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Emphasis
The signal is
emphasized at high
frequencies. During
playback, it is de-
emphasized. This
suppresses noise without
affecting the original
signal.
External lock
Synchronizing one
equipment (slave unit) to
another (master unit).
The signal and tape run
of the VTRs used for
editing, player and
recorder, are usually
synchronized.
Head drum
A metal cylinder to
which a video head is
attached. This drum is
rotated at high speeds in
synchronization with the
sync signal during
recording and playback.
Insert editing
Editing in which new
video/audio is added
into the middle of
existing recorded video/
audio.
IRE
A unit for representing a
video level laid down by
the IRE (Institute of
Radio Engineers). The
IRE is now the IEEE
(Institute of Electric and
Electronic Engineers).
Non-drop frame
mode
The number of frames of
the timecode and video
run is not adjusted.
When you use the
timecode in non-drop
frame mode, the real
playback time will be
about 86 seconds shorter
per day than the
timecode. If you edit
frame by frame or if you
determine the length of a
shot by counting the
timecode, use drop
frame mode.
Loading
Also called "threading".
To pull the tape out of
the cassette case, thread
it along the specified
tape path, and wrap it on
the drum in order to
prepare it for recording
or playback. The VTR
automatically loads the
cassette tape when you
insert the cassette into
the cassette
compartment. There are
two loading modes:
standby-on mode and
standby-off mode.
LTC
Abbreviation of
"Longitudinal Time
Code". This timecode is
recorded on a
longitudinal track on the
tape. Reading is
unreliable at low speeds,
and not possible at all
during still playback.
See also "VITC".
Luminance signal
A signal that determined
the brightness of the
picture. Also called "Y
signal".
Preroll
Running of a video tape
to a prior to an edit-start
point to enable the tape
to reach a steady speed
and to be synchronized
with other video tapes.
Quantization
The level resolution
when an analog signal is
sampled before
converted into a digital
signal. 8-bit quantizing
has 256 levels and 10-bit
quantizing has 1024
levels. Generally, 8-bit
quantizing is used for
video signals and 16-bit
quantizing is used for
audio signals. The fewer
the quantizing steps, the
more distortion is in the
analog signal when the
digital signal is
reconverted into analog
signal.
A-23
Appendixes
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