SDI digital switching system with functions of video effect switch and mute switch

Abstract

The invention relates to an SDI digital switching system with functions of video effect switch and mute switch. The system comprises a main board, a back board and a control panel. An FPGA processing and image storage unit of the main board adopts a high-speed image storage chip and a high-speed large-capacity FGPA chip so that the switching system has the frame synchronizing function and ensures the stability of signals during effect switch; and video signals are subjected to effect switch and mute switch of various formats such as fade-in fade-out and the like, the prior direct switching mode is improved, the impact brought by images and sound before and after switching the signals is effectively avoided, and the vision and the audition of a user are protected. The back board part is provided with an analog video preview output interface and an analog audio preview terminal, so the user can watch and listen to the played signal contents to be switched in advance, and the reliability and safety of play are improved.

Description

technical field [0001] The invention belongs to the technical field of video and audio in the field of electronic information, in particular to the technical field of video and audio switching. Background technique [0002] At present, there are several common methods for signal switching: 1) direct switching; 2) black screen first and then switching; 3) first static picture and then switching. When switching the signal directly, the user will see an unstable image state, affecting the viewing effect. The method of first blacking out and then switching often brings greater visual contrast and impact, and there is no amount of information in the black screen, which affects the viewing effect to a certain extent. Compared with the above two methods, the method of stilling the screen first and then switching has made some progress. This method is to freeze the last frame of image before switching, and then switch the image content. It will cause discomfort to the human eye, a...

AI Technical Summary

Problems solved by technology

When switching the signal directly, the user will see an unstable image state, affecting the viewing effect

The method of first blacking out and then switching often brings greater visual contrast and impact, and there is no amount of information in the black screen, which affects the viewing effect to a certain extent

Compared with the above two methods, the method of stilling the screen first and then switching has made some progress. This method is to freeze the last frame of image before switching, and then switch the image content. It will cause discomfort to the human eye, and because the definition of the dynamic image is very limited after it is still, the actual viewing effect is not good

Moreover, the above three methods do not consider the possible auditory impact caused by the image and sound after switching the signal. If the image and sound are low before the signal is switched and the sound is high after the switch, it will bring a greater sound impact and produce a broken sound. Phenomena that affect the viewing effect

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