Video character superposition circuit and electronic device

Abstract

The invention provides a video character superposition circuit. The video character superposition circuit comprises a row and field synchronization separation circuit; a video signal is input into the input end of the row and field synchronization separation circuit; the output end of the row and field synchronization separation circuit is connected with a character superposition circuit; the output end of the character superposition circuit is connected with a logic circuit; the output end of the logic circuit is connected with a level conditioning circuit; the output end of the level conditioning circuit is further used for connection with the video signal; the output end of the level conditioning circuit serves as a circuit output end. The video character superposition circuit is used for solving the problems of the video character superposition circuit in the prior art, namely insufficient stability due to easy damage of the circuit, frequent breakdown due to electric leakage issues of a video cable, and high cost.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a video character superimposition circuit and electronic equipment. Background technique [0002] Relying on the development of chip technology and the characteristics of high-fidelity and low-latency, video transmission systems are becoming more and more popular and applied. In the process of video transmission, the demand for character superimposition on video has also become very urgent. When superimposing characters, generally white or other fixed colors are used to indicate the color of the characters, and then the required characters are superimposed on the video. The character overlay circuit for video signals is relatively mature, and video overlay chips of various grades are very common in the market. Quickly switch between character levels. [0003] However, traditional superimposition circuits generally use high-speed analog switches for video switching, s...

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a video character superimposition circuit and electronic equipment, which solves the problems in the prior art that the video character superposition circuit is easily damaged, which leads to instability, often causes breakdown due to leakage problems on the video cable, and high cost.

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