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
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[0032] Example one
[0033] Please refer to figure 1 This application discloses a high-stability video triggering method, including steps S100-S500, which will be described separately below.
[0034] Step S100: Obtain and perform low-pass filtering on the video signal to filter out the high-frequency components in the video signal to obtain the filtered signal; the high-frequency component is used to carry the brightness of each display line in each frame of the video picture corresponding to the video signal Information and color information.
[0035] It should be noted that the video signal here refers to TV signal, still image signal and visual TV image signal. It should be a digital form of analog video signal of any standard (NTSC, PAL, and SECAM). It can be obtained by digital sampling, so that the video signal can be low-pass filtered by digital processing.
[0036] E.g Figure 5 with Image 6 The video signal of the NTSC system shown in the signal type is a composite video si...
Example Embodiment
[0062] Embodiment two
[0063] Please refer to Picture 10 Based on the video trigger method disclosed in the first embodiment, this application also discloses a digital oscilloscope, which includes 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. The input interface can be connected to an external analog video signal line, and the signal input channel 11 is mainly used to convert an externally input analog video signal into a digital video signal. The digitized video signal is transmitted 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 to control, store and display the signal waveform near the trigger position on the video signal according to the video trigger method disclosed in the first embodiment. Specifically, the processi...
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