Fetal heart rate recognition method, device and system based on multi-sensor array

Abstract

The invention discloses a method, device and system for identifying a fetal heart rate based on a multi-sensor array. The method includes: dividing the abdominal area into several grids, and placing a sound sensor at each specific position; collecting multiple sound sensors The data is sampled synchronously at the same frequency to obtain multiple sound sampling sequences; the adjacent pairwise difference method is used to form a differential sound vector for the sound sampling sequence; the differential sound vector is multiplied by the audio transfer matrix to restore the sound source sound intensity vector; according to the sound source Calculate the sound intensity vector to obtain the power density heat map of all grids in the abdominal area, and judge whether there is a peak in the power density heat map; if there is a peak, calculate the suspected fetal heart rate and confidence level of each peak, and set the confidence level higher than The grid corresponding to the peak value of the threshold is used as the location of the fetal heart rate, and the suspected fetal heart rate is output as the recognized fetal heart rate. The invention effectively reduces the interference of maternal noise and environmental noise, and does not need to search for the fetal heart rate during use, and the use experience is better.

Description

technical field [0001] The present invention relates to fetal heart rate identification, in particular to a method, device and system for identifying fetal heart rate based on a multi-sensor array. Background technique [0002] During pregnancy, especially in the middle and late stages of pregnancy, various indicators of the fetus can be monitored to understand the health status of the fetus in the womb and detect fetal abnormalities early. The main purpose of monitoring the fetal heart rate is to obtain the real-time heart rate of the fetus. Whether the fetal heart rate is normal is an important indicator for judging whether the fetus is hypoxic in the mother's body. Therefore, fetal heart rate monitoring is an important item of pregnancy inspection. [0003] The existing active fetal heart rate monitoring equipment mostly adopts ultrasonic radiation to obtain the fetal heart rate. This way of obtaining the fetal heart rate is realized based on the principle of ultrasound ...

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Problems solved by technology

Due to the large interference of maternal abdominal murmurs, generally speaking, the function can only be realized in a quiet environment; the quality of the fetal heart sound signal is also related to the position of the fetus. When the position is not good, the fetal heart sound cannot be heard clearly, and it is difficult to pick up the effective fetal heart sound. It is difficult for pregnant women with no practical experience to find a suitable fetal heart sound listening position

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