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hard
set:
Traditionally built out set (as in hammer and nails).
Harmonic
Distortion:
When any signal is passed through an electronic circuit, the signal
may be changed in many ways. In video, the image may become blurred,
noisy or contain shadows. In audio, odd harmonics (third, fifth, etc.)
produce harsh and unpleasant sounding audio distortion.
HDTV>HDTV:
High Definition TV. A proposed standard for producing high resolution
video, recommending the doubling of the current 525 lines per
picture to 1050 lines and increasing the screen aspect ratio (width: height) from the current
12: 9 to 16: 9, which would create a television screen shaped
more like a movie screen and provide image quality approaching
35mm film photography.
Helicalscan>Helical
Scan:
A method of recording video information diagonally on a tape,
used in home and professional VCRs. High speed rotating video
heads scan these diagonal video tracks, giving an effective tape
speed much higher than the actual tape speed allowing more information
to be recorded on a given length of magnetic tape.
HI-8>HI-8:
An improved version of the 8mm tape format capable of recording better
picture resolution (definition). A higher-density tape is required
which provides a wider luminance bandwidth, resulting in sharper picture quality
(over 400 horizontal lines vs. 240 for standard 8mm) and improved
signal-to-noise ratio. Camcorders using this format are very small,
light and provide a picture quality similar to S-VHS.
HI-FI>HI-FI:
High Fidelity. Most commonly used to refer to the high quality
audio tracks recorded by many VCRs. These
tracks provide audio quality approaching that of a CD. However,
because they are combined with the video signal before recording,
audio dubs using them are impossible without
re-recording the video.
High
Resolution:
An adjective describing improvement in image quality as a result
of increasing the number of pixels per square inch. Called hi-res
for short.
High
Sierra Format:
A standard format for placing files and directories on
CD-ROM, revised and adopted by the International
Standards Organization as ISO 9660.
Hiss>Hiss:
The most common audible noise component in audio
recording, stemming from a combination of circuit and tape noise.
Several noise reduction systems are available, such
as Dolby, DBX, DNR (Dynamic Noise Reduction),
DNL (Dynamic Noise Limiter), to help alleviate such problems.
Horizontal
Resolution:
Rating of the fine detail (definition) of a TV picture, measured in scan
lines. The more lines, the higher the resolution and the better
the picture. A standard VHS format VCR produces 240 lines of horizontal
resolution, while over 400 lines are possible with S-VHS, S-VHS-C, and Hi-8 camcorders.
Horizontalsync>Horizontal
Sync:
The sync pulse signal produced at the beginning
of each video scan line which keeps a video monitor's horizontal scan rate in step with
the transmission of each new line. (See Blanking Level.)
House
Reference:
Also called Reference Video or Reference Black. Provides a master
timing reference for an entire video facility. All pieces of gear
in the house must march to the same drummer.
HSB:
Hue Saturation Brightness. With the HSB model, all colors can
be defined by expressing their levels of hue (the pigment), saturation (the amount
of pigment) and brightness (the amount of white included), in
percentages.
Hue>Hue:
Often used synonymously with the term tint. It is the dominant
wavelength which distinguishes a color such as red, yellow, etc.
Most commonly, video hue is influenced by:
A camera's
white balance
Scene
lighting
Hz:
Abbreviation for Hertz; cycles per second.
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