By PURPLELEC | 29 June 2023 | 0 Comments
How to choose a VGA converter
When making TV programs, choosing a VGA converter that can convert computer VGA signals into video signals can effectively expand TV program resources and bring out better and more convenient artistic creation. So how to choose a VGA converter that meets your own TV program production requirements, here are some tips for your reference.
There are two main technical differences between computer monitors and television monitors.
1. Scanning rate: The computer scans an image on the display, 24,000 to 65,000 times per second in the horizontal direction, and 75 times per second or higher in the vertical direction. Relatively speaking, TV scanning is slow, about 15,000 times per second in the horizontal direction, and about 60 times per second in the vertical direction. The function of the scan converter is to convert the fast scan frequency computer image to the slow scan of TV technology.
2. The way computer monitors and TVs receive video signals: When the computer sends an image to the monitor, the video signal is decomposed into separate red, green, blue and synchronous modules. A TV monitor takes in a separate composite video signal. A scan converter is required to encode multiple video signals from the computer into video signals that the TV can absorb. Therefore, to convert the computer VGA signal into a video signal, it is necessary to go through scan rate conversion and encoding.
Low-end products are sometimes "software-driven", and software drivers may conflict with computer graphics processing or other applications. Also, low-end products have low-quality flare filters, if any. Generally, low-end scan converters have a lower resolution, only providing 640*480, and some new models may provide 800*600. Low-end products may receive computer signals with 6.8 million colors, but the converted images simply cannot achieve the same depth of color. Mid-range converters offer non-software features and improved flicker removal, and can offer higher resolutions. 24-bit color processing is also provided, meaning the converted image has the same depth as the original.
High-end products have higher processing power, and the resolution will reach 1600*1280, so more memory is required. These models typically use advanced de-flare algorithms for greater flexibility when receiving non-standard computer signals. Generally, high-end products can be equipped with SDI output, and can also have HD SDI output, because when the computer VGA output resolution reaches 1600*1280, what we actually see on the computer monitor is HD image.
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