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Switching device and switching method of asynchronous videos

A technology of video switching and switching devices, which is applied in the direction of TV, electrical components, image communication, etc., and can solve problems such as jumping, image splitting of monitors, and visual impact on users

Inactive Publication Date: 2011-05-25
TIANJIN TIANDY DIGITAL TECH
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Problems solved by technology

[0008] Most surveillance video switching products in the prior art do not support synchronous switching of asynchronous videos. If the video signal is cut off in the middle of scanning a certain field, another asynchronous video signal is introduced at the same time, that is, when switching between different video When the source video is used, due to the asynchrony of the line and field signals of different video sources, it will cause a large switching interference when switching, causing the monitor image to split and jump, and then enter a steady state, which will give users Bring a certain visual impact

Method used

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  • Switching device and switching method of asynchronous videos

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the drawings and examples.

[0033] figure 1 is a schematic diagram of a video signal of a line period; figure 2 is a schematic diagram of the black field video signal during the switching process; image 3 It is a switching sequence diagram in the switching method of asynchronous video of the present invention; Figure 4 It is a signal flow diagram of the asynchronous video switching method of the present invention.

[0034] like Figure 1 to Figure 4 As shown, the monitor will start scanning another line of signals after each scan of a line of signals. Taking the PAL system as an example, after scanning 625 lines, that is, after 1 frame, the monitor starts to scan the video signal of the next field. If in the middle of scanning a certain field, the video signal is cut off, and another asynchronous video signal is introduced at the same time, the resulting phenomenon is that a large video s...

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Abstract

The invention discloses a switching device and a switching method of asynchronous videos. A video signal acquisition module is connected with each video source to be switched, recognizes the system of each video and acquires line field signals of multiple paths of asynchronous videos respectively; a black video signal generating module generates a black video signal and inputs the black video signal to a video switching module; and a black video line field signal adjusting module adjusts the line field period of the black video signal according to different line field periods of the video sources, performs signal synchronization on each black video signal and a corresponding video source, generates a black burst by using the black video signal generating module during video switching and changes the system and the line field period in a black period, so that image splitting and hopping during switching are eliminated.

Description

technical field [0001] The present invention relates to the technical field of video monitoring, specifically a black field video signal generating module is used to generate a black field signal during video switching, and the system and line field cycle are changed during the black field period, thereby eliminating image splitting and jumping during switching. A switching device and switching method for variable asynchronous video. Background technique [0002] Currently, there are four current color TV systems in the world: NTSC, PAL, SECAM, and HDTV. Here is an overview of the two main video formats: NTSC and PAL. The NTSC color television system is a color television broadcasting standard defined by the National Television Standards Committee of the United States in 1952. It is called a quadrature balanced amplitude modulation system. However, because the NTSC system has the disadvantage of phase sensitivity that causes color distortion, Germany and 1962 formulated the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/084
Inventor 戴林刘金鹏
Owner TIANJIN TIANDY DIGITAL TECH
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