Apparatus for extracting time-frequency features of ultrasound doppler fetal heart sound signal

摘要

An apparatus comprises an ultrasound fetal heart probe, amplifier, CPU, display screen, all connected to a power source. Time-frequency features are extracted. A normal heart sound signal and an abnormal heart signal are similar in the time domain and differences can be difficult to observe. The display may output the time-frequency features. A doctor may be assisted in clinical monitoring and disease diagnosis of a fetus in uterus.