The Study Of Real-time Processing Method For Ballistocariogram Signal Based On The CPLD

Heart attack is one of the leading causes of death. Ballistocardiogram is a graphical representation of the recoil from the pumping action of the heart, by which cardio motility is monitored. BCG reduces the possibility of stress that may occur during other forms of cardio motility monitoring by removing direct physical contact with sensors, which may cause nervousness, so that the test takers can be monitored in a relaxing manner. By recording and monitoring BCG signals, cardio motility can be closely observed and abnormal changes can be early detected, which help reduce modality.In this article, a newly designed arrangement that allow the patient sitting on a chair is introduced to acquire signals. The patient sits on the chair, and BCG collects signals by the sensors, indicating the patient’s and the chair’s weight and the recoil from the pumping action of the heart.In order to eliminate signal interference, signal filter may be needed because BCG signal is biological signal sending from human body with low frequency and low intensity and is vulnerable to disturbance. According to the real-time processing system of BCG signal based on CPLD. FIR filter pretreatment is designed based on CPLD to pretreat BCG signal in real-time. De-noise the BCG signal in real time by using innovatively orthogonal wavelet transform. The feasibility of this filtering method can be proved through power spectra density comparison, Quartus Ⅱ simulation and Matlab simulation comparison, and oscilloscope monitoring.In the end, a quantitative analysis of the peaks and troughs of J is detected in this article. On the base of this, by comparing the JJ interval and RR interval which is drawn at the same time, it could prove the rationality of JJ interval of BCG signal and the feasibility of BCG signal on heart function monitoring in daily life, and lay the foundation of BCG signal on heart function monitoring in daily life.