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Magnetic induction cardiopulmonary activity signal separation method based on Fast-ICA method

A signal separation and magnetic induction technology, applied in the field of biomedical engineering, can solve problems such as inability to directly filter and extract, cover up, and small heartbeat amplitude

Inactive Publication Date: 2014-01-29
ARMY MEDICAL UNIV
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Problems solved by technology

Although the respiratory frequency is obvious, direct extraction can be considered, but the bandwidth of the respiratory process is relatively wide, and the high-frequency phase components of breathing are mixed with the phase corresponding to the frequency of cardiac activity, and the heartbeat amplitude is obviously small, which is easily disturbed by respiratory harmonics and other Masked by components, even if enhanced during preprocessing, it cannot be directly filtered and extracted

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  • Magnetic induction cardiopulmonary activity signal separation method based on Fast-ICA method
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Embodiment Construction

[0019] A non-limiting embodiment is given below in conjunction with the accompanying drawings to further illustrate the present invention.

[0020] refer to figure 1 , Preferably, in this embodiment, a 12 MHz high-frequency AC sinusoidal signal is used as the excitation magnetic field. The detection coils placed at the symmetrical positions of the left and right thorax will obtain a high-frequency phase-shifted sinusoidal voltage signal with the same frequency as the excitation signal. Send the magnetic induction signals of the left and right thoracic cavities and the reference signals of the same frequency to the PC.

[0021] Such as figure 1 As shown, preferably, in this embodiment, narrowband filters corresponding to frequencies are used to preprocess the two magnetic induction signals, and then send them to the phase detection module. The software filtering is realized by a third-order Butterworth filter, and the filtering bandwidth is set to 0.5MHz. In the phase detec...

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Abstract

The invention discloses a magnetic induction cardiopulmonary activity signal separation method based on a Fast-ICA method. The magnetic induction cardiopulmonary activity signal separation method includes the following steps: sending magnetic induction signals of the left chest and the right chest into a 12MHz narrow-band filter to filter the signals to obtain a left chest phase difference signal and a right chest phase difference signal, conducting wavelet denoising on the left chest phase difference signal and the right chest phase difference signal, adopting the independent variable analyzing method (Fast-ICA) to separate a heartbeat signal and a respiratory signal to achieve synchronous monitoring of magnetic induction cardiopulmonary activity.

Description

technical field [0001] The invention belongs to a method for separating physiological signals in the field of biomedical engineering, and specifically refers to the separation of phase signals of cardiopulmonary activity by using a fast independent variable analysis method in the monitoring of noncontact magnetic induction cardiopulmonary activity. Background technique [0002] Non-contact magnetic induction cardiopulmonary activity monitoring is a new type of heartbeat and respiratory synchronization monitoring technology, which is mainly based on magnetic induction phase shift (MIPS) technology. When non-contact magnetic induction monitors heartbeat, subjects often need to hold their breath artificially to suppress strong breathing interference. This method is not suitable for long-term heartbeat monitoring and heartbeat detection of unconscious personnel. At the same time, heartbeat signals are also mixed in the monitored respiration waveform, which affects the accuracy o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0205
Inventor 许佳秦明新孙建金贵宁旭徐林陈明生
Owner ARMY MEDICAL UNIV
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