The cause is a friend with a 20-meter
HDMI CABLE, and then found that the signal attenuation is serious, just to give you some knowledge about HDMI cables, this article mainly refers to Wikipedia: (https://bk.tw.lvfukeji.com/wiki/HDMIhttps://bk.tw.lvfukeji.com/ baike-DisplayPort), in addition to thank Mr. Xia's technical support.
High Definition Multimedia Interface (English: High Definition Multimedia Interface, abbreviation: HDMI) is a fully digitalized image and sound sending interface that can send uncompressed audio and video signals.HDMI can be used in set-top boxes, DVD players, personal computers, videotouring instruments, synthesized amplifiers, digital stereos and televisions, and other devices. HDMI can be used in set-top boxes, DVD players, personal computers, television musical instruments, integrated amplifiers, digital audio and television sets, etc. HDMI can send audio and video signals at the same time, due to the use of audio and video signals with the same cable, greatly simplifying the installation of the system wiring.
1. Different HDMI connectors
From left to right are HDMI (A TYPE), mini-HDMI (C TYPE) and Micro HDMI (D TYPE).
HDMI (A TYPE): Applied to HDMI version 1.0, there are a total of 19 pin, specifications for the most common HDMI connector specifications for 4.45 mm × 13.9 mm, phase point-to-point in the DVI Single-Link transmission. Before HDMI 1.2a, the maximum TMDS transmission is 165MHz, so the maximum transmission specification can only be 1600×1200 (TMDS 162.0 MHz).
mini-HDMI (C TYPE): commonly known as mini-HDMI, applied to HDMI version 1.3, a total of 19pin, can be said to be a scaled-down version of the HDMI A type, the specifications of 2.42 mm × 10.42 mm, but the definition of the foot position has changed. It is mainly used in portable devices, such as DV, digital cameras, portable multimedia players and so on. Due to the size limitation, some graphics cards will use mini-HDMI, and users have to use an adapter to convert it to a standard-sized Type A before connecting it to the monitor.
?Micro HDMI (D TYPE): Applied to HDMI version 1.4, it has a total of 19pins, with a specification of 2.8 mm x 6.4 mm, but the definition of the feet has been changed. The new Micro HDMI interface will be about 50% smaller than the current 19-pin MINI HDMI version of the interface, which can be used for cameras, cell phones and other portable devices to bring up to 1080p resolution support and the fastest transmission speed of 5GB.
2. Comparison with DP
As DP out of the time is relatively late, so against their respective latest standards or DP accounted for a little advantage, but currently on the market or HDMI2.0 and DP1.4-based. HDMI2.1 has been out of some corresponding products such as televisions, video cards, etc., and DP2.0 is said to be listed in 2020, but have not yet seen.
In daily use or HDMI popularity is relatively higher, TVs, computer monitors, set-top boxes, etc. are relatively easy to find HDMI interfaces, personal opinion, taking into account the HDMI royalties, the major manufacturers should be more inclined to free DP, the future development of DP may be better.
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3. Transmission distance
The main factors affecting the cable material itself (gold, silver, and gold, copper) and the thickness of the material and the transmission of the signal bandwidth
Commonly used in the past is a copper core, the general transmission of 1080P no more than 15 meters, 4K no more than 5 meters, it should be noted that sometimes HDMI transmission through the matrix, if the input + output more than 20 meters, the matrix does not come with amplification, the signal is likely to be attenuated.
Now out of a fiber optic HDMI cable, mainly with the following advantages:
Long transmission distance, can reach 300 meters
Not subject to external electromagnetic interference
Light weight and volume
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4. Other common problems:
Use HDMI cable to avoid excessive bending and twisting of the wire, if you go to the tube, use 25 tubes in the turn;
If you go in to unplug, then choose gold-plated connectors, which can reduce poor contact;
Some 20 meters or more of HDMI cable because with signal amplification, so it is divided into positive and negative to pay attention to the output and output;
Try to use the finished cable, although the HDMI connector can also be welded, but the pins are many and dense, prone to problems '
HDMI is able to transmit audio, connected to the computer, pay attention to the choice of audio output, separate extraction of audio needs to increase the audio de-embedding equipment
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