Method and device for eliminating VGA signal jitter

Abstract

The invention discloses a method and device for eliminating VGA signal jitter. The device comprises a first clock buffer, a clock phase-locked loop module, a NOT gate and a trigger, the first clock buffer is connected with the clock phase-locked loop module and the trigger, the clock phase-locked loop module is connected with the NOT gate, and the NOT gate is connected with the trigger. The firstclock buffer is used for acquiring an HS signal in a VGA signal, expanding the HS signal into two circuits and sending the two signals to the clock phase-locked loop module and the trigger; the clockphase-locked loop module is used for generating a first clock signal synchronous with the HS signal according to the HS signal and sending the first clock signal to the NOT gate; the NOT gate is usedfor performing 180-degree phase negation on the first clock signal and sending a negated second clock signal to the trigger; and the trigger is used for sampling the HS signal according to the secondclock signal to generate a jitter-eliminated HS signal. According to the invention, jitter of the HS signal in the VGA signal can be eliminated, and the user experience is improved.

Description

technical field [0001] The present application relates to the field of video technology, in particular to a method and device for eliminating jitter of a Video Graphics Array (Video Graphics Array, VGA) signal. Background technique [0002] The VGA interface is the most widely used interface type on the graphics card, which is used to decompose the video signal into three primary color signals (red R, green G, blue B), vertical synchronization (VSYNC, VS) signal and horizontal synchronization (HSYNC, HS) signal to transfer. [0003] With the continuous development of technology in the video field, the video interface is constantly developing towards the direction of the digital interface, and chip manufacturers are also constantly iterating new products towards the digital interface. Although the VGA interface still has application scenarios, it is generally aimed at traditional application scenarios. , the application requirements are not high, but with the user’s acceptan...

AI Technical Summary

Problems solved by technology

[0003] With the continuous development of technology in the video field, the video interface is constantly developing towards the direction of the digital interface, and chip manufacturers are also constantly iterating new products towards the digital interface. Although the VGA interface still has application scenarios, it is generally aimed at traditional application scenarios. , the application requirements are not high, but with the user’s acceptance of new technologies and cost considerations, the VGA interface is still used in the application scenario of converting analog signals to digital signals. In this way, some defects of the original VGA interface will be amplified, such as VGA signal The large jitter leads to the problem of jittery displayed images; especially with the popularization of large screens and the promotion of 4k high-definition, in order to save costs, the video is often connected to the large screen through the VGA interface, and an obvious picture will be seen on the large screen Vibration, severe cases will cause the entire screen to shake left and right, which will have an impact on the user's vision, and even cause dizziness, and the user experience is poor

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