| Heart disease is one of the uppermost disease that threatens human's life,it is characterized by its abruptness and high death rate, and people have attatched more and more importance to the prevention of heart disease. Electrocardiosignal is an important basis of heart disease diagnosis. Traditional recorder(Holter) can continuously records electrocardiosignal for 24 or 48 hours, but data analysis has to be done in hospital. The development of mobile communication technique promotes remote chemical remarkably, and the remote electrocardiosignal monitor systems based on wireless network are developed all around the world, monitor center can acquire patient's electrocardiosignal through the wireless network from anywhere and at any time.In this thesis, a remote electrocardiosignal monitor system based on CDMA is developed by us.Electrocardiosignal is very weak and easily interfered, To cope with the difficulties amplifier and filter circuits are designed to filter the interference signals and amplify electrocardiosignal to appropriate scale. Simulation and real test both indicate that it can meet the operational requirement.To reduce the data rate of multiple lead electrocardiosignal, a data compression algorithm based on integer-to-integer wavelet transform is introduced to compress the multiple lead electrocardiosignal. The algorithm achieves good compression rate, reduces the transmission cost and keeps a good enough precision.Dual-processor structure including Microcontroller and DSP is adapted in monitor terminal to accomplish analog-to-digital convert and data compression. Additional, FPGA is used to implement all decode logic circuits and transformation between serial signals and parallel signals, which saves PCB space remarkably. The monitor terminal transmits data by CDMA Data Terminal Unit which is controlled through serial port.Communitation software is also developed, which implements data transmission between monitor terminal and monitor center. |
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