Digital Filter Design of Infinite Impulse Response (IIR) Infrasound to Detect Fetal Heart Rate
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.
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Introduction
1.1 Background Research: Since the beginning of pregnancy, it is advisable to conduct regular control to the nearest obstetrician. During the inspection control is highly dependent on the doctor or clinic in question, but in general here is given the type of examinations performed and it is necessary to ensure the health of mother and baby during pregnancy to child birth. One of these checks is the examination with Doppler ultrasound, 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.
Conclusion
Designs of Digital IIR Bandpass Filters have been achieved. A number of findings have identified during the design and simulation phases, as follows:
1. IIR filter can be implemented based FPGAs.
2. The coefficient of the IIR filter design has been done by calculation. VHDL has been used to get into the hardware description. VHDL code has been written, synthesized, mapped and then successfully configured with a prototype. IIR filter is designed completely in accordance with the design requirements.
3. In testing the filter circuit is still a difference between the results of Matlab simulation program to program Xilinx. This is influenced by the use of dividers components that perform the division process with the result of rounding.
4. One of the problems in the process simulation program Xilinx is the use of integer data, where data from the fraction should rounding first.
5. The results of the FPGA board to produce the same output analog signals with analog signal input. So that this algorithm is correct and appropriate, the file * .ucf can be used to make chips infrasound.