How Hdmi Cables Work? How Do They Transfer Data?

HDMI stands for High-Definition Multimedia Interface, and HDMI cables are cables that transmit high quality audio and video data. Such cables link media sources like DVD players, PCs, video game consoles, LCD/LED TVs, and cable boxes. They function much like the old analog cables, but they are just designed to convert analog signals and transmit them as digital signals. One reason high-definition televisions have exceptional picture quality is the ability of the cables to transmit high-quality signals. In home theater systems, these cables have a crucial role in the transfer of signals from one device to another.

The female end of the cable plug has 19 pins. Each of these pins has its own purpose. The first nine pins translate analog signals to digital data. The packets of digital data are then transmitted across many data channels.

The nine pins are grouped into three, because three pins work together to convert and convey digital data through a single channel.

Pins 10, 11, and 12 control the passage of data through the first nine pins. In addition, they make certain that data signals are properly coordinated.

The rest of the pins have varied roles. They provide power to the cable and ensure continuous, undisrupted data transmission between devices.

Note that the cable has a pair of twisted wires. The core transmission capability of the HDMI cable depends on the twisted wires. For instance, before transmitting a signal from a cable box to a TV, the cable keeps the signals from decaying by converting and encoding them.

The two twisted wires have two functions. One of the wires convey data to the media player, while the other wire conveys a mirror image or an inverse copy of the data to the media player. As the media player receives both signals, it looks for the difference, which indicates signal decay. The media player shall then compensate for this degradation.

There are certain factors that lead to the degradation of signals. One is the length of cables. Cables for high-definition systems can be any length. But the rule is, the longer the wires, the more likely signal loss can occur. Most makers of HDMI cables do not make cables more than 16 feet long. High quality materials can reduce chances of signal decay. Of course, when incorporated in high-definition cables, they increase the cost. Such expensive cables are used in large theaters.

Changes have happened to these cables during the last ten years. As versions of high-definition devices grow in number, so do the types of cables. Right now, cables are made to support 3-D picture formats. They have higher bandwidth resolution than the Type A high-speed HDMI 1.4 cable, whose minimum bandwidth is 10.2 Gbps. While there are long, thick cables, there are also the Type C cables that are used with portable gadgets. Even these mini-cables still contain 19 pins.

Cables today also have the Ethernet feature to allow internet transmissions. The added Ethernet capability does not affect the cable’s audio-visual transmission capacity.

Cables are also advancing to meet the needs of advancing technology. Well, technology evolves and so should its components.

By: Cedric Loiselle

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