共查询到19条相似文献,搜索用时 125 毫秒
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利用脉搏图像传感器和MP425数据采集卡设计了一种多信息同步采集系统,实现了脉搏动态图像和心电信号的同步采集,并运用Matlab软件的数据可视化功能,实现了两种信号的同步动态再现;研究结果表明,该同步采集系统具有稳定的可靠性和精确性,为揭示脉搏信号和心电信号之间的动态联系与规律提供了一种新的研究思路,同时也为提取反映人体亚健康状态脉搏心电变化的特征参量奠定了良好基础. 相似文献
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将Marr小波变换和非线性能量算子相结合实现了心电信号的R波检测,心电信号的Marr小波分解信号很好地抑制了各种噪声干扰,结合非线性能量算子运算可突出了QRS波的特征点,使得阈值检测便于实施,利用修正策略提高了R波检测率,经MIT/BIH标准心律失常数据库验证,R波的检测率可达到99.7%,该方法对于心电信号的自动分析系统具有应用价值。 相似文献
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人体生命体征信息是指人体生理和病理信息,是判断病人的病情轻重缓急以及病情诊断的依据。脉搏信号是人体众多信号中较具代表性的一种,携带有丰富的人体健康状况信息。文章从目前使用较为广泛的两种脉搏信号采集方法出发,着重分析了压力脉搏波信号分析方法的临床适用性及应用现状,提出了应对脉搏波进行更为深入的研究,从而为人体脉搏波信号采集与分析系统的设计提供科学的依据。 相似文献
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本文首先采用RLS自适应算法对心电信号进行实时建模。经过约20个心电周期,本算法使可以基本完成自身的调整。利用多尺度理论,将小波分析和Kalman滤波结合起来,在对信号预测的同时定位心电信号的R峰。对于心电信号中因伪迹造成的误判,可通过在小波检测方法中设置相应的检测策略克服。实验表明,该算法提高了抗噪声性能。 相似文献
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A combined, cross-correlation procedure for computerized arrhythmia detection is presented. It enables the classification of a wide range of arrhythmia and is based upon the determination of both P and QRS waves. The electrocardiogram (ECG) signal is recorded from external leads, digitized (10 bits of resolution) at 1.28 kHz and processed with a CDC 6600 computer. A normal beat is stored as a reference signal and the onsets of the P wave and the QRS complex are measured for determining the PR, PP, and RR intervals. The combined cross-correlation procedure is carried out between the template and each successive ECG waveform over two time intervals, the first of which includes the P wave and the second, the QRS complex. Prior to this correlation procedure each of the ECG waveforms is filtered through a nonrecursive digital bandpass filter (10 and 100 Hz for low and high cutoff frequencies, respectively). The cross-correlation functions are then calculated by means of a cross spectrum and Fast Fourier Transform algorithm. The maximum value of the normalized cross-correlation function and the time shift providing that value are searched for, allowing (1) determination of the similarity between the present beat and the normal reference beat, allowing for the discrimination of abnormal P and QRS shapes; (2) accurate measurement of the RR, PP, and PR intervals of this subsequent waveform. Applying this method enables a reliable detection of a wide variety of arrhythmia. 相似文献
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基于小波变换的虚拟心电信号分析仪 总被引:1,自引:0,他引:1
针对心电信号自动分析和处理的需要,采用小波变换的方法对心电信号进行消噪、特征提取、压缩等分析与处理,并且结合虚拟仪器LabVIEW设计实现了多功能虚拟心电信号分析仪。实验结果表明,它对于心电信号的自动检测、优化分析和处理有重要意义。 相似文献
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基于HMM的心电数据压缩方法研究 总被引:1,自引:0,他引:1
心电数据压缩在远程医疗和动态监测方面具有非常重要的意义。心电信号的各个脉动周期具有很强的相关性。基于隐马尔可夫模型(HiddenMarkovModel,HMM)的心电数据压缩方法充分利用ECG信号的相关性对源信息进行处理。实验证明,该方法在高数据压缩比的情况下仍然能够很好地恢复原始数据,计算复杂度相对较小。 相似文献
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Electrocardiogram (ECG) signal denoising has always been a hot research issue. In order to eliminate the noises in ECG signal, a denoising method based on adaptive complete set empirical mode decomposition (CEEMDAN) and wavelet improved threshold function is proposed. Firstly, this method firstly decomposes the ECG signal by CEEMDAN to obtain a set of intrinsic modal functions (IMFs) from high frequency to low frequency. CEEMDAN decomposition is performed on ECG signal to yield several modal components (IMF). Secondly, the correlation coefficient method is used to perform wavelet denoising with improved threshold on the high frequency IMFs. For the low frequency IMFs, by setting a fixed threshold, the IMFs below the threshold is considered to be the baseline drift signal and removed. Finally, the denoised IMFs and the retained IMFs are reconstructed. The experimental results show that the proposed method is more effective than the empirical mode decomposition (EMD) wavelet denoising, and the global average empirical mode decomposition (EEMD) wavelet denoising method. 相似文献
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谢永红 《计算机工程与应用》2012,48(14):235-240
多维独立分析(Multidimensional Independent Component Analysis,MICA)方法适用于实现多分量信号分析和分量提取,可实际应用于对胎儿心电信号的提取。为了说明MICA算法分离结果的可靠性,利用动态心电合成模型生成仿真的心电信号数据进行了验证,用vkMICA、cfMICA、SJADE、MSOBI四种MICA算法对实际采集到孕妇心电数据集进行了处理。实验结果显示,四种MICA算法可提取出较纯净的胎儿心电信号,并能较好地反映出胎儿心电信号的实际特征。 相似文献
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This paper presents a digital signal processor (DSP)-based new multichannel electrocardiogram (ECG) system for 12-lead synchronization ECG automatic analysis in real-time with high sampling rate at 1000 Hz and 12-bits precision. Using the hardware structure of double-CPU based on Microprocessor (MPU) 89C55 and DSP TMS320F206 combines the powerful control ability of MPU with DSPs fast computation ability. Fully utilizing the double-CPUs resource, the system can distribute the reasonable CPU-time for the real-time tasks of multichannel synchronization ECG sampling, digital filter, data storing, waveform automatic analysis and print at high sampling rate. The digital ECG system has the advantages of simple structure, sampling with high speed and precision, powerful real-time processing ability and good quality. The paper discusses the system's principle and the skilful hardware design, also gives the ECG processing using the fast simple integer-coefficient filter method and the automatic calculation algorithms of the ECG parameters such as heart rate, P-R interval, Q-T interval and deflexion angle of ECG-axis etc. The system had been successfully tested and used in the ECG automatic analysis instrument. 相似文献