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What is the difference between RCA interface and AV interface?

Update:09 Jul 2020

RCA is the English abbreviation for the Lotus socket. It is not designed for which interface. It can be used for audio and ordinary video signals. It is also a DVD component (YCrCb) socket, but the number is three.
The RCA terminal uses a coaxial transmission method, the central axis is used to transmit the signal, and the contact layer on the outer edge is used for grounding, which can be used to transmit digital audio signals and analog video signals. RCA audio terminals are generally marked in different colors in pairs: the right channel is red (or the letter "R" means "right"); the left channel is black or white. Sometimes, the center and surround channel cables will be marked with other colors to facilitate the distinction when wiring, but all the RCA connectors in the entire system are the same in electrical performance. Generally speaking, the RCA stereo audio cable is a group of left and right channels, and each channel is a line in appearance.
RCA interface style: usually a pair of audio interface (left and right channels) (white) and video interface (yellow)
RCA interface connection mode: It usually uses RCA (commonly known as lotus head) for connection. When using, it only needs to connect the standard AV cable with lotus head to the corresponding interface.
Advantages of RCA interface: AV interface realizes the separate transmission of audio and video, which avoids the degradation of image quality caused by mixed audio/video interference. At present, the most widely used interface on TV equipment, almost every TV provides this interface for video input.
Disadvantages of the RCA interface: Since the AV interface still transmits a mixed luminance/chrominance (Y/C) video signal, the display device still needs to perform bright/color separation and chromaticity decoding to image it. The separation process will inevitably cause the loss of color signals, and the chrominance signal and the brightness signal will also have a great chance of interfering with each other, thereby affecting the final output image quality. AV also has a certain vitality, but because of its insurmountable shortcomings of Y/C mixing, it cannot be used in some occasions that pursue visual limits.

The AV interface is also known as (RCARCA), which refers to some current car GPS devices, which are connected to AV lines through their own audio and video terminals to output their own data, images, sounds, etc. to other display and audio-visual equipment, such as external displays or headphones. The interface mainly includes AV composite terminal, S-VIDEO terminal, headphone jack, etc. It can be regarded as an improved interface for TV, with a very different appearance. Divided into 3 lines, namely: audio interface (red and white lines, composed of left and right channels) and video interface (yellow).
Since the AV output is still a video signal that mixes brightness and chrominance, the display device still needs to separate brightness and color, and decode to be able to image. This approach will inevitably cause a loss of image quality, so the image quality of the AV interface is still not satisfactory. The connection is very simple, just connect the AV cable of 3 colors to the interface of 3 colors on the TV side.
In general, the AV interface realizes the separate transmission of audio and video, and can avoid the image quality degradation caused by the mutual interference of audio and video in imaging. The AV interface is widely used in the connection between TV and DVD, and is one of the necessary interfaces for each TV.