Abstract
An ECG monitoring device with the use of audiofrequency modulation is proposed. In this device, ECG wave form is modulated in pulse frequency and converted into symmetric square wave through flip-flop circuit. The frequency corresponding to the base line of ECG is chosen between 400 to 800 Hz and maximum sensitivity is about 300 Hz/mV. Experimental results indicate that several features of ECG wave form such as arrhythmias, P or T wave inversion, S-T segment depression and extrasystoles can easily be differentiated.
This method is advantageously applicable not only to a long-term ECG monitoring but to portable ECG device or to ECG transmission through conventional telephone lines.
