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Herz A measurement of cycles per second.
High Definition Television (HDTV) Refers to the new television format which has an elon-
gated shape and a significantly higher resolution than current television.
Horizontal Blanking The period of time which the electron beam is blanked off while it
moves back to the left side of the picture to get ready to start scanning the next line.
Horizontal Frequency The inverse of the time it takes for a monitor to scan from the begin-
ning of one line to the beginning of the next line; typically stated in kilohertz.
Horizontal Resolution Smallest increment of a television picture that can be discerned in
the horizontal plane. This increment is dependent upon the video bandwidth and is meas-
ured in frequency.
Hue The degrees of the vector on the vectorscope which represents a color.
(A) Distinction between colors. Red, blue, green, yellow, etc. are hues. White, black, and
gray are not considered hues. (B) The dimension of color that is referred to a scale of per-
ceptions ranging from red through yellow, green, blue, black to red.
I
IC - Integrated Circuit
IRE Institute of Radio Engineers
ITU International Telecommunications Union
Impedance A measure of how much something resists (impedes) the flow of electricity.
Insert Edit A type of edit where new video or audio is recorded onto existing materials. The
existing materials control track remains unchanged.
Interlace Scanning The process of combining two fields of video information One field has
the odd lines of the image scanned and the other field has the even lines of the image
scanned. The two fields, odd and even, are interlaced together to form one complete image,
or frame of video.
IRE Units of measurement dividing the area between the bottom of sync and white level into
140 equal units. 140 IRE units are equal to 1 volt peak-to-peak.
Iris The amount of light transmitted through a lens is controlled by an adjustable diaphragm,
or iris, located in the lens barrel. The opening is referred to as the aperture, and the size of
the aperture is controlled by rotating the aperture control ring on the lens barrel. The
graduations on the lens barrel are expressed in terms of the focal length f of the lens di-
vided by the diameter of the aperture at that setting. This ratio is called the f-number.
J
JPEG Joint Photographic Experts Group is a subcommittee of the International Standards
Organization (ISO), which defines standards for digital photographic compression and de-
compression.
Jitter Small and rapid variations in a waveform due to mechanical disturbances, changes in
the characteristics of components, supply voltages, imperfect synchronizing signals, cir-
cuits, etc.
K
K - Or Kilo is the term used in computers to define 1,024 bytes.
KHz Kilohertz
Kelvin An International standard unit of color temperature. This standard is measured in
digress.
Kilohertz (KHz) A 1000 Hertz
L
LCD Liquid Crystal Display -- a display that works by controlling the opacity of LCD "glass"
by varying the electrical signal. Each individual pixel acts as a shutter, to modulate light
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