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hdmi cables

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HDMI cables are a type of highly efficient cable used to connect to HMDI outputs mounted on HD systems such as home theater or television sets. Unlike past systems that required two types of cables to deliver the video and the audio signal, one single HDMI cable is capable of carrying huge amounts of electronic information (about twice as much as is usually necessary for peak performance).

Similar to the USB ports on computers, HMDI fall subject to different standards. One advantage of using newer versions of HMDI is that they are always compatible with earlier versions, so there is never a danger of using a version that is “too new” for last year’s TV set.

Traditionally, HDMI cables are split into standard and high-speed, depending on the performance they can deliver. Standard cables are tested at 74.5 MHz, while high speed cables are tested at 340 MHz. With the most recent release of the 1.4 specification (which appeared in 2009), the categorization of HDMI cables is as follows: Standard HDMI Cable – which can deliver resolutions of up to 720p and 1080i, Standard HDMI Cable with Ethernet, Automotive HDMI Cable (which ensures peak performance for your vehicle), High Speed HDMI Cable – 1080p, 3D and Deep Color (describing literally billions of color shades) and High Speed HDMI Cable with Ethernet.

HMDI cables are compatible with single-link earlier versions of digital interfaces, such as DVI-D and DVI-I, and are simple to integrate to mostly any type of digital device video card that sports an appropriate input.

While all of the traditional interfaces are analog, HDMI is fully digital and uncompressed. To understand why an uncompressed HDMI signal is superior and true to the original, we can look at how analog and digital interfaces work. When using an analog interface, an initial digital signal is translated into a less precise analog signal, then carried to the television set, and ultimately converted back into a digital signal by the TV, to be displayed on the screen. Each time the signal is altered and converted, it forfeits some of its integrity, which means part of the picture quality is compromised. An HDMI interface, on the other hand, preserves the initial signal, eliminates conversion, and thus delivers a signal that is true to the source.

You’ll find bloggers talking about HDMI cables at sites like msacsnetmeeting.kennesaw.edu and ncsu.edu.

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