By PURPLELEC | 15 July 2024 | 0 Comments
Introduction to Common Interfaces of HD Capture Cards: HDMI, DVI, and VGA
In the high-definition equipment in the video industry, the main interfaces are video interfaces such as DVI, HDMI, and VGA, which are also the most commonly used interfaces in the industry. Among them, VGA transmits ana-log video signals, DVI is a digital interface, and HDMI can transmit video signals and audio signals at the same time.
The transmission signal of the DVI interface adopts a fully digital format, which corresponds to the VGA interface that uses analog signals. The difference between VGA and DVI is that the transmission of VGA analog signals is more troublesome. First, the digital signal in the computer is converted into an analog signal, and the signal is sent to the LCD display, and the display then converts the analog signal into a digital signal to form a picture displayed in front of everyone. Because of this, the signal loss in the middle is serious. Although some pictures can be repaired by software methods, the picture will be more blurred as the resolution of the display increases. Generally, analog signals will have obvious errors when the resolution exceeds 1280×1024, and the higher the resolution, the more serious it is.
VGA (Video Graphics Array) interface, also called D-Sub interface. Although LCD monitors can directly receive digital signals, many low-end products use VGA interfaces in order to match VGA interface graphics cards. VGA interface is the most widely used interface type on graphics cards, and most graphics cards have this interface.
HDMI (High-Definition Multimedia Interface), often called high-definition multimedia interface, is a new interface that ends the previous audio and video separation transmission; its maximum transmission speed can reach 5Gb/s, in addition to image data, it can also transmit up to 8 channels of audio signals at the same time; uncompressed digital data transmission can effectively reduce signal interference and attenuation caused by digital/analog conversion. HDMI is the first digital interface that supports transmission of uncompressed all-digital high-definition, multi-channel audio and intelligent format and control command data on a single cable.
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