What interface is video?

The video interface refers to the "composite video interface", which is a video interface that separates audio and video. It generally consists of three independent RCA plugs. The V interface is connected to the mixed video signal and is a yellow plug; the L interface is connected The left channel sound signal is a white jack; the R interface is connected to the right channel sound signal and is a red jack.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

What is video interface

Composite video interface (AV interface or Video interface) was once the most common video interface, used in almost all TVs and DVD players All have this interface.

It is a video interface that separates audio and video. It generally consists of three independent RCA plugs (also called plum blossom interface and RCA interface). The V interface is connected to the mixed video signal and is a yellow plug; the L interface is connected to the left The channel sound signal is a white jack; the R interface is connected to the right channel sound signal and is a red jack.

The composite video interface has two types of terminals: RCA terminals and BNC terminals. RCA terminals are commonly known as lotus heads and lotus seats, and BNC terminals are BNC heads and BNC seats. RCA terminals can be used in both composite video interfaces and audio interfaces. If used in audio interfaces, they are usually called 3.5 lotus connectors.

Composite video:

Chinese explanation: Composite video broadcast signal or composite video blanking and synchronization

Full name: Composite Video Broadcast Signal or Composite Video Blanking and Sync

Composite video, also called baseband video or RCA video, is the traditional image data transmission method of the National Television Standards Committee (NTSC) television signal. It uses analog waveforms to transmit data .

Composite Video signal is defined as a single-channel analog signal including brightness and chrominance, that is, the video signal after the audio is separated from the full TV signal. At this time, the chrominance signal is still interleaved at the high end of the luminance signal. Since the brightness and chroma of composite video are interleaved together, it is difficult to restore completely consistent colors during signal playback. This kind of signal can generally be input or output to a home video recorder through a cable. Its signal bandwidth is narrow, generally only having a resolution rate of about 240 horizontal lines. Early TVs only have antenna input ports, while newer TVs are equipped with composite video input and output terminals (Video In, Video Out), which can directly input and output demodulated video signals. Video signals no longer contain high-frequency components and are relatively simple to process. Therefore, computer video cards generally use the video input end to obtain video signals.

Category

• ##CVBS interface

CVBS is "Color, Video, Blank and Sync" , abbreviation for "Composite Video Baseband Signal", "Composite Video Burst Signal", or "Composite Video with Burst and Sync".

CVBS is a widely used standard, also called baseband video or RCA video, which is the traditional image data transmission method for National Television Systems Committee (NTSC) television signals. It uses analog waveforms to transmit data.

It is a format in which an analog television program (picture) signal is combined with a sound signal and modulated to a radio frequency carrier.

AV=AUDIO VIDEO, in fact, the VIDEO is CVBS

• RCA interface

Composite video signal (CVBS) interface , which is commonly known as the RCA interface.

RCA is the abbreviation of Radio Corporation of America, because the RCA connector was invented by this company.

RCA is commonly known as Lotus socket, also known as AV terminal, also known as AV interface. It is usually a pair of white audio interface and yellow video interface. It usually uses RCA (commonly known as Lotus head) for connection. Use You only need to connect the standard AV cable with a lotus head to the corresponding interface.

The RCA connector is by far the most common audio/video terminal. RCA audio terminals are generally color-coded in pairs: red for the right channel and black or white for the left channel. Generally speaking, RCA stereo audio cables are composed of left and right channels as a group, and each channel looks like one cable. Usually there are pairs of audio interfaces: right channel (red), left channel (white) and video interface (yellow)

Composite video (Composite) usually uses yellow RCA (Lotus socket) connectors. "Composite" means an analog signal that transmits brightness and chrominance signals in the same channel. However, if the TV cannot separate these two signals well, ghosting will occur. Audio interfaces and video interfaces are used in pairs. They are usually white audio interfaces and yellow video interfaces. They are connected using RCA (lotus head). When using, you only need to connect the standard AV cable with lotus head to the corresponding interface. Yes (but some require software support).

• AV interface

The composite video interface is also called AV interface or Video interface. It is the most common video interface at present. Almost all TVs and DVD players all have this interface.

AV composite (Composite) video interface is an analog interface. It is a video interface that separates audio and video. It is generally composed of three independent RCA plugs (also called plum blossom interface and RCA interface) in yellow, white and red. , where the V interface is connected to the mixed video signal and is a yellow jack; the L interface is connected to the left channel sound signal and is a white jack; the R interface is connected to the right channel sound signal and is a red jack

Since the video signal is no longer Contains audio, so generally audio input and output ports (Audio In, Audio Out) are matched with the video input and output ports to facilitate simultaneous transmission of audio. Therefore, sometimes the composite video interface is also called AV (Audio Video) interface.

The AV interface realizes the separate transmission of audio and video, which avoids the degradation of image quality caused by audio/video mixing interference, but because the AV interface still transmits a brightness/chrominance (Y /C) Mixed video signals require brightness/color separation and chroma decoding to achieve imaging. Mixing first and then separating will inevitably cause signal loss or distortion, and chroma and luminance signals will also be distorted. There is a huge chance of interfering with each other. Due to the technical flaws inherent in the brightness/chrominance (Y/C) mixed video signal processing method, the application of AV video interfaces is greatly limited.

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