Real-time ECG Monitoring System Research And Design Based On SCM

Heart disease is one of the important diseases that threaten human health, and itsmost important is the diagnosis of electrocardiogram. Who has been suffering from heartdisease, a real-time ECG monitoring system is essential for monitoring heart activity, youcan time to capture a variety of anomalies of the heart rhythm, and these changes whethercan be accurately extracted directly impact on health care personnel on disease diagnosisand subsequent treatment. Medical practice has shown that, heart disease prevention andhealth care is a particularly important aspect of family health. Therefore, family-orientedreal-time monitoring system of ECG for heart disease prevention in the early and lateobservation has very important significance.In the paper the previous section introduces the basic features of the ECG, and ECGdetection specificity and conditionality. According to the particularities of the ECG, thisarticle has completed including hardware and software designs. Hardware parts of themain design include analog circuits and digital circuit parts. Analog part collection,including ECG amplification, filtering, display and so on. Choose us in this article aprogrammable, high-performance in-amp AD8221as a preamplifier, and according to theECG signal of weakness and interference, designing a multistage amplifier, the resultingideal of ECG signal amplitude. At the same time through a band pass filter ECG signalfrequency set to100Hz effective access to information, double t-notch circuit through the50Hz source eliminating interference from mains, delivering the right signal forsubsequent digital processing part.In part of the digital circuit of TI’s low power16-bit mixed-signal processingMSP430F449as core processing devices, yes the entire system controlled by single chipminiaturization, intelligent. This partly through peripheral circuit of single chip design ofthe LCD display, SD card storage circuits, the circuit indicating circuit, power conversioncircuits such as press operations, making it more user-friendly, simple operation and use. Selection has control chip is ST7920of RT12864LCD displayed chip for displayed;design has2*3of ranks type keyboard,6a press respectively implementation began, andclose, and function, and select, and confirmed, and canceled of indicates; used has TIcompany of TPS7333chip and TPS60130chip as power conversion chip, both are is lowpower of chip, in must degree Shang reduced has system of power; to makes patients ofheart electric information can was doctor for deep of research and diagnosis, This dialogbetween the computer and the design, main drive on the serial RS232Protocol, using theSP3220as an RS232driver, enables high-speed, complete transmission of ECG.Software part of the main single-chip computer control part of the main program andthe ECG signal processing, using parts of a modular implementation of software design.Disruption by single-chip computer to realize on ECG analog to digital conversion,display, and storage, ECG sampling frequency is set to200Hz, sampling every5msdisplay. ECG baseline drift and50Hz power-line interference, influence on the ECGdiagnosis of, this article uses a simple band-stop filter with integer coefficients, usingall-pass network with the same phase constitutes deferred toiletry online subtraction, togood effect, and also to take a four-point filtering further elimination of burrs, etc. In partof the QRS complex, detection, differential threshold algorithm based on adaptive,continually updated through Adaptive learning threshold, enabling the detection of ECG,this algorithm is simple, and has a very fast operation speed, well ported to run on asingle-chip. At the same time calculates the instantaneous heart rate and average heart rate,judge the normal activity of the heart. Different classification of arrhythmia analysis andautomatic analysis of arrhythmia, using Adaptive template method of decision treeanalysis, comprehensive analysis of arrhythmia standards, and to make the conditions, bytesting the MIH/BIH ECG database, are an ideal test of accuracy.