A kind of composite video signal generation method

A technology for composite video signal and generation method, which is applied in television, color TV, image communication, etc., can solve the problems of high difficulty in use and complicated generation process of composite video signal, and achieve simple realization, easy implementation, and meeting the requirements of time accuracy Effect

Active Publication Date: 2018-01-09
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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Problems solved by technology

[0003] The purpose of the present invention is to provide a composite video signal generation method, to solve the complex video signal generation process and difficult to use the problem

Method used

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  • A kind of composite video signal generation method
  • A kind of composite video signal generation method
  • A kind of composite video signal generation method

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Embodiment Construction

[0015] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0016] The functional modules of the composite video signal generation process adopted by the present invention are as figure 1 As shown, it includes FPGA, synchronization separation unit, digital-to-analog conversion unit, operational amplifier unit and external fixed clock. After the composite video signal is separated by the synchronization separation unit, a synchronization signal is generated and input to the input terminal of FPGA. FPGA is based on the external fixed clock and synchronization signal. Generate a conversion clock, and use the generated conversion clock as the dot clock of the digital-to-analog conversion unit, and the digital-to-analog conversion unit performs digital-to-analog conversion on the composite video signal according to the generated dot clock to generate an analog signal, and pass the generated analog signal t...

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Abstract

The invention relates to a method for generating a composite video signal, belonging to the technical field of electronic design. According to the corresponding output synchronization level data and blanking level data of the synchronization signal, the present invention makes the D / A output the corresponding level data at the same time, in the video signal period, the starting point of the video signal period is determined, and the video data and Convert the clock for D / A output video signal. The composite video signal generated by the invention is in a synchronous state with the input composite synchronizing signal, which satisfies the requirement of time precision, and the whole generating process is simple to realize, and the hardware design is simple and easy to implement.

Description

technical field [0001] The invention relates to a composite video signal generation method, which belongs to the technical field of electronic design. Background technique [0002] Currently, a common solution for generating composite video signals is to use a video encoder chip. The encoder is powerful, with master and slave modes, which can accept external dot clocks or work independently with its own clock. However, the use of the encoder is difficult, and serial communication must be used for parameter configuration after power-on, which increases the burden on the designer. In the case that the system already has a dot clock, D / A can also be used to generate video analog signals, and then superimposed with synchronous signals through high-speed analog switches to generate all composite video signals. During the design, the voltage amplitude of the two parts should be precisely controlled to ensure the proportional relationship of 3:7. This scheme is more complicated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/04H04N5/14
Inventor 郑鑫
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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