Nowadays, with the upgrading of high-definition devices, LCD TVs, Blu-ray DVDs, high-definition projectors and other devices are equipped with HDMI interfaces. It is well known that in the past, more cables were needed to connect devices, and the arrangement and arrangement were also troublesome. Through an HDMI high-definition line can achieve simultaneous transmission of images and sound, the connection is convenient, the picture quality is more clear and full, the sound is more real and natural. What should you pay attention to when installing the HDMI cable? The following article is for everyone.
What is the use of HDMI cable
1, set-top box and smart TV use
When we purchased a set-top box or box, we randomly matched an HDMI high-definition cable to connect the box to the TV.
2, computer use
The HDMI HD cable acts as a signal transmission line for smart TVs and computers to transfer the contents of the computer to the smart TV via the HDMI cable.
The advantage of applying HDMI is that only one HDMI cable is needed to transmit audio and video signals at the same time, unlike the need for multiple wires to connect; at the same time, higher audio frequencies can be achieved due to wireless digital/analog or analog/digital conversion. And video transmission quality. For consumers, HDMI technology not only provides clear picture quality, but also simplifies the installation of home theater systems because audio/video uses the same cable.
Projector HDMI Interface Connection Precautions
1, HDMI can not hot plug
One of the greatest advantages of the HDMI interface is its ease of use, as long as one line, audio and video can be all transmitted. And the interface design is very easy to pull and plug, you can easily plug in and pull out without pressing any button. However, this brings another problem. If you plug in or unplug it directly, it will easily cause the HDMI chip to be destroyed. Therefore, when plugging in or plugging in an HDMI cable, do not hot-plug it. The projector and related connected devices must be turned off before they can be removed.
2, short-distance transmission with a cheap HDMI cable can
For many of our home users, projectors and other devices that provide input sources will not be too far away, generally one to two meters, so we generally choose 1.5 meters of HDMI cable on it. In the HDMI cable selection, 5 meters or less can be considered short-distance transmission, HDMI cable selection is relatively simple, an important factor affecting the quality of wire is the thickness of the wire, can be divided into 24,26,28 and 30 several The smaller the number is, the thicker the wire diameter is and the better the effect is. For lines less than 5 meters, choose lines 28 and 30, 1.5 meters no more than 80 yuan, and 5 meters no more than 150 yuan.
3, long distance transmission has strict requirements on the wire
If it is a long distance transmission, the requirements for HDMI cables are very strict. The factors that determine the quality of HDMI cables, in addition to the thickness of the wire, are as follows:
(1) Selection of raw materials. Good wire, core wire is silver plated, and low-cost cable is tin plated.
(2) Production process. The low-grade production equipment used for manufacturing wire rods is as low as 100,000 yuan and upscale equipment is as high as 16 million yuan. The quality of the wire rods produced is also a great disparity.
(3) Shielding effect. The HDMI cable produced by the low-end equipment has a shielding effect of only 80% to 85%, while the high-grade cable shielding efficiency reaches 95%.
Long-distance transmission, in the transmission of 1080i or 720P signal, the difference is not, but the transmission of 1080P signal, the wire is very demanding, if the quality of the line but off, there is a screen jump, large erythema phenomenon, no signal is heavy .
Therefore, the choice of long-distance lines should be very cautious. When you choose, you can't just look at the outer thickness of the line. Many lines that look very thick are just thick skins. They are actually line 28 and can't transmit 1080P signals at all. The 1080P signal is transmitted over 10 meters of HDMI cable. The best requirement is the 24 line, and at least line 26 is also guaranteed. Line 24 transmits 1080P signals and can reach 45 meters. And the 28th line transmits 1080P signal, even if it is 10 meters away, it can not guarantee the quality.
4, HDMI cabling carefully embedded in the wall
A lot of friends want to use the esthetic and convenient in the future and want to bury the HDMI cable in the wall beforehand in the decoration. This must be done with care. If you want to make it clear that if the pre-embedded wires are lines 28 and 30, there will be problems in transmitting 1080P programs and there will be endless troubles. At present, most people still lack the true 1080P signal and cannot test the quality of the wire. When the real signal comes later, it will be too late.
Smart TV/box information can focus on smart TV information network sofa butler (http://), China's influential TV box and smart TV website, providing information, communication, TV boxes, smart TVs, smart TV software, etc. Answering questions.
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