CCTV Glossary
Cascadia Video Products LLC
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H
HAD - Hole accumulated diode. A type of CCD sensor with a layer designed to accumulate holes
(in the electronic sense), thus reducing noise level.
HDD - Hard disk drive. A magnetic medium for storing digital information on most computers and
electronic equipment that process digital data.
HDDTV - High definition digital television. The upcoming standard of broadcast television with
extremely high resolution and aspect ratio of 16:9. It is an advancement from the analog high
definition, already used experimentally in Japan and Europe. The picture resolution is nearly
2000×1000 pixels, and uses the MPEG-2 standard.
HDTV - High definition television. It usually refers to the analog version of the HDDTV. The
SMPTE in the US and ETA in Japan have proposed a HDTV product standard: 1125 lines at 60 Hz
field rate 2:1 interlace; 16:9 aspect ratio; 30 MHz RGB and luminance bandwidth.
Headend - The electronic equipment located at the start of a cable television system, usually
including antennas, earth stations, preamplifiers, frequency converters, demodulators, modulators
and related equipment.
Helical scan - A method of recording video information on a tape, most commonly used in home
and professional VCRs.
Horizontal Drive (also Horizontal sync) - This signal is derived by dividing sub-carrier by 227.5
and then doing some pulse shaping. The signal is used by monitors and cameras to determine
the start of each horizontal line.
Horizontal resolution - Chrominance and luminance resolution (detail) expressed horizontally
across a picture tube. This is usually expressed as a number of black to white transitions or lines
that can be differentiated. Limited by the bandwidth of the video signal or equipment.
Herringbone - Patterning caused by driving a color-modulated composite video signal (PAL or
NTSC) into a monochrome monitor
.
Horizontal retrace - At the end of each horizontal line of video, a brief period when the scanning
beam returns to the other side of the screen to start a new line.
Horizontal sync pulse - The synchronizing pulse at the end of each video line that determines the
start of horizontal retrace.
Hertz - An unit that measures the number of certain oscillations per second.
Housings, environmental. Usually refers to cameras’ and lenses containers and associated
accessories, such as heaters, washers and wipers, to meet specific environmental conditions.
HS - Horizontal sync.
Hue (tint, phase, chroma phase) - One of the characteristics that distinguishes one color from
another. Hue defines color on the basis of its position in the spectrum, i.e., whether red, blue,
green or yellow, etc. Hue is one of the three characteristics of television color: see also Saturation
and Luminance. In NTSC and PAL video signals, the hue information at any particular point in the
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