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IX
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frequently asked questions
Q1：DVI、HDMI、VGA、CV、USB Port definition.
A：
DVI
：
Digital (HD) video signal is an interface standard introduced by DDWG (Digital Display
Working Group) in 1999 by Silicon Image, Intel and other companies. It has been well
optimized in speed, clarity and HDCP protocol. Signal sources are typically desktop
computers, notebooks, etc.
HDMI
：
High Definition Multimedia Interface (HDMI) is a digital video/audio interface
technology. It is a special digital interface suitable for image transmission. It can transmit
audio and video signals at the same time. The maximum data transmission speed is 5 Gbps.
Signal sources are usually cameras, notebooks, information dissemination systems, etc.
VGA
：
Analog Video Signal (Video Graphics Array) is a video transmission standard developed
by IBM with PS/2 in 1987. It has many advantages, such as high resolution, fast display
speed and rich color. It has been widely used in the field of color display. Signal sources are
typically desktop computers, notebooks, song machines, matrices, etc.
CV
：
Composite video signal, also known as composite video signal, is a signal that packages all
signals into a whole for transmission. Signal source is usually camera, DVD, TV box,
song-ordering machine, video matrix and other equipment.
USB
：
Universal Serial Bus (USB), an external bus standard, is used to standardize the connection
and communication between computers and external devices. It is an interface technology
applied in the field of PC. USB was proposed jointly by Intel, Compaq, IBM, Microsoft and
other companies in 1994. Signal source is usually U disk, SD card, etc.
Q2：Briefly describes the connection mode of video card, video processor, receiving
card and large LED screen.
A:
The video card's DVI (VGA) output port is connected to the DVI-IN (VGA-IN) input of the
video processor. The output of the video processor's network port is connected to the terminal
receiving card behind the screen through the network cable. The receiving card connects and
