Nowadays, people not only pay attention to work, but also pay attention to leisure in their spare time. For example, buy some electrical appliances that can watch videos or listen to music, such as mp3, mp4, video cameras and video recorders, etc., which can help us relax ourselves. When I mentioned the hdmi interface, I don't know if you have heard of it. In fact, hdmi is based on audio and video. Sometimes we need to connect to the interface when listening to music or watching videos. Many interfaces use hdmi. Interface, then there are several kinds of hdmi interface?

First, the analog video interface.

1. The simplest and most primitive video interface is the composite video signal (CVBS) interface, also known as the RCA interface.

2. Since the composite video signal combines the luminance signal and the chrominance signal by a spectral interleaving method, the problem of bright color crosstalk and reduced definition is caused. Therefore, with the development of cameras and S-VHS recorders, the S-terminal interface has emerged. The luminance signal Y and the chrominance signal C are separately transmitted. Make sure that the luminance signal is not disturbed by the chrominance signal.

3. Although the S terminal is used to transmit the current video signal, it is very good, but the real AV player is still not satisfied. The chrominance signal is obtained by modulating the color difference signal on a color load wave. Why not directly transmit the color difference signal? Therefore, the electrical appliance manufacturer develops its own video interface according to its own situation. European manufacturers unify, using the SCART interface, the transmission of RGB three primary color signals. Now SCART has become the standard interface for European appliances, and Japan's high-end DVD players and TVs have D terminals. The Americans continue the tradition of using RCA terminals, using three RCA terminals to transmit color difference components.

Second, the digital signal interface.

1, USB is now more and more widely used, mouse, keyboard, mobile flash card, etc., suitable for low-speed signal transmission. Therefore, USB is only suitable for transmitting still images such as JPG photos of digital cameras or low-quality moving images, and is not suitable for transmitting dynamic high-definition images.

2, IEEE1394 is also called i.Link, because it is widely used in digital cameras, it is also called DV interface. The highest data rate transmitted is 400MBPS. Due to speed limitations, only interlaced and MPEG-compressed signals can be transmitted while transmitting video signals. Although most people are not aware of the image quality loss caused by MPEG compression, of course, no compression is the best. IEEE 1394 is also not suitable for transmitting high definition video signals.

Third, DVI interface

With a transfer speed of up to approximately 8GBPS (165MHZ x 24bit x 2), it is suitable for transmitting uncompressed, high definition video signals. Supports up to QXGA (2048x1536) format. Many graphics cards now have DVI output. DVI is the standard input interface for plasma displays today. Some of the high-definition analog TVs sold in the US also have a DVI interface, but the name is DVI-HDTV, which is actually the standard DVI interface.

Through the above content, I believe that everyone has already made it clear that many people may not understand these contents at ordinary times, but the hdmi interface is an interface commonly used in our life. I hope everyone can learn more about it, maybe in the future. One day we will use this knowledge, because the current era is developing very fast and has entered the information age, so we should have a lot of knowledge about this information so that we can better adapt to society. Not eliminated by society.