"DIY old driver series" is now in the fifteenth period. In this issue, we continued the content of the twelfth issue and talked about how HDMI cables should be selected. The old drivers must drive cars again! Please grasp the armrests and orderly get on the train.
[PConline Talk] When using high-definition playback platforms or even 4K high-definition playback platforms, we can't avoid meeting the need to select and purchase HDMI cables. At this time, some small partners will ask, how to choose HDMI cables will appear What about the old driver? No hurry, next we will tell you from several aspects, how to choose a good HDMI line.
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First determine the HDMI interface version
The open black version is 1.4 and 1.3, and the blue version is 2.0.
In the twelfth period, we once said that the HDMI interface is different, and the bandwidth and supporting technologies are also different. The HDMI cable is also divided into 1.3 to 2.0 versions as well as the HDMI interface in the market, and maintains downward compatibility. The HDMI cable must be compatible with the HDMI interface version. At least the cable version should be higher than the interface version. If the version of the optional cable is lower than the interface, the HDMI2.0 interface with a HDMI1.4 cable, is unable to transmit 4K@60hz video, but if you give HDMI1.4 interface with a HDMI2.0 wire, There is no problem in using it. It just costs more money because the high version of the HDMI cable will definitely be slightly more expensive.
Look at the wire there is no certification mark
HDMI authentication
Sinplay authentication
Check whether there is a HDMI or Simplay certification mark on the product packaging. A good wire material will have two association certification marks at the same time, and the quality is more secure.
Look at the wire connector
24K gold plated connector
If the HDMI cable connector is a gold-plated connector, in addition to a more beautiful appearance, in theory there will be better corrosion resistance, electrical conductivity and high temperature resistance, but also easy to weld. Therefore, the gold-plated joints will be better than the non-gold-plated ones. Generally, the gold-plated joints on the market use 24K gold plating, and the brightness is relatively high. But it doesn't mean that the gold plating of the connector is good. The HDMI connector is the PIN pin in the HDMI connector, so this part of the HDMI cable connector is the most important.
PIN pin
PIN pin material is generally tin bronze, tin bronze has high elasticity, excellent wear resistance and corrosion resistance. The PIN pin is normally plated with nickel on tin bronze and then easily plated with gold, so a PIN pin with a well-crafted HDMI cable can observe three layers.
Look at the manufacturing materials and processes of wire rods
There are several kinds of material of the traditional HDMI wire core, the best is pure copper, or silver plating of pure copper, pure copper can guarantee the quality of signal transmission, reduce signal interference and signal loss, the second is the use of alloy and iron. As the inner core. How to identify it? Of course, it is best to distinguish between the open and close, and it is the most impossible. We can properly bend the wire. The copper core wire is soft and easy to bend. Otherwise, it may not be a copper core wire. It is easily fractured when it is repeatedly bent.
Fiber core
Now there are new changes in the HDMI cable core, I believe many consumers have heard, is the HDMI cable with fiber as the core. The optical fiber HDMI cable uses optical fiber as the transmission material. Compared with the copper signal transmission, the use of optical signal transmission can achieve higher speed, longer transmission, and more complete signal transmission. In the past, the longer the transmission distance of the copper core HDMI cable, the faster the attenuation of the transmission signal, and the optical fiber HDMI cable has exceeded this limit, easily transmit signals to more than 300m, support 4K 60hz, effectively transmit 4K audio and video signals, is a fever-class audio and video User preferred. Of course for our average consumer's daily use, copper core HDMI cable is enough.
Too thin HDMI cable is not selected
Someone said that the thicker the HDMI cable, the better, is it true?
Under normal circumstances, for the same brand of wire is true, the larger the diameter of the HDMI cable, the conductor cross-sectional area may be greater, it will be able to transmit a larger current, the ultimate performance of the HDMI cable transmission performance Good and stable. However, there are often many third-tier brands that are filled with sundries to increase the diameter of the wire, making people look very thick, so first we have to choose the big brand factory wire.
Even if it is a brand, the HDMI cable is too thin to be selected. The material of the core and the thickness of the shielding layer all have a great influence on the signal quality. Too thin wires must be “shrinking†on the core and the shielding layer, so be sure to pay more attention to it. There are four common wire gauges for HDMI. The larger the number, the finer the wire and the shorter the transmission distance. So the higher the price.
In the HDMI cable, the AWG (American Wire Gauge) value is a function of the wire diameter, which is what we often call the wire gauge. The AWG value is inversely proportional to the size of the wire diameter. The smaller the value is, the thicker the wire diameter is, the larger the current that can be carried, and the longer the number of meters that support transmission, but the corresponding price is more expensive.
In the industry, the HDMI limit transmission length of different wire gauges is basically the following values:
30 AWG limit transmission length 5-8 meters;
28 AWG limit transmission length 12-15 meters;
26 AWG limit transmission length 18-20 meters;
24 AWG limit transmission length 20-25 meters.
Simply put, the smaller wire gauge AWG value used in the same length of wire of the same brand is naturally better.
Conclusion:
In general, the purchase of HDMI cable is not necessarily the more expensive the better, as long as the version and transmission capacity (line gauge, line core) for their own audio-visual equipment, and quality clearance (line connector, certification mark and brand), is a Good HDMI cable, as for how to choose the right HDMI cable, you need to digest the above knowledge and flexible use.
HDMI interface
After two years of driving the old driver, know the difference between the HDMI interface version is no longer silly and indistinct, but also know how to buy a HDMI cable, we should all have become the old driver of the HDMI interface, and the next step is Everyone's performance time, I wish you a happy car.
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