, a plurality of piezoelectric film sensor (2) arranged in an array arranged in the middle abdomen strap (1); detecting circuit (3) provided cummerbund (1); the detection circuit (3) by the front differential amplifying circuit (3-1), a filter circuit (3-2), an analog / digital conversion circuit (3-3), DSP modules (3-4) , memory modules (3-5), the interface module (3-6) composition; piezoelectric film sensor (2) connected to the array output bus signal pre differential amplifier circuit (3-1) the bus signal input, pre differential amplifier circuits (3-1) connected to a signal output bus filtering circuit (3-2) bus input signal, a filter circuit (3-2) connected to a signal output bus analog / digital conversion circuit (3-3) bus signal input, analog / digital conversion circuit (3-3) connected to a data output bus DSP module (3-4) of a data input bus, DSP blocks, (3-4) storing the output data bus input terminal connected to the memory module (3-5) output data storage 入总线端,DSP模块(3-4)的数据输出总线端与接口模块(3-6)的数据输出总线端连接;所述DSP模块(3-4)对胎儿能量算法为:第一步,利用Teager能量算子突出信号的高能量区域,Teager能量算子的计算采用如下公式: y(n) =x2(nl)-x(nl)*x(n-2) 其中:x(n)为接收到的胎儿屯、跳信号,y(n)为Teager能量信号;第二步,Teager能量信号经过自相关处理实现胎儿屯、率的初步估计;第=步,自相关处理后得到的信号经过峰值估计处理后,得到峰值点所对应的频率和能量;第四步,峰值估计得到的能量信号经过能量比较处理,得到最大能量所对应的频率,将此频率作为胎儿的屯、率;所述DSP模块(3-4)对胎儿屯、脏位置的算法为:在同一平面,假设胎儿屯、脏位置与所述压电薄膜传感器的坐标位置分别为(x,y)和(xi,yi),其中i = 0,l,2……10,r^为声源到第j个所述压电薄膜传感器之间的距 End of the bus, the DSP module (3-4) and a data output bus terminal interface module (3-6) connected to a data output bus terminal; the DSP module (3-4) on the fetus energy algorithm: a first step, Teager energy operator using the high energy projection region of the sub signals, Teager energy operator is calculated using the following formula promoter: y (n) = x2 (nl) -x (nl) * x (n-2) where: x (n) is Tun received fetal jump signal, y (n) is Teager energy signal; a second step, after the autocorrelation Teager energy signal processing implementation fetal Tun, preliminary estimates rate; = first step, since the correlation processing through the signal obtained estimated peak was treated to give the energy and the frequency corresponding to the peak point; a fourth step, the estimated energy signal peaks of energy through the comparison process, to obtain a frequency corresponding to the maximum energy, the frequency of this village as a fetus, rate; the DSP modules (3-4) on the fetus Tun, dirty location algorithm is: in the same plane, it is assumed fetal Tun, dirty position and the coordinate position of the piezoelectric film sensor are (x, y) and (xi, yi) , where i = 0, l, 2 ...... 10, r ^ to the sound source between the j-th from the piezoelectric film sensor 差,用方程可表示为: Difference, with the equation can be expressed as:
Figure CN103222863BC00021
式中,C为声传播速度,为声源信号到第j个所述压电薄膜传感器与到所述压电薄膜传感器(xo,yo)的时延值,由双曲线的定义可知,每对时延值确定一条双曲线,则两对时延值确定两条双曲线,且运两条双曲线的交点位置即为屯、脏位置。 Wherein, C is the acoustic propagation speed of the sound source signal to the j-th and the piezoelectric film sensor to the piezoelectric film sensor (xo, yo) of the delay value, known hyperbola defined by each pair determining a latency value hyperbola, the two pairs of two hyperbolic delay value determination, and the run is the point of intersection of two hyperbolas Tun, dirty position.
2. 根据权利要求1所述的一种基于压电薄膜传感器的阵列式胎屯、监测腹带,其特征在于所述压电薄膜传感器(2)阵列的中屯、点与所述腹带(1)的中屯、点、妊娠妇女的肚厮对准, 具体位置是在所述腹带(1)的中屯、点放置一个压电薄膜传感器,在水平方向上对称于所述腹带(1)的中屯、点左、右两侧分别放置四个压电薄膜传感器,在肚厮水平的方向上,相邻所述压电薄膜传感器之间的距离为6厘米,在垂直方向上,对称于所述腹带(1)的中屯、点上、下两端分别对称放置一个压电薄膜传感器,垂直方向上的压电薄膜传感器与腹带(1)的中屯、 点之间的距离为6厘米。 The one of the tire 1 based array Tun piezoelectric film sensor, monitoring athletic, wherein the piezoelectric film sensor (2) as claimed in claim Tun array, the athletic point ( 1) in the village, points aligned servant belly pregnant women, the specific location is the bellyband (1) in the village, a piezoelectric film sensor point is placed, in a horizontal direction symmetrically on the athletic supporter ( 1) in the village, point left and right sides, respectively, four piezoelectric film sensor is placed on the belly servant horizontal direction, the distance between adjacent ones of said piezoelectric film sensor is 6 cm in the vertical direction, the athletic symmetrical (1) village, point lower ends are symmetrically disposed between a piezoelectric film sensor, the piezoelectric film sensor and the cummerbund (1) in the vertical direction Tun, point distance of 6 cm.
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