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Standby-off mode
One of the stop modes.
In this mode, head drum
rotation is stopped and
the tape tension is
slackened. It is not
possible to switch
instantaneously from this
mode to recording or
playback mode. This
mode is not harmful to
the tape or heads.
Standby-on mode
One of the stop modes.
In this mode, the head
drum continues rotating
and the tape remains
wound onto the drum.
This mode enables
instantaneous switching
to recording or playback
mode. To prevent
damage to the tape or
heads, the device
automatically switches
from standby-on mode
to standby-off mode
after a certain period of
time.
Subcarrier
Color information
contained in a composite
video signal. Its
amplitude is for color
saturation and its phase
to color burst is for hue.
Superimpose
To put one picture (or
characters) onto another
so that both can be seen
at the same time.
Sync
A reference signal
consisting of vertical and
horizontal sync signals
used for synchronizing
the scanning patterns of
the video camera and the
monitor.
Tape tension
The tension applied to a
tape. For the tape to run
properly while being
wound on the drum, it
must be pulled lightly in
the opposite direction to
the direction of
transport. Improper
adjustment of tape
tension can cause
deviations along the
temporal signal axis. In
analog VTRs, these
deviations are evident as
skew and distortion in
the upper part of the
screen.
Time code
The timecode is a tape
position information
signal that includes time
and frame data that are
recorded onto the tape so
as to facilitate searching
of editing points and
recorded scenes when
viewing or editing.
SMPTE timecode is
applied to NTSC system,
and EBU timecode is
applied to PAL/SECAM
systems. There are two
kinds of signal recorded
on tape. One is
longitudinal timecode
(LTC) recorded along
the tape (the same way
as audio and CTL
signals). The other is
vertical interval
timecode (VITC). This
code is inserted in the
vertical blanking period
and its recorded on the
tape with video signals.
Time data
This refers either to time
data that is generated by
a timecode generator or
time data that is played
back from a tape and
read by a timecode
reader.
A-25
Appendixes
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