Video character superposing circuit and electronic device

A technology of character superposition and character level, applied in TV, electrical components, color TV, etc., can solve problems such as leakage chips, hidden safety hazards, and complex circuit structure.

Active Publication Date: 2015-12-30
HEBEI SHANGYUAN IND CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a video character superimposition circuit, which solves the complicated circuit structure in the prior art due to the need to combine diff

Method used

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  • Video character superposing circuit and electronic device
  • Video character superposing circuit and electronic device
  • Video character superposing circuit and electronic device

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Please refer to figure 2 , the present embodiment adopts a serial character superposition circuit, specifically comprising a line and field synchronous separation circuit, the input end of the line and field synchronous separation circuit is connected to the original video signal, and the output end of the line and field synchronous separation circuit is connected with a character superposition circuit, and the character superposition circuit The output end of the high-speed analog switch is connected with a high-speed analog switch. The high-speed analog switch adopts 4 high-speed analog switches, one of which is connected to the original video signal, and the other is used as the output end of the original video signal. A black character level generator, and the white character level generator and the black character level generator are connected with a level conditioning circuit for filtering and other processing of the levels of the white character level generator a...

Embodiment 2

[0031] Please refer to image 3 , the present embodiment adopts parallel character superposition circuit, specifically comprises line and field synchronous separation circuit, and the input terminal of line and field synchronous separation circuit is connected with original video signal, and the output end of line and field synchronous separation circuit is connected with character superposition circuit, and character superposition circuit The output end of the high-speed analog switch is connected with a high-speed analog switch. The high-speed analog switch adopts 4 high-speed analog switches, two of which are connected to the original video signal, and one of the other two is connected to the white character level generator, and the other is connected to the black character level generator. The white character level generator and the black character generator are connected with a level conditioning circuit, which is used to filter the level, and the character superposition c...

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Abstract

The invention brings forward a video character superposing circuit. The video character superposing circuit comprises a line-field synchronous separation circuit. Original video signals are accessed to the input end of the line-field synchronous separation circuit, the output end of the line-field synchronous separation circuit is connected with a character superposing circuit, the output end of the character superposing circuit is connected with a switch circuit, the output end of the switch circuit is connected with a character level generator, and the original video signals are also accessed to the switch circuit. According to the invention, the following problems are solved: the switching effect between the original video signals and character level in the prior art is not ideal. Firstly, since the circuit is realized through combining different components, the circuit structure is quite complex as a result; and secondly, the problem of safety hidden trouble exists due to chip breakdown caused by an electric leakage phenomenon possibly resulted from signal switching.

Description

technical field [0001] The invention belongs to the technical field of video signal processing, in particular to a video character superposition 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, at present, the switching effect between the original video signal and the character level is no...

Claims

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Application Information

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IPC IPC(8): H04N5/445
Inventor 冯凤江
Owner HEBEI SHANGYUAN IND CONTROL
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