Why We Need An HDMI Cable In This Day And Age

Why We Need An HDMI Cable In This Day And Age

High Definition Multimedia Interface cables (HDMI cable) is able to use a digital signal to send a progressive scan. What exactly is that anyway?

An analogue signal is an electric current that varies as it’s sent up a wire. Information is relayed by altering the current many times per second. It’s a truly high definition signal, whereas digital can only be as fine as is allowed by processing power. Analogue current signals are just that: currents of electrons conducting their way through whatever metal is in the wire. Sometimes it’s gold. You can zoom into this signal for a long time before it starts to break down. But it would be impractical to create such fine signals, as you’d need very fine equipment.

It only takes a faster processing chip to create very fine digital signals though. If you were to zoom into it, it would be not seem so fine, but it can be fine enough for its needs very easily. A digital signal is a stream of data that can describe anything you put to your mind to programming.

The ubiquitous “ones and zeros” that people are always talking about make up digital signals, but what is that really? “Ones” tell circuits on a processor to open, and “zeros” tell it to close. Since a computer is really nothing more than an input-output device, those opening and closing circuits are just making more ones and zeros for another piece of the hardware.

Interlaced scans are the old method of displaying a picture. It’s a series of half frames, between twenty-four and thirty, depending on where you live in the world. The frames are divided by many small rows, such as odd and even, with the following frame being the even rows. Never during this method does a complete frame show up on screen, but it all happens so fast, your brain doesn’t notice the difference. This is very convenient a method, because you only need to send half the information for every frame.

Progressive scans are whole pictures being sent, each frame. The old monitors, cathode ray tubes, worked by firing a stream of electrons at the back of the screen. It was done in the same pattern as the incoming frame, over and over and over again. But HD monitors receive the information row by row, making a whole picture each time.

An HDMI cable can send all this data, which can be created quickly without the need of finer components.

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