HDMI has been widely used in the video industry. Whether it is in the professional audiovisual field or in home applications, HDMI has gradually become the first high-definition interface in video. The advantages of the HDMI interface over other high-definition video interfaces are self-evident. So far, HDMI has introduced the HDMI 1.4 version standard. Compared with other versions, its advantages are more obvious. Not only is the transmission rate faster, but it also supports 3840 x 21604Hz / 25Hz / 30Hz; 4096 x 2160 24Hz level ultra-high-definition image transmission, can transmit lossless audio signals, and its prospects are very broad.
However, most domestic HDMI equipment currently uses the HDMI 1.3 version or the HDMI 1.2 version, so today we mainly introduce the transmission distance of HDMI 1.3. Mayfit has also performed related tests on the issue of HDMI transmission distance. The test results are not optimistic. Using HDMI1.2 at a distance of 15 meters in the test, a high-quality HDMI cable can better complete the task of 720p or 1080i signals, but once 1080p is used, due to the high data volume, the picture transmission has started to have problems. To make matters worse, under the latest HDMI 1.3 standard, due to the increase in color depth, the amount of data is increased once again, but the problem is exacerbated again.
At present, there are many types of HDMI cables and interfaces on the market. Different cables have an impact on the transmission distance of HDMI audio and video. In the current long-distance HDMI transmission, twisted pair transmission is mostly used, and technical problems of twisted pair that are difficult to change are also encountered. In particular, problems such as signal transmission speed, impedance, capacitance, and surface effects will affect the long-distance transmission quality of the signal. The worst case is that when the HDMI standard was formulated, there was no fundamental solution to these problems. This also results in HDMI not performing as well as legendary when it comes to long-distance transmission.
Of course, if you only need short-distance transmission, within 15 meters, you do n’t need to consider HDMI video amplifier and other equipment. You only need to choose the deformation of the HDMI cable. There is basically no loss for the transmission of high-definition HDMI audio and video. However, we must pay attention to several aspects when choosing the HDMI cable.
1. The version, of course, the higher the better, which has something to do with the HDMI equipment you use. It is best to choose version 1.4, which supports 3D, and the maximum resolution is 4096 * 2160.
2. Plug: This also has an impact on the transmission of HDMI audio and video. The best choice is gold-plated 3u, followed by silver-plated, nickel-plated, etc ...
3, the choice of length: generally 18M is the longest, can be received without affecting the video signal transmission.
4. Wire diameter: Generally the market is 30AWG / 28AWG / 24AWG. The smaller the value before the AWG, the thicker the wire, the larger the current it carries, and the greater the transmission performance.
5. Shielding: If the interference in the use environment is strong, you need to consider the shielding problem. Choose 3 layers of shielding. If the distance is long, it is better to have a magnetic ring. Of course, there are some woven meshes.
6. Try to choose a brand HDMI cable as much as possible. Of course, brand HDMI cables have a better use effect than cottage HDMI cables, with a longer service life and after-sales protection.
In response to the current long-distance transmission of HDMI audio and video, Mayfit has also introduced HDMI twisted pair extenders and HDMI optical fiber extenders. The transmission distance can be from 30 meters to 500 meters, depending on the environment and distance of use. Make your selection. Of course, the HDMI optical fiber extender has better effects, stronger anti-interference and better stability than the HDM network cable extender, but the price is also more expensive.
HDMI Fiber Extender
For example, the M1803-100 series HDMI optical fiber extender is designed for high-standard and high-demand HDMI transmission. It can transmit high-definition HDMI audio and video signals over long distances, and its ability to transmit signals cannot be compared with copper cables. This optical cable extender has many advantages over ordinary HDMI optical transceivers on the market. Its total bandwidth is 6.75Gb / s and it supports HDCP. Miffy's HDMI extender M1803-100 series full optical HDMI can transmit 500 meters. It can realize the connection of long-distance high-definition player and display, which is the best product for engineering application.
HDMI cable extender
The HDMI cable extender generally has a transmission distance of 30 meters to 100 meters. The Miffy M1802-2 single network cable extender. This HDMI extender uses a CAT 5e / 6 cable to extend the HD TV display 50 meters, and it can reach 1080P. It breaks the limitation of the transmission length of the HDMI cable, it is more convenient and flexible, and the price is very high, and it is very convenient to operate.