The basic interface for RCA socket audio and video connection

RCA sockets play a crucial role in home theaters, audio systems, and even professional audio and video equipment. A small interface labeled with red, white, yellow, and other colors plays a crucial role - it is the RCA socket (also known as a lotus socket or AV terminal). As one of the most widely used audio and video analog signal transmission interfaces, RCA sockets continue to serve our audiovisual life with their simple connection method.

Core function: Transmission of analog signals

The core function of RCA sockets is to transmit analog audio and video signals. It usually appears in groups, with each interface responsible for transmitting an independent signal.

Audio transmission:

White interface: typically used for transmitting left channel stereo audio signals.
Red interface: typically used for transmitting right channel stereo audio signals.
Basic stereo audio connection can be achieved through the red and white lines.

Video transmission (composite video):

Yellow interface: This is the most common identifier used specifically for transmitting composite video signals. It mixes the brightness, chromaticity, and synchronization signals of the video in one cable for transmission.
(Note: Some professional or old-fashioned devices may have RCA interfaces in other colors for component video signals (such as green, blue, red), but yellow represents the most basic composite video).

Main purpose: Connect audio and video devices

With its simple and easy-to-use features (simply insert it with the color aligned), RCA sockets are widely used to connect various consumer electronic devices, such as:
Connecting audio sources to amplifiers/speakers: such as connecting audio outputs from CD/DVD players, game consoles, set-top boxes, etc. to amplifiers or active speakers.
Connecting video sources and display devices: such as connecting the composite video output of old DVD players, recorders, game consoles, etc. to the corresponding input of a TV or monitor.
Connecting subwoofer: In home theater systems, a single RCA cable (usually white or red) is commonly used to connect the subwoofer output of AV amplifiers to an active subwoofer.
Transmission of line level signals between professional audio equipment.