Passive Acoustic Signal Acquisition System for Non-Invasive Fetal Heart Sound Monitoring Applications.

10.5580/55f ◽  
2010 ◽  
Vol 5 (1) ◽  
Keyword(s):  
Acoustic Signal ◽  
Heart Sound ◽  
Fetal Heart ◽  
Acquisition System ◽  
Signal Acquisition ◽  
Non Invasive ◽  
Monitoring Applications ◽  
Passive Acoustic

Design of the Underwater Acoustic Signal Acquisition System Based on the Pipelined Twin-AD

2011 ◽  
Vol 383-390 ◽  
pp. 497-502
Author(s):  
Guo Ku Zhao ◽  
Shu Shi Ning ◽  
Zhao Wei Cai ◽  
Ze Qian Xu
Keyword(s):  
Data Acquisition ◽  
Acoustic Signal ◽  
High Frequency ◽  
Digital Signal ◽  
Acquisition System ◽  
Signal Acquisition ◽  
Acquisition Rate ◽  
Underwater Acoustic ◽  
High Data ◽  
Underwater Acoustic Signal

In order to improve the accuracy of the underwater acoustic detection effectively, the digital signal acquisition circuxcA`\\it is a necessary deceive, which must have enough high data acquisition rate. Therefore the high frequency operating clock is employed in the traditional digital signal acquisition circuit. However, the high frequency operating clock will bring troubles to the design of hardware and software, and the power consumption and interference of the system are both increased. According to the principle of the pipelined system, the operation of AD deceive is divided into two process, including the conversion starting and data reading. The FPGA is employed to produce control signals which make twin-AD work in proper state. The design of the underwater acoustic signal acquisition system based on the pipelined twin-AD is presented here. On the base of the system design, simulation, implementation, the hardware experiments are completed. The results show: driven by the operating clock with same frequency, the underwater acoustic signal acquisition system based on the pipelined twin-AD can obtain the acquisition rate which is twice as the traditional data acquisition system.

Embedded Acquisition System for the Lung Sound Signal Based on STM32 Microcontroller

2014 ◽  
Vol 687-691 ◽  
pp. 3441-3445
Author(s):  
Li Ya Zhang ◽  
Zhui Hui Xu
Keyword(s):  
Cardiovascular Disease ◽  
Diagnostic Methods ◽  
Sound Signal ◽  
Acquisition System ◽  
Signal Acquisition ◽  
Lung Sounds ◽  
Lung Sound ◽  
Non Invasive ◽  
Accurate Detection ◽  
Reliable Design

The accurate detection of lung sounds is the premise and infrastructure to achieve non-invasive diagnosis of cardiovascular disease, and the disease noninvasive diagnostic methods based on cardiovascular lung sounds have non-invasive, fast, convenient, and economic characteristics. According to this, the embedded acquisition system for lung sound signals is designed based on the STM32 microcontroller, Stethoscope and electrets microphone is adopted as the lung sound signal acquisition module. The experiment is done based on this system, and the result shows that this designed system working properly, and reliable design.

scholarly journals Non-Invasive Fetal Electrocardiogram Monitoring Techniques: Potential and Future Research Opportunities in Smart Textiles

Signals ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 392-412
Author(s):  
Geetika Aggarwal ◽  
Yang Wei
Keyword(s):  
Heart Rate ◽  
Fetal Heart Rate ◽  
Fetal Heart ◽  
Skin Penetration ◽  
Future Research ◽  
Fetal Electrocardiogram ◽  
Smart Textiles ◽  
Non Invasive ◽  
Future Research Directions ◽  
Electrocardiogram Monitoring

During the pregnancy, fetal electrocardiogram (FECG) is deployed to analyze fetal heart rate (FHR) of the fetus to indicate the growth and health of the fetus to determine any abnormalities and prevent diseases. The fetal electrocardiogram monitoring can be carried out either invasively by placing the electrodes on the scalp of the fetus, involving the skin penetration and the risk of infection, or non-invasively by recording the fetal heart rate signal from the mother’s abdomen through a placement of electrodes deploying portable, wearable devices. Non-invasive fetal electrocardiogram (NIFECG) is an evolving technology in fetal surveillance because of the comfort to the pregnant women and being achieved remotely, specifically in the unprecedented circumstances such as pandemic or COVID-19. Textiles have been at the heart of human technological progress for thousands of years, with textile developments closely tied to key inventions that have shaped societies. The relatively recent invention of smart textiles is set to push boundaries again and has already opened the potential for garments relevant to medicine, and health monitoring. This paper aims to discuss the different technologies and methods used in non-invasive fetal electrocardiogram (NIFECG) monitoring as well as the potential and future research directions of NIFECG in the smart textiles area.

Study of the Metal Crack Propagation by Acoustic Emission Testing

2011 ◽  
Vol 105-107 ◽  
pp. 2179-2182
Author(s):  
Wei Min Zhang ◽  
Shu Xuan Liu ◽  
Yong Qiu ◽  
Cheng Feng Chen
Keyword(s):  
Acoustic Emission ◽  
Crack Propagation ◽  
Acquisition System ◽  
Signal Acquisition ◽  
Sensor Signal ◽  
Acoustic Emission Sensor ◽  
Axial Tension ◽  
Emission Testing ◽  
Acoustic Emission Testing ◽  
Signal Operating

Crack propagation is the main reason which leads to the invalidity of the metal components. A set of detecting equipment based on the acoustic emission method was designed, and it was mainly composed of acoustic emission sensor, signal operating circuits and signal acquisition system. Specimens of 16MnR material were manufactured and the static axial tension test of them was carried on. Acoustic emission signals from the specimen were detected by acoustic emission equipment by using piezoelectric ceramic sensor. Signal datum were acquired and operated by the acquisition system, as well as the acquisition program written for it. The final results has demonstrated that acoustic emission equipment designed for the test performed well in acquiring the signals induced by the metal crack propagation.

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