Electronic enthusiasts core tips : This article introduces the use of the MSC1210 microprocessor with its own 24-bit A / D converter as the core device. The wavelet analysis algorithm processes data as the key technology, and analyzes the monitoring indicators by comparison, using alarms, interface prompts and Intelligent computer fetal monitoring system that starts vibrator mode to remind and automatically take corresponding measures. Clinical experiments show that the system has high detection accuracy, good real-time performance and precise and friendly intelligent control.
1 Introduction
The monitoring of the fetus during the perinatal period and the delivery process can promptly detect critical symptoms such as intrauterine hypoxia and distress, reduce fetal mortality, and improve the quality of delivery. The traditional fetal monitoring system is more complicated, has higher power consumption, and more human interference, which is not convenient for family monitoring and self-monitoring.
The intelligent fetal monitoring system selects the MSC1210 microprocessor with 24-bit A / D converter and strong analog performance and digital processing capacity produced by TI. The microprocessor selects, buffers, amplifies, and adjusts the input channels. A / D conversion and digital processing are integrated into a single-chip circuit, and only one integrated circuit can be used to achieve data collection of fetal heart rate, uterine contraction pressure, and number of fetal movements, and control of the voice device and the vibrator. The control basis of intelligent fetal monitoring is fetal heart rate. How to accurately and timely obtain fetal heart rate is the control premise of intelligent fetal monitoring system. For the fetal heart rate Doppler signal has the characteristics of low signal-to-noise ratio and non-stationary randomness, 1/2, 2/3 and 2 times heart rate appear when calculating the fetal heart rate, resulting in control errors. Here, wavelet analysis combined with double threshold algorithm , Accurate and real-time fetal heart rate to ensure the effective implementation of intelligent control.
2. Hardware design of intelligent computer fetal monitoring system
2.1 Intelligent computer fetal monitoring system structure
The block diagram of the intelligent computer fetal monitoring system is shown in Figure 1. It is mainly composed of ultrasonic Doppler fetal heart probe, contraction probe, fetal movement probe, fetal heart signal conditioning circuit (low-pass filtering, absolute value calculation and envelope extraction, etc.), contraction pressure signal conditioning circuit, voice control, vibrator , MSC1210 microprocessor and computer processing system. With MSC1210 and computer processing system as the core.
MSC1210 controls the collection and communication of monitoring indicators and receives computer commands to control the voice and vibrator. The computer system implements functional modules such as intelligent control, communication control, data processing algorithms, and monitoring display.
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