| The design of system in this paper is based on the characteristics of the dynamic electrocadiogram(DECG) and electrocardiogram(ECG)-ward instrument. The author introduced the basic principle of the electrocardiogram at the beginning, then study and develop the Mono-Channel Dynamic Holter system in both hardware and software aspects.In hardware aspect, at first, the author analysis all kinds of the interfere signals and its characteristics in the DECG measurement, and studies all of the interfere signals carefully and also explains how to avoid them. Then, the author analysis the characteristics of ECG signal carefully, and considers the pick-up of the situation information of R-wave. The author has realized the very basic function with compact circuit. The ECG signals can be conversed to another form, so they can be record by many kinds of digital-audio-record formats.The MCU software is programmed on the base of C-language with the support of Keil C51 compiler to realize the display of ECG and heartbeat frequency. The structure of the program is clear, and the program is easy to maintenance. The software of DECG's replay is based on the Borland C++6.0. It has good interface for us. We can use the program easily with the operating system Windows 98, Windows 2000/NT or Windows XP. We can also play the ".wav" files in different sampling frequency and precision. We can adjust the velocity of review and the range of the ECG wave.The whole system consists with ECG-detect circuit, recorder and its accidental circuit, ECG-ward part, DECG-review program. These parts can be composed to Holter or ECG-ward system neatly. All of the recorded data can be exchanged with computers with the high-speed USB port.The recorder can record ECG-signal continuously for more than 24 hours. The system has a high cost-performance value. It's function can be extended and upgraded easily. |
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