Under normal condition the mechanical action of fetal heart produces two distinct sound S1 and S2 in each cardiac cycle. The sound S1 is heard due to the closure of mitral and tricuspid valves, while S2 is heard due to the aortic and pulmonary valves. Along with these sounds some noises of very low amplitude with frequency between 0 to 25 Hz also produced due to fetal movement, mother heart sound [16]. The circulation of
Under normal condition the mechanical action of fetal heart produces two distinct sound S1 and S2 in each cardiac cycle. The sound S1 is heard due to the closure of mitral and tricuspid valves, while S2 is heard due to the aortic and pulmonary valves. Along with these sounds some noises of very low amplitude with frequency between 0 to 25 Hz also produced due to fetal movement, mother heart sound [16]. The circulation of