With the popularity of smart TV boxes, more and more families are using HDMI high-definition cables to connect TV boxes and TVs. As long as it is not a very old TV model, it usually has an HDMI interface. HDMI stands for High Definition Multimedia Interface (HDMI) and is a digital video/audio interface technology. It is a dedicated digital interface suitable for image transmission. It can simultaneously transmit audio and video signals. Transmission speed is 4.5GB/s.
The HDMI standard was born in 2002. Hitachi, Panasonic, Philips, Silicon Image, Sony, Thomson, Toshiba and seven companies jointly established the HDMI high-definition multimedia interface organization, and began to develop a new digital video/audio interface that meets the high-definition standards. technology. After more than six months of preparation, the HDMI Organization formally released the HDMI 1.0 standard on December 9, 2002, marking the official entrance of the HDMI technology to the historical stage.
About HDMI, we also need to know the following usage details:
First, HDMI can't be hot swapped
In theory, HDMI is hot-swappable. But why is hot plugging causing the device to burn? The actual situation is that when the HDMI is hot-swapped, the ports are often burned out, that is, the static electricity is damaged. Since HDMI is a very high-speed digital signal, because of the high speed, the anti-static protection circuits used when designing the transmitting and receiving chips are generally only used. Can withstand 5-8KV electrostatic voltage, but in real life, if the environment is dry, and there are conditions to generate electrostatic voltage, tens of thousands of V electrostatic voltage is common, in the well-designed source and display, usually at the expense of some capacitors The ESD protection circuit is configured for the margin. However, some devices may burn the chip when the static HDMI cable is inserted in order to save costs without an ESD protection circuit. In this regard, the friend who does the HDMI wire test is definitely clear because NA and TDR also have anti-static requirements. This is the same reason. Another reason is our grid: China's power outlet is two pins, no ground. General users will not connect the ground cable when installing LCD TVs and projectors. This makes it easier to form static electricity. Due to the above reasons, when the HDMI is hot-swapped, it is only possible to pay a visit to Guan Gong and then fight for the character. In addition, the optional HDMI high-definition cable with static protection, the current HDMI cable with static protection has eNB HDMI high-definition cable, dual port support 30,000 volts electrostatic protection. It is safer to use an HDMI HD cable with electrostatic protection.
Second, what is the difference between HDMI2.0 and HDMI1.4
HDMI2.0 is an upgraded version of HDMI 1.4. The two main differences are as follows:
1.HDMI 2.0 does not define new data lines and connectors, and therefore maintains perfect backward compatibility with HDMI 1.x. Simply put, if the interface on your home TV is HDMI 1.4, then the HDMI 2.0 cable is also available.
2. HDMI 1.4 can already support 4K, but subject to the bandwidth, the highest can only reach 3840 × 2160 resolution and 30FPS frame rate, HDMI 2.0 will expand the bandwidth to 18Gbps, can support 3840 × 2160 resolution and 50FPS, 60FPS frame rate.
Simply put, HDMI 1.4 only supports 4K video with 30FPS frame rate. If it exceeds this frame rate, it will not be able to transmit smoothly. Because of this, we must look for HDMI2.0, HDMI1.4 when purchasing. Sooner or later is to be eliminated!
Third, long-distance transmission has strict requirements on wire rods
For 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. For good wire, the core wire is silver plated, and the low-cost wire is tin plated.
2. Production process. The outer layer of insulator foam is closely related to the transmission quality, low-grade foam production equipment as long as 100,000 yuan, high-end equipment up to 16 million yuan, the quality of the disparity.
3. The shielding effect. The HDMI cable produced by the low-end equipment has a shielding effect of only 80 to 85%, while the high-grade wire shielding efficiency reaches 95%.
Long-distance transmission, in the transmission of 1080P or 720P signal, the difference is not large, but the transmission of 1080P signal, the wire is very demanding, if the quality of the line is not off, there is a screen jump, large erythema, 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 outside thickness of the line. Many lines that look very thick are just thick skins. In fact, 1080P signals cannot be transmitted at all.
The HDMI standard was born in 2002. Hitachi, Panasonic, Philips, Silicon Image, Sony, Thomson, Toshiba and seven companies jointly established the HDMI high-definition multimedia interface organization, and began to develop a new digital video/audio interface that meets the high-definition standards. technology. After more than six months of preparation, the HDMI Organization formally released the HDMI 1.0 standard on December 9, 2002, marking the official entrance of the HDMI technology to the historical stage.
About HDMI, we also need to know the following usage details:
First, HDMI can't be hot swapped
In theory, HDMI is hot-swappable. But why is hot plugging causing the device to burn? The actual situation is that when the HDMI is hot-swapped, the ports are often burned out, that is, the static electricity is damaged. Since HDMI is a very high-speed digital signal, because of the high speed, the anti-static protection circuits used when designing the transmitting and receiving chips are generally only used. Can withstand 5-8KV electrostatic voltage, but in real life, if the environment is dry, and there are conditions to generate electrostatic voltage, tens of thousands of V electrostatic voltage is common, in the well-designed source and display, usually at the expense of some capacitors The ESD protection circuit is configured for the margin. However, some devices may burn the chip when the static HDMI cable is inserted in order to save costs without an ESD protection circuit. In this regard, the friend who does the HDMI wire test is definitely clear because NA and TDR also have anti-static requirements. This is the same reason. Another reason is our grid: China's power outlet is two pins, no ground. General users will not connect the ground cable when installing LCD TVs and projectors. This makes it easier to form static electricity. Due to the above reasons, when the HDMI is hot-swapped, it is only possible to pay a visit to Guan Gong and then fight for the character. In addition, the optional HDMI high-definition cable with static protection, the current HDMI cable with static protection has eNB HDMI high-definition cable, dual port support 30,000 volts electrostatic protection. It is safer to use an HDMI HD cable with electrostatic protection.
Second, what is the difference between HDMI2.0 and HDMI1.4
HDMI2.0 is an upgraded version of HDMI 1.4. The two main differences are as follows:
1.HDMI 2.0 does not define new data lines and connectors, and therefore maintains perfect backward compatibility with HDMI 1.x. Simply put, if the interface on your home TV is HDMI 1.4, then the HDMI 2.0 cable is also available.
2. HDMI 1.4 can already support 4K, but subject to the bandwidth, the highest can only reach 3840 × 2160 resolution and 30FPS frame rate, HDMI 2.0 will expand the bandwidth to 18Gbps, can support 3840 × 2160 resolution and 50FPS, 60FPS frame rate.
Simply put, HDMI 1.4 only supports 4K video with 30FPS frame rate. If it exceeds this frame rate, it will not be able to transmit smoothly. Because of this, we must look for HDMI2.0, HDMI1.4 when purchasing. Sooner or later is to be eliminated!
Third, long-distance transmission has strict requirements on wire rods
For 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. For good wire, the core wire is silver plated, and the low-cost wire is tin plated.
2. Production process. The outer layer of insulator foam is closely related to the transmission quality, low-grade foam production equipment as long as 100,000 yuan, high-end equipment up to 16 million yuan, the quality of the disparity.
3. The shielding effect. The HDMI cable produced by the low-end equipment has a shielding effect of only 80 to 85%, while the high-grade wire shielding efficiency reaches 95%.
Long-distance transmission, in the transmission of 1080P or 720P signal, the difference is not large, but the transmission of 1080P signal, the wire is very demanding, if the quality of the line is not off, there is a screen jump, large erythema, 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 outside thickness of the line. Many lines that look very thick are just thick skins. In fact, 1080P signals cannot be transmitted at all.
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