| 超声多普勒信号准平稳分段的研究 |
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| 引用本文： | 张乃强,王威琪,汪源源,余建国,吴晓峰,刘斌.超声多普勒信号准平稳分段的研究[J].中国生物医学工程学报,2000,19(3):342-347. |
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| 作者姓名： | 张乃强 王威琪 汪源源 余建国 吴晓峰 刘斌 |
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| 作者单位： | 复旦大学电子工程系,复旦大学生物医学工程研究所,上海,200433 |
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| 基金项目： | 国家自然科学基金，教育部博士点基金 |
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| 摘 要： | 超声多普勒音频信号是一种非平稳时间序列 ,其功率谱是时变谱。为了能够准确有效地计算它的功率谱 ,要兼顾时间分辨力和时间窗截断效应。以前采用 10ms固定长度时间窗进行功率谱估计虽有其合理性但并不完善。本文利用线性调频信号研究超声多普勒信号的非平稳特性 ,并在此基础上得出了超声多普勒信号准平稳时间段随心动时相不同而不同的结论 ,为超声多普勒信号谱分析的时间窗选取提供依据。
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| 关 键 词： | 超声多普勒 非平稳 功率谱 准平稳分段 |
RESEARCH OF STATIONARY SEGMENTATION OF DOPPLER ULTRASOUND SIGNALS |
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| Zhang Naiqiang,Wang Weiqi,Wang Yuanyuan,Yu Jianguo,Wu Xiaofeng,Liu Bin.RESEARCH OF STATIONARY SEGMENTATION OF DOPPLER ULTRASOUND SIGNALS[J].Chinese Journal of Biomedical Engineering,2000,19(3):342-347. |
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| Authors: | Zhang Naiqiang Wang Weiqi Wang Yuanyuan Yu Jianguo Wu Xiaofeng Liu Bin |
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| Abstract: | The Doppler ultrasound signal is a non-stationary time sequence. Its power spectrum density is time-varying. It is nessecery to keep balance between the time resolution and the truncation effect of the time window. The former method, assuming 10 ms as the best time window length, had its rationality but not consummated. Here the linear frequency modulation signal was used to simulate the nonstationary features of Doppler ultrasound signal. It was shown that the time length of stationary segmentation of Doppler ultrasound signal was related to different phases of cardiac cycle, which could be used for window choice in Doppler signal spectral analysis. |
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| Keywords: | Doppler ultrasound Non-stationary Power spectrum Stationary segmentation |
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