Multi-format，multi-sampling Frequency Physiological Signals Management And Real-time Playback System

The most important indications of human life contains five physiological parameters, theyare ECG, blood pressure, respiration, oxygen saturation and body temperature. Variousphysiological parameters in patients with chronic diseases need to be monitored anytime,anywhere, in addition the majority of patients with chronic diseases have the ability to movefreely, but the wired connection is the traditional way which the head of a bed multiplephysiological parameters monitoring equipment used, so that patients can only stay in thehospital and hospital beds to be monitored. In this context, family-oriented, individual multiplephysiological parameters remote monitoring system gradually become a hot topic in the field oftelemedicine technology. With the help of multiple physiological parameters remote monitoringsystem, the patient’s physiological parameters can be sent to the remote doctor anywhere, so thepatient can get medical treatment timely. The ability of human brain in the recognition of digitalinformation and analog information is different, for the analog information recognition capabilityto simulate graphically expressed stronger, thus real-time dynamic display of physiologicalparameters curve is a key issue to be addressed in the multiple physiological parameters remotemonitoring system. The achievement of the multiple physiological parameters remote monitoringsystem improved the level of primary care medical units.Multi-format, multi-sampling frequency physiological signals management and real-timeplayback system is an important part of the multiple physiological parameters remote monitoringequipment development, the system regards the standard database data file which published inthe PhysioNET as a sample signal to read research and real-time playback, using Visual C++6.0development tools to create multi-format, multi-sampling frequency physiological signalsmanagement and playback software platform. The system first read through the VC++Programming a multi-format, multi-sampling frequency physiological data on the PC display itswaveform, and then after D/A hardware device using an oscilloscope D/A converter outputwaveform to achieve the output waveform with the original waveform playback simultaneously.The system can be used as an analog signal source, and laid the foundation for the developmentof multiple physiological parameters remote monitoring equipment.This thesis has finished the following issues of the research work: Firstly, this paper has introduced the project to use multi-format, multi-sampling frequencyphysiological signals database, detailed description of the characteristics of each database log filetheir reading, including the "212" multi-sampling frequency data format reading, the "16"multi-sampling frequency data format reading, the "80" data format reading and the"EDF/EDF+" data format reading. Specific reading process: first reading the header record of theoriginal data, the number of channels, sampling frequency, multiples of the sampling frequencyamplification, the sampling points, the name of the data file, the data storage format, and otheruseful information read into the computer memory; then the data record is read into memoryaccording to some useful information such as the read document data storage format, and tostrive for the protection system for the future use of the raw data.Secondly, this paper has described the design of the management and playback system,including the design of software and the design of hardware in detail. Hardware devices based onCortex-M3core of the new32-bit microcontroller STM32F103RCT which STMicroelectronicsdeveloped as the master chip, first PC applications via USB2.0continued to the STM32senddata, and then using the SPI sent the USB endpoints receive buffer received data to the registersof the DAC8568continuously, DAC8568D/A converter timer trigger, and finally displayed onan oscilloscope analog signal. The design of the software platform based on Visual C++6.0MFC framework, by the data file management module, real-time playback module, the data filesettings module, range management module and attributes module of five modules. The data filemanagement module is responsible for the file to read the database records, transforming theformat of the physiological data; real-time playback module is responsible for the selected signalto send data to the hardware device, data D/A playback, the PC real-time multi-threadingtechnology simultaneously displayed D/A conversion data waveform; the data file settingsmodule is responsible for adjusting the width of the waveform amplitude and time; the intervalmanagement module is responsible for selecting the start and end of the playback interval, saveinterval data; the attribute module is responsible for displaying the basic properties of the file.1mV signals generated by1mV square wave signal generator as a standard can be used to verifythe correctness of the display waveform after opening library file.Finally, the key technology used in the design of software platform, including MFCFoundation Class Library, MFC double buffering graphics technology, multi-threadingtechnology, application software programs Release released these key technologies applicationsto ensure the stability of the platform, efficient operation.Multi-format, multi-sampling frequency physiological signals management and playbacksystem platform, the function of each module to achieve good. The system can be used as analog source for the multiple physiological parameters remote monitoring equipment, also can be usedfor computer simulation and validation of the algorithm, and laid the foundation for thedevelopment of the multiple physiological parameters remote monitoring equipment.