Glossary
VTM-2400 Installation and Operation Handbook
123
S-Video
Also Y/C. Transmits luminance and color portions separately via multiple wires, thus
avoiding the color encoding process and resulting loss of picture quality.
Tally
A system used to light lamps and indicate usage. Most production switchers have an
internal tally system to indicate selected functions, and which selected functions are currently
involved with Program.
TCP
Transmission Control Protocol
Telecine
A device used to convert film to video; movie film is digitally sampled and
converted to video frame by frame in real-time.
TCXO
Temperature Compensated Crystal Oscillator
THD
Total Harmonic Distortion
Transport Stream-ATSC (TS)
Consists of the following: (1) Packets: 188 bytes - fixed
length with descriptive data, (2) Carries several programs, (3) has a PID which identifies the
type of TS packet (video, audio, other), and (4) carries descriptive information about the
program.
UHF
Ultra High Frequency
Unity Gain
An electronic term indicating that a signal will be neither amplified or attenuated.
One volt of signal level in results in one volt of signal level out.
Vector
A measure that has two individual properties: magnitude and direction.
Vector Clip
A special encoded clip version that limits only the C
B
and C
R
input video signals
and does not affect (nor is it affected by) the luminance component. This color-only clip limits
the maximum vector excursions as viewed in an encoded state and is intended for users who
wish to prevent encoded vectors from ever exceeding the perimeter circle of an encoded
vector display.
VHF
Very High Frequency
VITC
Vertical Interval Time Code, a method for recording on to video tape the timecode
address for each video frame inserted in the vertical interval.
Waveform
A visual representation of a signal in the shape of a wave that plots amplitude
versus time.
White Level
The brightest part of a video signal, corresponding to approximately 1.0 Volt.
White Balance
An electronic process used to calibrate the picture for accurate color display
in different lighting conditions.
Wipe
A special effect in which two pictures from different video sources are displayed on one
screen. Production switchers and special effects generators provide numerous wipe patterns
varying from simple horizontal and vertical wipes to multi-shaped, multi-colored
arrangements.
XGA
High resolution 1024x768 non-interlaced (progressive) display monitor
XVGA
Extended Video Graphics Adaptor
YP
B
P
R
:
CAV format composed of luminance (Y) and two color difference signals (P
B
and P
R
)
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