Table:
An MPEG structure that can be updated in sections and which can contain any of a variety of data
Thermal Noise:
Random, undesired electrical signals caused by molecular motion, known more familiarly as noise.
Time-Shifted Event:
The same program broadcast on two or more channels, each broadcast starting a fixed period of time after the previous one. This is mainly intended for PPV. For example, the same movie can be started on nine different channels, each delay 10 minutes from the previous one. A subscriber then has to wait a maximum of 10 minutes for the start of this movie. The fact that the same movie is transmitted more tha
Trace:
The movement of the electron beam from left to right on a television screen. n once is usually transparent to the subscriber.
Threshold:
A minimal signal to noise input required to allow a satellite receiver to deliver an acceptable picture.
Transponder:
One circuit on a satellite that receives, modulates, amplifiers and re-transmits an uplinked signal
Transport Stream:
An MPEG-2 multiplex with short, fixed-length packets carrying many programs intended for general broadcast over potentially error-prone media, such as a satellite broadcast.
Trap:
An electronic device that attenuates a selected band of frequencies in a signal. Also known as a notch filter.
UART:
Short for Universal Asynchronous Receiver-Transmitter. The UART is a computer component that handles asynchronous serial communication. Every computer contains a UART to manage the serial ports.
UHF:
Ultrahigh frequencies ranging from 300 to 3,000 MHz. North American TV channels 14 through 83. African and European TV channels 21 to 69.
Upconverter:
A device that increases the frequency of a transmitted signal.
Uplink:
The earth station electronics and antenna which transmit information to a communication satellite.
Vertical Blanking Pulse:
A pulse used during the vertical retrace period at the end of each scanning field to extinguish illumination from the electron beam.
Vertical Sync Pulse:
A series of pulses which occur during the vertical blanking interval to synchronize the scanning process at the television with that created at the studio. See also Serrated Vertical Pulse
VHF:
Very high frequencies. The lower frequency range for terrestrial television broadcasts.
Viaccess:
A coding system which is gaining increased popularity among providers lately. Viaccess is widely used in France and by several providers in the north east of Europe. It is a relative newcomer.
Videoguard:
A coding system that is used by English based Sky Television mainly.
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