Abstract:Using microprocessor techniques, a portable digital memory device has been designed for the ambulatory monitoring of heart rate and physical activity. The device consists of a microprocessor, an ECG amplifier to record the heart rate and an accelerometerto detect the physical activity. This accelerometer is piezoresistive and is suitable for ambulatory physical activity recording, because this sensor requires low electrical power, has high durability and wide frequency response (DC~1.2 kHz). Changes in hearti rates and physical activity in daily life have been successfully recorded.
A 32-bit microprocessor, the T X 2 , with efficien.2 testable designs, has been developed. For manufacturing test, a combinaiion of powerful BISTs and parallel scan design is implemented. The BISTs achieze 100% funciional coverage for ROM, RAM and P L A and 78%: coverage of single stuck-at faults of the remaining pari of ihe T X 2 including redundant faults. Scan test vectors obtained b y A T P G have enhanced the corerage i o 84%. Total lest time is less ihan 2 seconds. There are also a few circuitry for efficient design zerification. Moreover, f o r higher test quality, Idd,q test is implemented. Total area overhead is 6.9%
It is very important to get the change of biosignals in our daily life in order to make a diagnosis and treat patients in the clinical field, and also important to know the mechanism of our body in the research field. We have developed an ambulatory biosignal memory device to get various kinds of biosignal in our daily life away from the laboratory. Our device is a kind of portable battery-driven microprocessor-based computer system, and this system consists of Z80CPU, 64KB memory, real time clock, serial interface, 10 bit resolution A/D converter and optional circuit added according to the aim of measurement.Here discussed are what such an ambulatory monitoring system should be and of what kind of technological problem should be solved. As a result, it is confirmed first that our ambulatory monitoring device can bring many kinds of useful information about the change of our condition. And at the same time, it is clarified that the insufficiency of memory capacity is the most significant problem of such a digital memory device as our system. Then IC memory card is added as a sub memory, and real time data compression technique is tested here. The result showed that by using these technique, a digital type ambulatory biosignal memory device can have the sufficient memory capacity even in the clinical application.
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