This study describes the design of the portable intelligent Holter system which can record and analyze the ambulatory ECG data.
System hardware consists of the one chip microcomputer(8OC31), A/D, ROM, RAM, LCD display and two preamplifiers, power circuits, control logic circuits. A/D converted data were differentiated and low pass filtered. The detection of QRS complex and R point were accomplished by software algorithm based on adaptive threshold computed on low pass filtered signal. Using this system, the trends of the parameters-RR, PR, QT, QS intervals-during the long term could be observed. Also it can be utilized as ambulatory monitor for serious cardiac patients.
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