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Method for extracting complete periodic waveform

A technology of periodic waveform and extraction method, which is applied in the field of signal processing, can solve problems such as unfavorable data analysis, unstable results, unfavorable waveform for scientific research, etc., and achieve the effect of overcoming interference and facilitating acquisition

Inactive Publication Date: 2018-10-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The starting point of the single-cycle waveform extracted by the slope method starts from the point where the slope of the falling edge (rising edge) changes the most. Since the starting point of the waveform intercepted by the slope method is not at the starting point of the rising edge, it is not conducive to data analysis, and the waveform has glitches. will make the result unstable
[0005] Threshold method, set a start threshold and stop threshold respectively. If the start threshold and stop threshold are different, the intercepted waveform may not be a complete cycle waveform; if the start threshold and stop threshold are the same and the size does not exceed the peak trough value, then a complete cycle of the waveform can be intercepted, such as figure 2 shown, but the starting point of the complete cycle waveform can be anywhere on the waveform, so the waveform intercepted by this method is also not conducive to scientific research

Method used

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  • Method for extracting complete periodic waveform
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Embodiment Construction

[0043] The embodiments of the present invention will be further described below in conjunction with the drawings.

[0044] In this embodiment, the sampling frequency represents the number of signals extracted from continuous signals per second to form discrete signals, and f s Means

[0045]

[0046] Where f s Represents the sampling frequency, N T Represents the number of acquisition points in a cycle, and T represents the waveform cycle.

[0047] In this embodiment, the sampling period is the reciprocal of the sampling frequency and refers to the time interval between samples

[0048]

[0049] Where T s It is the sampling period.

[0050] See image 3 , The present invention provides a method for extracting a complete periodic waveform, which is specifically implemented by the following steps:

[0051] Step 1. Acquire a multi-period waveform, use a threshold trigger at adjacent falling edges to intercept a single-period first waveform with a period of T, and use a threshold trigger at ...

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Abstract

The invention provides a method for extracting a complete periodic waveform, belonging to the signal processing field. The invention adopts the technology of combining global local extremum, successfully overcomes the interference of waveform glitch, intercepts the complete periodic waveform from the starting position of the rising edge, and facilitates the acquisition of the periodic signal waveform in scientific research.

Description

Technical field [0001] The invention belongs to the field of signal processing, and particularly relates to a method for extracting a complete periodic waveform. Background technique [0002] Pulsed square waves, harmonics, triangle waves, etc. are widely used in electronic circuits, information communications, radar detection, and non-destructive testing. Because of the periodicity of the waveform, it is often only necessary to intercept a complete cycle of the waveform for research in the field of scientific research, so it is accurate It is very important to intercept a complete cycle waveform. [0003] At present, the commonly used methods to intercept a periodic waveform include the slope method and the threshold method. Take pulse square wave as an example to illustrate these two methods. [0004] The slope method uses the position where the slope of the two adjacent falling edges (or rising edges) of the pulse square wave changes the most as the start and end points of the w...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06F2218/10
Inventor 于亚婷叶朋鑫牛阔薛珂田贵云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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