How To Identify An Ultra High Speed HDMI Cable

In 2017, the HDMI forum has established the standard of HDMI 2.1, but until 2020, many devices are equipped with HDMI 2.1. It can be said that HDMI 2.1 integrates many features, which is a big gap compared with the previous standards. What are these features?

1. Higher bandwidth support

The interface used in HDMI 2.1 is the same as before, and the shape has not changed. According to the new definition, the maximum transmission bandwidth can reach 48Gbps, which can be said to be a great improvement. However, it is worth noting that in order to use the 48Gbps full bandwidth of HDMI 2.1, consumers must purchase "ultra high speed" HDMI transmission lines that have passed the official certification. Only qualified HDMI transmission lines can better support HDMI 2.1.

According to the HDMI forum, UHS (ultra high speed) grade cables are required to support all HDMI 2.1 standard functions. If the old 18gbps premium high speed cable is used, only part of the content can be used. In addition to the ultra-high bandwidth support, the new ush transmission line also has the characteristics of ultra-low electromagnetic interference (EMI). It can effectively improve the immunity of equipment and reduce the impact on other equipment.

2. Upgrade of dynamic HDR and resolution support

Although the bandwidth supported by HDMI 2.1 can reach 48Gbps. According to the official specifications, HDMI 2.1 can natively support 120Hz at 4K and 5K resolutions; 8K native can support 60Hz, but to reach 100Hz and 120Hz at high resolution, DSC technology is required to realize the addition of high resolution and high frame number.

Through DSC (video stream compression) technology, HDMI 2.1 can support 8K @ 120Hz or 10K resolution images. Although the display content of uncompressed native images will be more delicate, at this stage, due to the time of HDMI 2.1 project approval, DSC technology can only be used for further support of high resolution for the time being, We still have to wait for the upgrade of the new generation HDMI technology. However, HDMI 2.1 should be enough in recent years.

HDMI 2.1 fully supports bt.2020 color gamut and supports a number of HDR standards, including hdr10 + of dynamic HDR standard. With the support of dynamic metadata in dynamic HDR, it can improve the previous single image works. Only one method of additional metadata can be applied, so that each frame in the image can be output with appropriate parameters and have better display effect.

3. Addition of VRR Technology

For a series of users such as the host party, there was always a sense of delay or tear in the output of game content on TV in the past. On HDMI 2.1, VRR support is added.

The characteristics of variable refresh rate technology can effectively solve the problems of tearing, jamming and non fluency in high refresh rate images, which is similar to the synchronization technology of a / n. Although the VRR function needs the support of both output and input to get the ideal effect, the new sub era host has basically been configured, and the use effect still has a certain guarantee.

4. Improve the experience of input switching

QMS (quick media switching) fast media switching technology and automatic low delay mode (allm) technology are added to hdmi2.1. Through QMS (quick media switching) fast media switching technology, users can make faster switching when there are multiple HDMI input sources at home, so as to reduce the black screen time displayed by the device during switching.

The automatic low latency mode (allm auto low latency mode) technology can automatically judge the overall between the two devices when the two supported devices are connected, automatically pair and enable to the best mode, and effectively reduce the delay between HDMI devices through automatic switching. With the blessing of these two technologies, users can have a greater experience than before when inputting HDMI.