A parallel compression sensing method for multi-channel synchronous acquisition of heart sound signals
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A multi-channel synchronization and heart sound technology, applied in the direction of diagnostic signal processing, sensors, medical science, etc., can solve the problem of long-term standby of diagnostic equipment, and achieve the effect of rich feature extraction methods, strong scalability, and full mining
Active Publication Date: 2019-01-15
NANJING UNIV OF POSTS & TELECOMM
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Therefore, how to store heart sound signal data, make the diagnostic equipment stan
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Embodiment 1
[0051] refer to figure 1 As shown, the parallel compressed sensing method of multi-channel synchronous acquisition of heart sound signal of the present invention comprises the following contents:
[0052] (1) Processing of undersampling of multi-channel heart sound signals
[0053] Let the heart sound signal of multi-channel synchronous acquisition be: x=[x 1 ,x 2 ,...,x l ](l∈R), and x i =s 1i +s 2i , where S 1i ,S 2i , is the main component of the heart sound signal: the first heart sound signal and the second heart sound signal.
[0054]In compressed sensing theory, data sampling should try to satisfy random characteristics, and the traditional sampling method—resampling may cause important information to be lost. The heart sound signal has obvious sparse characteristics, and it is necessary to collect as much data as possible in the center of the heart sound signal, and randomly undersample the edge data. Therefore the present invention proposes the subsampling m...
Embodiment 2
[0073] This embodiment is to realize the parallel compressed sensing of four channels of synchronous collection of heart sound signals.
[0074] Since the heart sound signal has obvious sparse characteristics, it is necessary to collect as much data as possible in the center of the heart sound signal, and then randomly undersample the edge data. In this embodiment, four channels of synchronously collected heart sound signals are subjected to under-sampling processing, and then Fourier transform is performed to obtain a Fourier expression form of the heart sound signal.
[0075] Because for the heart sound signals in the auscultation area of the aortic valve (Aortic, A) and pulmonary valve (Pulmonic, P), the second heart sound S2 is stronger, and the first heart sound S1 is weaker; and for the mitral valve (Mitral, M) and For the heart sound signal in the tricuspid (Tricuspid, T) auscultation area, the first heart sound S1 is stronger and the second heart sound S2 is weaker. ...
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Abstract
The invention discloses a parallel compression sensing method for multi-channel synchronous acquisition of heart sound signals. The method firstly includes , according to the time-frequency domain properties of multi-channel heart sound signals collected synchronously, selecting one main signal and analyzing the correlation between other signals and the main signal; then compressing the main signal by using the test matrix, and converting the problem of recovering the original signal from the observation matrix into the problem of solving the minimum norm to realize the reconstruction of the main signal; and reconstructing the main signals and finally reconstructing other signals according to the correlation between the main signal and other signals, so as to realize the parallel compressed sensing of multi-channel heart sound signals. By processing the main signal, the method realizes the parallel compression sensing of the multi-channel heart sound signals, greatly improves the reconstruction and feature extraction speed and accuracy of the multi-channel heart sound signals, realizes the long-term monitoring and storage of the heart sound signals, and improves the reliability ofvarious predictions based on the heart sound signals. The invention can guarantee the wearable equipment to run for an ultra long time under the energy-saving state, and further can promote the application of the parallel compression sensing processing technology to other biological signals collected synchronously in multiple channels.
Description
technical field [0001] The invention relates to the technical field of primary screening and monitoring of related diseases, such as monitoring of cardiovascular diseases and prevention of sudden death of heart failure, in particular to a parallel compressed sensing method for synchronously collecting multi-channel heart sound signals. Background technique [0002] With the improvement of living standards and the development of intelligent technology, cardiovascular disease is no longer synonymous with the elderly. According to the "China Cardiovascular Disease Report 2017" data released by the National Center for Cardiovascular Diseases, the number of patients with cardiovascular diseases in China It has been as high as 290 million, that is, 2 out of every 10 adults suffer from cardiovascular disease, and about 3.5 million people die of cardiovascular disease every year. Therefore, the monitoring of cardiovascular disease is very important. In recent years, in order to mak...
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