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Acronym for Thin Film Transistor; technology used with
LCD screens, also known as Active Matrix.
The transmission bit rate of 1.544 millions bits per
second. This is also equivalent to the ISDN Primary
Rate Interface for the U.S. The European T1 or E1 transmission
rate is 2.048 million bits per second.
A standard for audio-graphics exchange. While H.320
does provide a basic means of graphics transfer, T.
120 will support higher resolutions, pointing and annotation.
Users can share and manipulate information much as they
would employ if they were in the same room though they
are working over distance and using a PC platform. T.
120 will allow audio bridge manufacturers to add graphics
to their products in support of a wide range of applications.
This type of image is fairly easy to capture with compressed
video because there is very little motion in a talking
head image and most occurs in facial expression and
In North America, a digital channel which communicates
at 45.304 Mbps.
Image File Format
Graphics format used primarily for scanned images that
are generally not incorporated into the host document
but instead are "tagged" for printing when
the host document is printed.
For Time-Base corrector; a device used to stableize
and synchronize multiple video signals, as in a video
studio where the output of a videotape recorder must
be dissolved to a live on-camera shot.
Time division multiple access. Refers to a form of multiple
access where a single carrier is the shared by many
users. Signals from earth stations reaching the videoconference
consecutively are processed in time segments without
Generic term for telephone company. Can refer to an
Interexchange Carrier or to the Local Exchange Carrier.
An electronic method of transmitting information from
one location to another over a telephone network.
A meeting of geographically separated people who may
have two-way audio, video, and text communications often
via telephone and/or closed-circuit television.
The technical equipment and events involved in creating
television productions. The picture portion of a television
A device typically having a keyboard and display that
is capable of sending text to and receiving text from
another device, a network, etc.
A load, or impedance at the end of a cable or signal
line used to match the impedance of the equipment that
generated the signal. The impedance absorbs signal energy
to prevent signal reflections from going back toward
the source. In the video industry, termination impedance
is typically 75 ohms.
A device that provides termination for a signal line,
or several signal lines, at the end of a cable. Usually
a close-tolerance resistor for each signal, a terminator
is often mounted in its own connector making it easy
See Signal Generator.
Acronym for Thin Film Transistor.
The distance from projector lens to screen.
A technology used to make Active Matrix LCD
panels wherein each pixel has its own transistor switch.
See "Active Matrix".
Acronym for Tagged Image File Format.
VTR playback circuitry used to smooth out the wavering
edges of a video image.
Slight errors in the line-to-line position of video
information which occur between recording and playback.
At the time of playback, these appear as serrations,
tending to make the edges of the image waver.
A sync generator which puts a clock signal on the video
tape to refer to for precise horizontal lock-up of an
A digital or binary code used to label each frame of
a video signal. This is very useful for editing the
video since the time code is in the form of hours, minutes,
seconds and frames.
See "hue", A relative measure of the amount
of white in a given color.
To switch over to an alternate state - from on to off,
An electronically charged circuit holding either of
two states - on or off, for example. The state does
not change until the circuit is directed to the alternate
A control panel with a flat surface (usually marked
off) that functions as switches or controls. May also
be called "touch screen".
A display screen that acts as an input device by responding
to the touch of the user.
The visible shapes drawn on a CRT
by the movement of the electron beam. Trace lines are
also known as video lines on a CRT.
A device that converts a specific physical quantity
such as sound, pressure, strain, or light intensity
into an electrical signal.
to Transistor Logic
Digital type signal, usually 4-5 volts peak-to-peak.
Distance limitation is 6-10 feet. Signal splitting is
acceptable. TTL signals are either "ON" or
"OFF" and is characteristic of low resolution
A type of overhead projector that has its light source
in the base of the unit rather than in the upper lens
housing (as in a reflective overhead projector).
An electronic device consisting of oscillator, modulator
and other circuits, which produce a radio or television
electromagnetic wave, signal for radiation into the
atmosphere by an antenna.
Reliable and effifient end-to-end transport service
between user process.
The circuit that initiates a horizontal sweep on an
oscilloscope and determines the beginning point of the
Super Twist Nematic
Color LCD technology which involves
stacking 3 monochrome LCD's (cyan,
magenta, yellow), using a subtractive color process
involving gray scale algorithms to produce a full spectrum
of colors. (Triple Super Twist Nematic).
Acronym for Tripple Super Twist Nematic.
Acronym for Transistor to Transistor Logic.
To adjust or fine-tune.
A tiny screwdriver for making sensitive adjustments
to audio visual and computer equipment.