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High-stability video triggering method and digital oscilloscope

A high-stability, video-based technology, applied in the direction of TV, color TV, color TV parts, etc., can solve the problem of unstable video triggering, avoid application limitations, reduce the interference of superimposed noise, and improve accuracy and stability effects

Active Publication Date: 2020-02-04
SHENZHEN CITY SIGLENT TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is how to overcome the unstable problem of video triggering in the existing oscilloscope

Method used

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  • High-stability video triggering method and digital oscilloscope
  • High-stability video triggering method and digital oscilloscope
  • High-stability video triggering method and digital oscilloscope

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Embodiment 1

[0033] Please refer to figure 1 , the present application discloses a video triggering method with high stability, including steps S100-S500, which will be described respectively below.

[0034] Step S100, acquire and low-pass filter the video signal to filter out the high-frequency components in the video signal to obtain a filtered signal; the high-frequency components are used to carry the brightness of each display line in each frame of video picture corresponding to the video signal information and colorimetric information.

[0035] It should be noted that the video signal here refers to TV signal, still image signal and visible TV image signal, which should be the digitized form of any standard (NTSC, PAL and SECAM) analog video signal. Several samples are obtained, so that the video signal can be low-pass filtered in a digital processing manner.

[0036] For example Figure 5 and Figure 6 The NTSC video signal shown in , the signal type is a composite video signal,...

Embodiment 2

[0063] Please refer to Figure 10 , on the basis of the video trigger method disclosed in Embodiment 1, the present application also discloses a digital oscilloscope, including a signal input channel 11 , a processing circuit 12 , a memory 13 and a display 14 .

[0064] The signal input channel 11 is formed with an input interface on the interface panel of the digital oscilloscope, and the input interface can be connected to an external analog video signal line, and the signal input channel 11 is mainly used for converting an externally input analog video signal into a digital video signal. And the digitized video signal is sent to the processing circuit 12 for video trigger processing.

[0065] The processing circuit 12 is connected to the signal input channel 11, and is used for controlling, storing and displaying the signal waveform near the trigger position on the video signal according to the video trigger method disclosed in the first embodiment. Specifically, the proce...

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Abstract

The invention discloses a high-stability video triggering method and a digital oscilloscope, and the method comprises the steps: obtaining a video signal, carrying out the low-pass filtering of the video signal, so as to filter a high-frequency component in the video signal, and obtaining a filtering signal; detecting the minimum valley value of each negative pulse in the filtering signal, and calculating and obtaining a comparison level in combination with a preset hysteresis window size; performing digital comparison on the filtering signal according to the comparison level to generate a synchronizing signal; performing video triggering processing according to the synchronization signal to obtain a triggering signal; and controlling to store and display a signal waveform near the triggering position on the video signal according to the triggering signal. The comparison level is calculated by combining the minimum valley value of the negative pulse and the size of the hysteresis window, therefore, digital comparison can be carried out on the filtering signals in each updating period, the application effect of comparison level self-adaptive following is achieved, the application limitation that the comparison level is fixed in the past is effectively avoided, and meanwhile the interference effect of superimposed noise on the filtering signals can be reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of oscilloscope triggering, in particular to a highly stable video triggering method and a digital oscilloscope. Background technique [0002] Analog video signals refer to analog electrical signals carrying continuous video images. In the past, movies and TV programs played by radio stations used analog video signals to transmit video image content between devices. Since the transmission is a continuous video picture, the analog video signal has the concept of line, field, and frame frequency in time, and at the same time, the amplitude change of the electrical signal contains the chrominance and brightness information of the video content. Some analog video signal transmission Type even includes audio information in the signal. At present, there are three main formats of mainstream analog video signals: NTSC, PAL and SECAM. Here, NTSC is taken as an example to briefly explain the analog video signal. ...

Claims

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Application Information

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IPC IPC(8): H04N5/445H04N5/067H04N9/77
CPCH04N5/0675H04N5/44504H04N9/77
Inventor 吴乾科周旭鑫李振军
Owner SHENZHEN CITY SIGLENT TECH
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