心音檢測系統(tǒng)中綜合評估方法的設(shè)計及實現(xiàn)
[Abstract]:Heart sound signal is an important physiological signal of human body, which contains a large number of physiological and pathological information about the state of each part of the heart, so it is of great significance to collect and study the heart sound signal. The heart sound detection system in this paper automatically analyzes the heart rate and heart sound comprehensive index by collecting the heart sound signal, and provides a new platform for the user to detect the heart sound by using the voice broadcast analysis results. In this paper, starting with the frequency domain energy spectrum of heart sound, the frequency domain energy spectrum distribution of heart sound is analyzed, and the calculation method of heart sound energy distribution index is given, and then the heart sound synthesis index (CITF), is put forward according to the heart rate and heart rate uniformity of heart sound. CITF is a quantitative index of the comprehensive characteristics of heart sound in time domain and frequency domain. At the same time, the calculation method of CITF is designed, which provides a new method for the comprehensive evaluation of heart sound. In order to overcome the abnormal situation that the noise becomes pseudo peak value or the first heart sound peak value is not obvious after the heart sound is actually collected, this paper designs the adaptive threshold and the preset peak span by improving the selection sorting algorithm. A method for calculating heart rate with low error rate, constant threshold method (CDT).), is obtained. In this paper, a heart sound detection system is designed and implemented. The heart sound detection system includes acquisition module, voice broadcast module and main control module, and the CITF method and heart rate CDT method are applied to the system. The functions of heart sound acquisition and preprocessing, heart sound comprehensive index calculation, heart rate calculation, voice broadcast and so on are completed. At the same time, the system is miniaturized and packaged, which is easy to carry and use. Finally, the accuracy and stability of the heart sound detection system are tested by sample tracking experiment and repeated experiment in many cases. Through the analysis of the experimental results, the system upgrade scheme is put forward. On the basis of the original scheme, (1) an improved heart rate calculation method is obtained by designing the dynamic threshold; (2) the symbolic entropy of heart sound is calculated, and the symbolic entropy is applied to the comprehensive index of heart sound. The comparative experiments show that the improved scheme has obvious effect on improving the accuracy and stability of heart sound analysis. The comprehensive evaluation method of heart sound and the scheme of heart sound detection system proposed in this paper have portability, and they can be applied to hardware platforms with different performance, and have certain popularization and practical value.
【學(xué)位授予單位】:南京郵電大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:R540.4;TN912.3
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