Method and device for eliminating jitter of VGA signal

Abstract

The present application discloses a method and device for eliminating VGA signal jitter, the device comprising: a first clock buffer, a clock phase-locked loop module, a NOT gate and a flip-flop, the first clock buffer and a clock phase-locked loop module and a trigger The clock phase-locked loop module is connected to the NOT gate, and the NOT gate is connected to the flip-flop; the first clock buffer is used to obtain the HS signal in the VGA signal, expand the HS signal into two channels and send it to the clock phase-locked loop module and Trigger; the clock phase-locked loop module is used to generate the first clock signal synchronized with the HS signal according to the HS signal, and send the first clock signal to the NOT gate; the NOT gate is used to reverse the phase of the first clock signal by 180 degrees, The second clock signal after the inversion is sent to the flip-flop; the flip-flop is used to sample the HS signal according to the second clock signal to generate a jitter-eliminated HS signal; the application can eliminate the jitter of the HS signal in the VGA signal, and improve user experience.

Description

technical field [0001] The present application relates to the field of video technology, and in particular, to a method and device for eliminating video graphics array (Video Graphics Array, VGA) signal jitter. Background technique [0002] VGA interface is the most widely used interface type on graphics cards. It is used to decompose video signals into three primary color signals (red R, green G, blue B), vertical synchronization (VSYNC, VS) signals and horizontal synchronization (HSYNC, HS) signals. to transmit. [0003] With the continuous development of technology in the video field, video interfaces continue to develop in the direction of digital interfaces, and chip manufacturers continue to iterate new products towards digital interfaces. Although VGA interfaces are still used in scenarios, they are generally aimed at traditional application scenarios. , the application requirements are not high, but with the user's acceptance of new technologies and cost considerati...

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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