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H.264

It is a codec standard for video compression developed by the ITU-T Video Coding Experts Group (VCEG) together with the ISO/IEC Moving Picture Experts Group (MPEG), and is equivalent to MPEG-4 Part 10, or MPEG-4 AVC (for Advanced Video Coding). H.264/AVC/MPEG-4 Part 10 is popular, especially for high-definition video.  It contains a number of new features that allows it to compress video much more effectively than older standards and to provide more flexibility for application to a wide variety of network environments.  Taking advantage of today's high-speed chips, H.264 delivers MPEG-4 quality with a frame size up to four times greater.  It can also provide MPEG-2 quality at a reduced data rate, requiring as little as one third the original bandwidths.  

Half D1

This is an MPEG-2 stream where it only has half the horizontal resolution. This would be 352x480 (NTSC) and 352x576 (PAL).

Hard Disk

A device, also called hard disk drive that contains one or more inflexible platters coated with material in which data can be recorded magnetically with read/write heads. The hard disk exists in a sealed case that protects it and allows the head to fly 10 millionths to 25 millionths of an inch above the surface of a platter. Data can both be stored and accessed much more quickly than on a floppy disk.

High-Definition Multimedia Interface, HDMI

The HDMI is a compact audio/video connector interface for transmitting uncompressed digital streams.  It represents a digital alternative to consumer analog standards.  HDMI connects digital audio/video sources such as set-top boxes, Blu-ray Disc players, personal computers, video game consoles, and AV receivers to compatible digital audio devices, computer monitors, and digital televisions.

High-definition television, HDTV

HDTV provides up to five times higher resolution than standard analog TV.  HDTV has better color fidelity and in 16:9 format.  The two most important HDTV standards today are SMPTE 296M and SMPTE 274M, which are defined by the Society of Motion Picture and Television Engineers, SMPTE.

Horizontal Resolution

The word "resolution" when applied to TV screens is not the same as the word resolution when applied to computer monitors.  PC monitor resolution is the measure of width x height in pixels.  TV resolution is measures in physical lines- Horizontal Lines - the number of visible lines (while visual line is the actual line sent into the television created from the signal feeding the TV by the input device or via the airwaves. There are 525 horizontal scan lines in every television frame - no matter what signal you feed in, 40 invisible lines used for fly back (vertical retrace) and approx 485 visible lines or 480 for simplicity - this is also the "maximum" resolution", since no matter what signal you feed into the TV, it can do not better than this.)  Vertical Lines, there are really only horizontal lines since the beam scans left-to-right.  Nevertheless, the horizontal resolution is sometimes stated as vertical lines, but it is actually just the max number of allowable signal phase changes as the beam moves from left to right.

The horizontal resolution is measured by determining how many black/white pairs of pixels we can squeeze into the picture from left to right.  Physical horizontal resolution (max resolution) is a function of the signal bandwidth.  Visual horizontal resolution is dependent on the input signal, which varies depending on the platform used.  Visual resolution can only be as good as the weakest link in the chain - so the max resolution of your Television will not be attained if your input device and media does not support it.  Different input sources and their approximate horizontal resolution capability can be VHS/VHS-C 220-240 lines, Analog TV Broadcast 330 lines , Analog Cable TV 330 lines, Standard Digital Cable 330 - 500 lines, S-VHS/S-VHSC 400 lines, DVD-R/-RW/+R/+RW 250 - 400+ lines (Depends on recording mode and compression used), Commercial DVD Up to 540 lines etc.  As you can see, there is quite a difference in the detail that different video formats can input into a TV or video display.  Basically, VHS is on the bottom end of things, while DVD represent the best that analog video can currently produce in terms of detail.

Host

In computer networking, a network host, Internet host or host is a computer connected to the Internet - or more generically - to any type of data network.  A network host can host information as well as client and/or server software.  In computer networking, a network host, Internet host or host is a computer connected to the Internet - or more generically - to any type of data network.  A network host can host information as well as client and/or server software.

Host Name

A hostname is the unique name by which a network-attached device (which could consist of a computer, file server, network storage device, fax machine, copier, cable modem, etc.) is known on a network.  The hostname is used to identify a particular host in various forms of electronic communication such as the World Wide Web, e-mail or Usenet.  Host names are typically used in an administrative capacity and may appear in computer browser lists, active directory lists, IP address to hostname resolutions, email headers, etc.  They are human-readable nicknames, which ultimately correspond to unique network hardware MAC addresses.  In some cases the host name may contain embedded domain names and/or locations, non-dotted IP addresses, etc.

Hue

It is the position of a color along the color spectrum, ie. the color's direction from white.  For example, green is between yellow and blue. This attribute can be set using Display in Control Panel.

Hyperlink

In computing, a hyperlink is a reference in a document to an external piece of information.  It is usually highlighted, with colour and underlined text or a graphic that you click to go to a file, a location in a file, an HTML page on the World Wide Web, or an HTML page on an intranet.  Hyperlinks can also go to newsgroups and to Gopher, Telnet, and FTP sites.

Hypertext Markup Language, HTML

A simple markup language used to create hypertext documents that are portable from one platform to another. HTML files are simple ASCII text files with codes embedded (indicated by markup tags) to denote formatting and hypertext links.

Hypertext Transfer Protocol, HTTP

The protocol used to transfer information on the World Wide Web.  An HTTP address (one kind of Uniform Resource Locator [URL]) takes the form: http://www.microsoft.com.