H
H/DTV- High-definition/digital television. A combination of acronyms that refers to both HDTV and DTV systems.
Half D1- An MPEG-2 video encoding mode in which half the horizontal resolution is sampled (352x480 for NTSC, 352x576 for PAL).
HAVi- A consumer electronics industry standard for interoperability between digital audio and video devices connected via a network in the consumer's home.
HDCD- High-definition Compatible Digital. A proprietary method of enhancing audio on CDs.
HDTV- High-definition television. A video format with a resolution approximately twice that of conventional television in both the horizontal and vertical dimensions, and a picture aspect ratio of 16:9. Used loosely to refer to the U.S. DTV System. Contrast with EDTV and IDTV.
Hertz- See Hz.
hexadecimal- Representation of numbers using base 16.
HFS- Hierarchical file system. A file system used by Apple Computer's Mac OS operating system.
Highlight Information (HLI)- This is used to specify button highlights for menus. HLI contains information on the button number, highlight timing, palette for sub-picture highlights, coordinates of the button, etc.
High Sierra- The original file system standard developed for CD-ROM, later modified and adopted as ISO 9660.
horizontal resolution- See lines of horizontal resolution.
HQ-VCD- High-quality Video Compact Disc. Developed by the Video CD Consortium (Philips, Sony, Matsushita and JVC) as a successor to VCD. Evolved into SVCD.
HRRA- Home Recording Rights Association.
HSF- See High Sierra.
HTML- Hypertext markup language. A tagging specification, based on SGML (standard generalized markup language), for formatting text to be transmitted over the Internet and displayed by client software.
hue- The color of light or of a pixel. The property of color determined by the dominant wavelength of light.
Huffman coding- A lossless compression technique of assigning variable-length codes to a known set of values. Values occurring most frequently are assigned the shortest codes. MPEG uses a variation of Huffman coding with fixed code tables, often called variable-length coding (VLC).
Hz- Hertz. A unit of frequency measurement. The number of cycles (repetitions) per second.
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