The role of the character adder is simply to superimpose the character information into the video signal, which can be seen on the monitor screen or stored in the hard disk recorder. The following describes the role of the character adder.
Character adder function
To understand the role of the character adder, we must first introduce what the character stacker is. The character adder is abbreviated as VDM and is an abbreviation of English Video Display Metafile. It refers to superimposing all kinds of subtitle information that humans can easily recognize on the composite video signal, and displaying the character information together with the content in the original composite video signal on the electronic processing of the video display device (such as a monitor, a hard disk recorder, etc.) Device. More through the OSD implementation. OSD is an abbreviation of English On Screen Display, also known as character generator. The function is: generate some special glyphs or graphics on the screen of the display, so that the user can get some message prompts.
Character adders can be divided into dynamic character overlays and static character overlays.
The function of the dynamic character adder is that the character adder cooperates with the microcomputer or other equipment to receive and process the data information that changes with the scene conditions, and combines this information with the live video signal to provide more detailed and accurate information for the monitor.
The function of the static character adder is to display relatively fixed form character information on the video signal without receiving external data.
According to the function of the character superimposer, it can be applied to many occasions. Therefore, there are many types of character superimposers, such as: money counter character superimposer, elevator floor character superimposer, charging system character superimposer, public place information release superimposer, Temperature and humidity character stacker, matrix character stacker, cash register character stacker, oil well depth character stacker.
Different types of character adders are used differently, but these character adders work the same.
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