H/DTV - High-definition/digital television. A combination of acronyms that refers to both HDTV and DTV systems.
Half D1 - MPEG-2 picture resolution of 352 x 480 (NTSC) or 352 x 576 (PAL/SECAM). See HHR.
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.
HHR - Horizontal Half Resolution. MPEG-2 picture resolution of 352 x 480 (NTSC) or 352 x 576 (PAL/SECAM). Supported by the DVD-Video specification. Encoding video at HHR greatly reduces the bandwidth with a minor reduction in picture quality. Also called Half D1.
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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