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VIII. Glossary
8PSK
8-PSK is usually the highest order PSK constellation deployed. With more than 8 phases,
the error-rate becomes too high and there are better, though more complex, modulations
available such as quadrature amplitude modulation (QAM). Although any number of
phases may be used, the fact that the constellation must usually deal with binary data
means that the number of symbols is usually a power of 2 — this allows an equal number
of bits-per-symbol.
CAM
Conditional Access Module is an electronic device, usually incorporating a slot for a smart
card, which equips an Integrated Digital Television or set-top box with the appropriate
hardware facility to view conditional access content that has been encrypted using a
conditional access system. They are normally used with direct broadcast satellite (DBS)
services.
Composite Video
Composite video is the format of an analog television (picture only) signal before it
is combined with a sound signal and modulated onto an RF carrier. Composite video
is often designated by the CVBS acronym, meaning "Color, Video, Blank and Sync".
In German (with PAL being a German invention by Telefunken's Walter Bruch) the
abbreviation FBAS (Farbe-Bild-Austastung-Synchron) means the same. It is usually
in standard formats such as NTSC, PAL, and SECAM. It is a composite of three source
signals called Y, U and V (together referred to as YUV) with sync pulses. Y represents
the brightness or luminance of the picture and includes synchronizing pulses, so that
by itself it could be displayed as a monochrome picture. U and V represent hue and
saturation or chrominance; between them they carry the color information. They are rst
modulated on two orthogonal phases of a color carrier signal to form a signal called the
chrominance. Y and UV are then combined. Since Y is a baseband signal and UV has been
mixed with a carrier, this addition is equivalent to frequency-division multiplexing.
Conditional Access
System
Several companies provide competing Conditional Access Systems; Irdeto Access,
Nagravision, Viaccess, Verimatrix and NDS are among the most commonly used CAS
systems.
DiSEqC
Stands for Digital Satellite Equipment Control. It is a special communication protocol for
use between a satellite receiver and a device such as a multi-dish switch or a small dish
antenna rotor. DiSEqC was developed by European satellite provider Eutelsat, which now
acts as the standards agency for the protocol.
EPG
Electronic Program Guide is a digital guide to scheduled broadcast television or radio
programs, typically displayed on-screen with functions allowing a viewer to navigate,
select, and discover content by time, title, channel, genre, etc. by use of their remote
control, a keyboard, or other input devices such as a phone keypad. Content can also
be scheduled for future recording by a personal video recorder (PVR). The on-screen
information may be delivered by a dedicated channel or assembled by the receiving
equipment from information sent by each program channel.
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