There are significant differences between VGA cables and AV cables in many aspects, mainly including the following aspects:
1. Definition and use
VGA cable: VGA (Video Graphics Array) cable is a video transmission cable used to connect computers and monitors. It can transmit image signals from the computer to the monitor. VGA cable is an analog signal transmission cable with high resolution and color depth, and is widely used in computers, projectors and other fields.
AV cable: AV cable is a general term for audio cables and video cables in home audio, which are used to connect media playback devices and display devices, such as DVD players, HTPCs, etc. AV cables are divided into audio interfaces and video interfaces, which transmit left and right channel sound signals and mixed video signals respectively.
2. Interface and connection
VGA interface: There are 15 pins on the VGA interface, divided into three rows, five in each row. Among them, 3 pins are used to transmit the red, green and blue primary color signals, and the other two pins are used to transmit horizontal and vertical synchronization signals. The VGA interface is the most widely used interface type on graphics cards, and most graphics cards have this interface.
AV interface: AV interface is also called RCA interface, which is divided into audio interface and video interface. The audio interface is red and white lines, which connect the left and right channel sound signals respectively; the video interface is yellow line, which connects the mixed video signal. AV interface is widely used in TV and DVD connection, and is one of the necessary interfaces for every TV.
3. Signal type and transmission
VGA signal: VGA signal contains five types of R/G/B/H/V, which are three primary colors and line field synchronization signals. Although VGA cable contains 15 wires, only 5 wires are actually used to transmit image signals. VGA signal is an analog signal. For the display image information generated digitally, it needs to be converted into R, G, B three primary color signals and line and field synchronization signals through a digital/analog converter, and then transmitted to the display device through a cable.
AV signal: AV signal is a mixed transmission of analog video signal and audio signal. Video signal is a mixed signal of brightness and chrominance, which needs to be separated in brightness and color on the display device and decoded to form an image. Audio signal is a stereo signal of left and right channels.
4. Features and limitations
VGA cable:
- Advantages: high quality of transmitted image signals, good resolution and color depth.
- Disadvantages: limited transmission distance, serious signal attenuation and crosstalk problems during long-distance transmission. At the same time, VGA cables are difficult to wire and easy to break.
AV cable:
- Advantages: simple interface, convenient connection, widely used in home audio and TV and other devices.
- Disadvantages: Since AV signals are mixed video signals, the image quality is relatively poor and is easily affected by external electromagnetic interference. In addition, AV cables will also have a certain attenuation when transmitting long-distance signals.
5. Application scenarios
VGA cable: more suitable for connecting computers with monitors, projectors and other devices, especially in situations where high resolution and color depth are required.
AV cable: more suitable for connecting between home audio, TV and other devices, especially in situations where audio and video signals need to be transmitted simultaneously.
In summary, there are obvious differences between VGA cables and AV cables in terms of definition, interface, signal type, characteristics and application scenarios. When choosing to use, you need to choose the appropriate cable according to specific needs and scenarios.