Method for automatically positioning and repairing clipping distortion waveforms of electronic stethoscope
An electronic stethoscope and clipping distortion technology, which is applied in the field of stethoscopes, can solve the problems of automatic detection and positioning of the clipping distortion area of the stethoscope, automatic repair of the clipping distortion area, and unrepairable clipping distortion area. The effect of high accuracy
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Embodiment 1
[0061] Read a piece of lung sound auscultation data x of a child with pneumonia, which contains two clipping distortion areas, and automatically locate and repair the clipping distortion areas. The data sampling rate is 4KHz and the duration is 2.5 seconds.
[0062] First, calculate the difference of this segment of data, the difference signal x d Such as image 3 As shown in (a), it can be seen that there are a pair of peaks with opposite polarities and large amplitude at the beginning and end positions of the two clipping distortion regions.
[0063] Then, find the differential signal x d The time point corresponding to the value whose absolute value is greater than the threshold 0.8×max(|x|), from which to find the adjacent x d Two pairs of time points with opposite signs of the corresponding values above can be paired to detect two clipping distortion regions and determine their respective start points and end points, see image 3 as shown in (b);
[0064] Finally, t...
Embodiment 2
[0066] Read a piece of normal heart sound auscultation data x, there are 5 clipping distortion areas in the data, among them, two clipping distortion areas are very close, with a distance of 0.0136 seconds, and the clipping distortion area is automatically located and repaired , the data sampling rate is 4KHz, and the duration is 1.5 seconds.
[0067] First, calculate the difference of this segment of data, the difference signal x d Such as Figure 4 As shown in (a), it can be seen that there are a pair of peaks with opposite polarities and large amplitude at the beginning and end positions of the five clipping distortion regions.
[0068] Then, find the differential signal x d The time point corresponding to the value whose absolute value is greater than the threshold 0.8×max(|x|), from which to find the adjacent x d By pairing time points with opposite signs of the corresponding values above, all 5 clipping distortion areas can be detected and their respective start point...
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