Fetal heart rate calculation method and wearable heart and lung sound wireless monitoring system

Abstract

The invention discloses a fetal heart rate calculation method which comprises the following steps: preprocessing a fetal heart sound signal X to remove noise to obtain fetal heart sound data X' after noise reduction; performing audio framing on the fetal heart sound data X' after noise reduction, after framing, the fetal heart sound signal of the ith frame being X'i, and the time vector corresponding to each frame being T; calculating short-time energy ei of the X'i, and generating a short-time energy vector E; finding out the maximum value emax of the short-time energy vector E, and setting an energy threshold thr; comparing the value of the short-time energy vector E with an energy threshold thr, recording time points Ti corresponding to all frames of which ei is greater than or equal to thr, and generating a short-time energy peak time vector T '; calculating the T' forward difference of the peak time vector, obtaining time difference vectors, working out the average value of the time difference vectors, and the fetal heart rate can be obtained. The fetal heart rate can be rapidly and accurately calculated, a certain anti-interference capacity is achieved, and meanwhile the wearable heart and lung sound wireless monitoring system used by the method is provided.

Description

technical field [0001] The invention belongs to the field of biomedical signal processing, and in particular relates to a fetal heart rate calculation method and a wearable heart-lung sound wireless monitoring system. Background technique [0002] During pregnancy, especially in the pre-labor period, it is necessary to monitor various physiological indicators of the fetus, which helps to understand the health status of the fetus. Fetal heart rate monitoring can obtain the real-time heart rate of the fetus, and the fetal heart rate is an important physiological indicator for judging whether the fetus is hypoxic or distressed in the mother's body. [0003] Fetal heart rate monitoring mostly uses Doppler ultrasound equipment. The principle of Doppler ultrasonic detection of fetal heart rate is to use a probe capable of emitting ultrasonic waves to emit ultrasonic waves to the position of the fetal heart. When the ultrasonic waves meet the moving heart of the fetus and reflect,...

AI Technical Summary

Problems solved by technology

The routine fetal heart rate monitoring in general hospitals takes about 20 minutes. Pregnant women in the middle and late stages of pregnancy usually need to perform fetal heart rate monitoring once every one to two weeks, which brings inconvenience to pregnant women and their families.

[0004] In addition, it is theoretically shown that ultrasound has certain thermal and acoustic effects on human tissues, but the impact on fetal health is not yet clear

Moreover, ultrasound Doppler equipment requires couplant, which also reduces patient comfort

Images