Fetal heart sound signal detection and processing device

Abstract

The invention provides a fetal heart sound signal detection and processing device. The fetal heart sound signal detection and processing device comprises a signal detection unit and a signal processing unit. The signal detection unit is used for collecting fetal heart sound acoustic signals and converting the fetal heart sound acoustic signals into fetal heart sound electric signals. The signal processing unit comprises a processing subunit, a feature identification subunit and a calculation subunit. The processing subunit is used for carrying out denoising processing on the fetal heart sound electric signals and extracting signal envelopes of the fetal heart sound electric signals undergoing denoising processing. The feature identification subunit is used for identifying positions of first heart sound waveforms and positions of second heart sound waveforms in the signal envelops. The calculation subunit is used for calculating duration between starting points or finishing points of every two adjacent first heart sound waveforms and of every two adjacent second heart sound waveforms, so that multiple heart rate values based on first heart sounds and multiple heart rate values based on second heart sounds are obtained, and the heart rate values are averaged so that the fetal heart rate can be obtained. According to the fetal heart sound signal detection and processing device, fetuses cannot be influenced when fetal heart sound signals are collected, and the collected fetal heart sound signals can be well processed.

Description

technical field [0001] The invention relates to the technical field of physiological signal detection, in particular to a fetal heart sound signal detection and processing device. Background technique [0002] According to WHO reports, more than 3 million fetuses die during pregnancy every year in the world, and more than 4 million babies die within four weeks after birth. If pregnant women are pregnant, they can check the health of the fetus on time and get corresponding pregnancy and delivery And postpartum care guidance, will greatly reduce fetal and infant mortality. Under normal circumstances, pregnant women start to go to the hospital for periodic fetal health monitoring after 24 weeks of conception. The fetal health monitoring can detect abnormalities such as heart disease in some fetuses, suffocation caused by umbilical cord entanglement, and fetal distress in advance. In order to achieve eugenics, fetal health and safety prevention, it can greatly reduce the mortal...

AI Technical Summary

Problems solved by technology

[0005] At present, ultrasound Doppler is generally used for fetal heart monitoring in the abdomen of pregnant women. In this method, a certain amount of ultrasound is emitted by the ultrasound probe to act on the fetal heart. When the fetal heart beats, it will reflect the ultrasound. The received ultrasound can be analyzed accordingly to obtain the activity information of the fetal heart (such as fetal heart sound). This method has the advantages of mature technology and convenient implementation. When acting on the fetus, it will stimulate the fetus and intensify its activity, which will cause errors in the test results; in addition, the fetal heart rate monitoring can also use a stethoscope, such as using a high-sensitivity stethoscope to listen to the fetal heart sound at an appropriate position in the pregnant woman's abdomen , this method is a passive detection of fetal heart sound, which will not have any impact on the fetus. However, since fetal heart sound is a weak low-frequency nonlinear and non-stationary physiological signal, the main frequency band is within 20-200Hz, and ordinary The stethoscope is not suitable, and the high-sensitivity stethoscope is too expensive. Moreover, it is difficult to find the fetal heart rate by using the stethoscope, and it is difficult to popularize

At the same time, when fetal heart sounds are transmitted outward through amniotic fluid, uterus and other abdominal tissues and organs of pregnant women, they will be interfered by external noise, fetal movement, heart sounds of pregnant women, abdominal blood flow sounds, bowel sounds, etc. The obtained fetal heart sound signal is very complicated, but the existing ultrasonic Doppler method and stethoscope method are relatively simple to process the collected fetal heart sound signal containing noise, and the error of the processing result is relatively large

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