Abstract— One way of checking on a pregnant woman is inspection using ultrasonic wave Doppler technique, this check is done by putting Doppler ultrasonic waves over the abdomen to capture the heart beat of the fetus with the addition of the gel material, there sebaga in pregnant women who are allergic to the gel material. Alternatively we can use the technique in frassonik waves. With a digital design II Chebyshev band pass filter with a frequency range of 2-3Hz, the heart rate of pregnant women with fetal heart beat can be distinguished. With the help of software MatLab and Xilink will be resolved in the manufacture of digital filter terser but. The simulation results with the software quite satisfactory.
Keywords— heartbeat, infrasound.
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