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By PURPLELEC | 04 July 2023 | 0 Comments

HDMI Splitter Basics

  Under normal circumstances, as long as the output of the HDMI splitter is turned off, the audio will not work normally. Knowledge like this is the most basic common sense, but there are still many feelings of understanding but not understanding, like knowing the reason but not knowing why untie.

  1. When plugging and unplugging the HDMI cable, do I need to turn off the power of the equipment, or can it be hot-swapped:

  The early HDMI cables did not have a fool-proof mechanism, and the compatibility of the interface firmware was also low. Therefore, if you want to plug in and out, you must turn off the power of the device before proceeding. At that time, many people did not know that they had to power off before plugging in and out , a lot of equipment was damaged as a result. In order to prevent the same problem from happening in the recent HDMI cables, in addition to increasing the compatibility of the firmware, the potential pin is made shorter. It is the last contact when plugging in, and it is the first to be removed when unplugging. , and because its PIN pin metal is short, it is not easy to touch other metal pins, and the cause of the previous interface failure no longer exists. Therefore, even if the current HDMI cable is hot-swapped without shutting down the equipment, there is no problem.
HDMI cables

  2. Can the HDMI cable be bent?

  An HDMI cable contains 19 metal wires, plus necessary cladding and shock absorbing materials, so its metal wires are very thin, and most of them use single-crystal copper as the conductor material, so if excessive bending Or folding may cause the wire to be damaged, so even if the wire is too long during use, it should be stored in a complete circle. At the same time, the circle should be larger than the palm of the hand as much as possible, so that the wire is not easy to damage.

  In addition, when plugging and unplugging the HDMI cable, do not pull the cable body forcibly. You must grasp the terminal to plug and unplug, so that the HDMI cable can normally transmit high-resolution digital audio and video signals.

  3. Can the versions of the HDMI splitter be interoperable? Use a version 1.2 and a version 1.3B HDMI cable. The source, video equipment and amplifier are all version 1.3. What kind of signal will be transmitted in this way:

  Regardless of the version of the HDMI splitter interface built into the equipment, if two HDMI cables are used in the system at the same time, one is used from the source equipment to the multi-channel surround amplifier, and the other is used from the multi-channel surround amplifier to the video equipment. These two cables are version 1.2 and version 1.3, so the signal transmission will reduce the file to the format of version 1.2 for output; the problem is that the bandwidth specifications of version 1.2 and version 1.3 are different, as long as the signal cannot pass normally, the equipment will degrade The file allows the signal to be transmitted normally.

  Therefore, if the system equipment is version 1.2 or above or all of the interfaces are version 1.3, special attention should be paid to the version of the HDMI cable used. The former should only use version 1.2 or above. If it is the latter, all HDMI cables used must be Only version 1.3 allows all signals to be carried out with the specifications of version 1.3.

  4. Which signal cable should be used for Dolby TrueHD and DTS HD-MA audio transmission, optical fiber, coaxial or HDMI:

  Theoretically, if you want to listen to Dolby TrueHD, DTS HD-MA or Dolby Digital Plus, it is not feasible to use the previous transmission mode. You must use the 1.3 version of the HDMI cable to complete the transmission, otherwise the source equipment will be damaged. Downgrade the audio format to DD, DTS or PCM output. The reason is that the bandwidth required for sound effects is very high, and the bandwidth of the early cables was not enough, so the 1.3 version HDMI cable must be used to transmit smoothly.

  Some people may be able to transmit sound effects with the HDMI cable version 1.2. The problem is that the SKEW of the short-meter cable is the twisting of a single coaxial cable, which will cause a time difference between positive and negative potentials. If the time difference is 158ns, it can pass the version 1.3a certification. If it is within 111ns, it can pass version 1.3b, if it is higher than 158ns, it can only be version 1.2. It is also because the time difference of short-meter wires is usually lower, so it can accommodate higher bandwidth to pass through, and the interference factors are also low, so the sound effect can be transmitted. If you use a 5-meter, 8-meter, or 10-meter version 1.2 HDMI cable, the time difference between positive and negative potentials is too large, and the sound effect cannot be transmitted smoothly.

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