Sun Surveillance, wireless solar powered video surveillance, glossary f

The Glossary

An all inclusive glossary of security lingo is provided for your convenience. This list
will undoubtedly be helpful when delving in to the realm of security.

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 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.
Head end - 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 - A 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 picture is conveyed by the
corresponding instantaneous phase of the active video sub carrier.
Hum - A term used to describe an unwanted induction of mains frequency.
Hum bug - Another name for a ground loop corrector.
Hyper-HAD - An improved version of the CCD HAD technology, utilizing on-chip micro-lens technology to
provide increased sensitivity without increasing the pixel size.

Courtesy of CCTV Labs and CCTV focus magazine

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