Method for waveform sampling and reconstitution for oscillographs

A waveform sampling and oscilloscope technology, applied in the field of signal processing, can solve problems such as signal mixing, measurement signal not being band-limited, sampling difficulty, etc.

Inactive Publication Date: 2008-08-13
JIANGSU LVYANG ELECTRONICS INSTR GROUP
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  • Abstract
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  • Claims
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Problems solved by technology

In practice, the signal is often mixed with some burst noise, which is not a band-limited signal, which leads to the measurement sign

Method used

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  • Method for waveform sampling and reconstitution for oscillographs
  • Method for waveform sampling and reconstitution for oscillographs
  • Method for waveform sampling and reconstitution for oscillographs

Examples

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example 1

[0007] Example 1, the waveform sampling and reconstruction method for the oscilloscope. The signal in the oscilloscope is regarded as a combination of a band-limited signal and a group of burst noise, where the bandwidth of the band-limited signal is L, the period is τ, and the parameter W is given.

[0008] The steps of waveform sampling are as follows:

[0009] Step 1: In a cycle τ, count the number of points whose statistical magnitude exceeds the parameter W, denoted as K.

[0010] Step 2: enter the low-pass filter h(t)=B sinc(Bt) to the waveform signal, where sin c ( Bt ) = sin ( πBt ) πBt , B = 2 L + 4 K + 4 ...

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Abstract

The present invention provides a method for sampling and rebuilding waveform of oscillograph including: calculating the number of burst noise in each period of wave signal in oscillograph, sampling uniformly according to a certain frequency after signal passed a lowpass and storing in oscillograph. In the signal rebuilding process, firstly resuming burst noise by new arithmetic and resuming whole signal waveforms containing burst noise by rebuilding method of band-limited signal based on the known burst noise. The sampling rate can be reduced and the storage capacity of oscillograph is improved using periodicity of signal. The signal in oscillograph with burst noise isn't band-limited signal any more, and can't be resumed original signal exactly by classical sampling method of band-limited signal, so the new method of waveforms sampling and rebuilding is provided to resume original signal exactly and the method has a good robustness.

Description

technical field [0001] The invention proposes a method for sampling and reconstructing waveforms of oscilloscopes, more specifically, sampling and storing waveforms of oscilloscopes, and reconstructing waveforms with sampled data, which belongs to the technical field of signal processing. Background technique [0002] Current high-speed real-time digital oscilloscopes use waveform sampling and reconstruction techniques to achieve the goal of storing and displaying analog waveforms on digital devices. Waveform sampling and reconstruction techniques are based on the Shannon-Whittaker sampling theorem. This theorem proves that a finite bandwidth signal can be discretized without losing any information. Nyquist further pointed out that as long as the sampling frequency is greater than twice the signal bandwidth, we can restore the original signal from the digital signal without distortion. The current common practice in oscilloscope design is to use an analog-to-digital conver...

Claims

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Application Information

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IPC IPC(8): G01R13/02
Inventor 陆建印德荣
Owner JIANGSU LVYANG ELECTRONICS INSTR GROUP
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