Glossary - Sony DVCAM DSR-25 Operating Instructions Manual

Glossary

Glossary
Audio recording mode
In the DVCAM format, the sound is
recorded in either 16 bit (Fs48k) or 12 bit
(Fs32k) mode.
B-Y signal
A chrominance signal determined by
subtracting the Y (luminance) signal from
the B (blue) signal. One of the component
signals.
Chrominance signal
Color signal containing color information
such as hue and saturation. Also called C
signal.
Clipping
The waveform tops are flattened because
the input to the amplifier exceeded the
dynamic range.
Component signal
A video signal consisting of a luminance
signal (Y) and two chrominance signals
(R-Y, B-Y).
Composite signal
A composite video signal containing
video, burst and sync signals.
Condensation
Condensation of moisture on the tape
transport mechanisms of VCRs including
the head drum. If moisture condenses on
the head drum, the tape adheres to the
drum and causes malfunctions.
Drop frame mode
In NTSC format, the actual number of
frames per second is approximately 29.97,
while that for the SMPTE time code is
specified as 30. Drop frame mode is a
mode in which time code is advanced in
such a way that the difference in frame
value between real time and time code is
corrected. In this mode, two frames are
skipped at the beginning of each minute,
except for every tenth minute, so that the
frame value for time code matches that for
real time. See also "Non-drop frame
mode."
80
(GB) Appendix
EE (Electric to Electric)
The electric signals of the images or sound
input to the VCR recording circuit are
output via only the electric circuit by
bypassing the magnetic conversion circuit,
such as a tape or head. You can check the
input signals and adjust the input level in
this mode. This is also called the EE mode.
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.
Loading
When being loaded, the tape is pulled out
of the cassette case and threaded along the
specified tape path and wrapped round the
drum to be ready for recording or
playback. Generally, this is done
automatically when you place the cassette
at the cassette entrance of the VCR. Also
called threading.
Luminance signal
The signal that determines the brightness
of the picture. Also called Y signal. One of
the component signals.
Non-drop frame mode
A mode of advancing time code in such a
way that the difference in frame value
between real time and time code is
neglected. Using this mode produces a
difference of approximately 86 seconds
per day between real time and time code,
which may cause problems when editing
programs in units of seconds using the
number of frames as a reference.
PCM audio
PCM stands for "pulse code modulation."
PCM audio means audio signals that have
been processed by pulse code modulation.
Each analog audio signal is converted into
pulses that are generated in rapid
succession, and each pulse is recorded as a
digital signal having a value of 0 or 1.
R-Y signal
A chrominance signal determined by
subtracting the Y (luminance) signal from
the R (red) signal. One of the component
signals.
S/N
Abbreviation of Signal-to-Noise (ratio).
The higher the S/N value, the less noise
and higher the picture quality.
Search mode
A VCR operating mode used when
searching for specific scenes, by viewing
the video output or time code values while
playing back the tape at various speeds in
forward or reverse direction.
Subcarrier
A sine wave imposed on the luminance
portion of a video signal and modulated to
carry color information. Its amplitude
represents color saturation and its phase,
hue.
Superimpose
To put a set of characters onto a picture so
that both can be seen at the same time.
Superimposition
Superimposing a signal onto another
signal.
S-video
A signal format in which Y (luminance)
and C (chrominance) signals are separated
to reduce interference between them so
that noiseless images are reproduced.
Sync signal
A reference signal consisting of vertical
and horizontal sync signals used for
synchronizing the scanning patterns of the
video camera and the monitor.
TBC
Abbreviation of Time Base Corrector.
Electronic circuits to electrically stabilize
the playback signals by removing color
variation and roll in the playback picture
caused by irregularity in drum rotation and
tape movement. Time base correction
reduces deterioration of picture quality
when transmitting or copying playback
signals.
Threading
See "Loading."