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Method removing video graphics array (VGA) signal vibration based on optical fiber transmission

An optical fiber transmission and signal technology, applied in the field of video and audio, can solve problems such as affecting image quality, black screen, terminal jitter, etc., and achieve the effect of ensuring image quality

Inactive Publication Date: 2013-04-24
大连科迪视频技术有限公司
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Problems solved by technology

[0004] The existing technology has the following defects: After the video signal is remotely transmitted through the optical fiber, the clock signal CLK1 with jitter is used as the clock to output the parallel video signal, which will cause obvious jitter and black screen at the terminal, which affects the image quality

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  • Method removing video graphics array (VGA) signal vibration based on optical fiber transmission
  • Method removing video graphics array (VGA) signal vibration based on optical fiber transmission
  • Method removing video graphics array (VGA) signal vibration based on optical fiber transmission

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Embodiment Construction

[0023] The present invention provides a method for eliminating jitter of a VGA signal based on optical fiber transmission, and the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] When the VGA signal is transmitted over a long-distance optical fiber, the analog video signal is first converted into a digital signal through an A / D converter and a decoder, and then the digital video signal is converted into an optical signal in the electrical / optical transmission module. The electrical / optical transmission module uses the input analog video clock as the reference clock to encode and convert the parallel video signal, and after the clock frequency is multiplied, it is converted into a serial differential signal for transmission through the optical fiber. This processing will greatly increase the transmission frequency. When the optical / electrical conversion module receives the optical signal, it co...

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Abstract

The invention discloses a method removing video graphics array (VGA) signal vibration based on optical fiber transmission. The method includes the steps: using a clock (CLK) 1 with vibration to be as a clock, enabling a video signal through the optical fiber transmission to be stored in a first-in-first-out (FIFO) of a field programmable gate array (FPGA), using a clock (CLK) 2 which is in the same with the CLK1 in frequency and has no vibration to be as an output clock, and enabling the video signal which is stored in the FIFO to be output. The method has the advantages of being capable of rectifying to image vibration and black screen after an analog video signal is in teletransmission and guaranteeing image quality.

Description

technical field [0001] The invention relates to the technical field of video and audio, and more specifically relates to a method for eliminating jitter of a VGA signal based on optical fiber transmission. Background technique [0002] With the continuous development of technology in the video field, the development and application of digital signals have reached the level of keeping pace with analog signals. In the process of transmission, digital signals have the advantages of strong confidentiality, good consistency, small signal distortion (including no crosstalk and intermodulation), no attenuation regeneration and the potential to expand uncertain signals to original baseband signals. Therefore, in long-distance transmission occasions, the application of digital signals has gone far beyond analog signals. However, according to the analysis of China's current actual situation, analog signals will occupy a large application market at present and in the future. Therefor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/22
Inventor 周潮义周春雷张坛
Owner 大连科迪视频技术有限公司
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