Grass Valley PROFILE FAMILY v.2.5 - Manual (Page 372)

Glossary
372 Profile Family
Hard disk
Computer systems use hard disks as permanent storage devices. Information
is magnetically recorded on spinning platters for quick access.
Hardware
The physical parts of a system, such as a computer, display monitor, or
keyboard.
Help
Profile software applications come with on-line help manuals that include
examples, demonstrations, and reference information about using the
application. The manual, and the Help window it is displayed in, follow the
Microsoft standard.
Hertz (Hz)
Hertz is the unit of frequency named after the physicist Heinrich Hertz
(1857–1894). One hertz (Hz) is equal to 1 cycle/second.
Hue
A term that describes a color family (for example, red or yellow). Hue is a
polar coordinate—that is, it moves in a circular motion around the color
spectrum—and ranges from 0 to 360, with 0 being red. Hue is measured in
degrees. See Chroma.
I-frame
MPEG uses motion prediction to increase efficiency, that is, it reduces data
by not duplicating pixels that do not change from frame to frame. It does so
by relying on a GOP. A GOP is composed of I-frames, B pictures, and P
pictures. An I-frame (or I picture) is analogous to a JPEG frame in that it is
a self-contained picture. It does not use motion vectors as do the B picture
and P picture. See B Picture, P Picture.
Input device
A device that allows you to send information to a software application.
Typical input devices include keyboards, mice, tablets, and trackballs. See
Pointer and Pointing Device.