PRORXD Broadcast Receiver User Guide
Commercial in Confidence
Broadcast Solutions, HD/SD Products,
PRORXD
100167
Revision: 7.0
Commercial in Confidence
Page 10-91
10.
Appendix C – Glossary
10.1
Glossary
0-9
Means…
16QAM
16-state Quadrature Amplitude Modulation.
64QAM
64-state Quadrature Amplitude Modulation.
A
Means…
AC
Alternating Current. Current that is continually changing in magnitude and
at intervals in direction from a zero reference level.
A/V
Audio/Video.
AES
In cryptography, the Advanced Encryption Standard (AES) is an encryption
standard adopted by the U.S. government. The standard comprises three
block ciphers, AES-128, AES-192 and AES-256, adopted from a larger
collection originally published as Rijndael. Each AES cipher has a 128-bit
block, with keys of 128, 192 and 256 bits, respectively.
ASI
Asynchronous Serial Interface. A streaming data interface which often
carries an MPEG Transport Stream.
An ASI signal can carry one or multiple SD, HD or audio programs that are
already compressed, not like an uncompressed SD-SDI (270Mbs) or HD-SDI
(1.45Gbs). An ASI signal can carry differing quantities of data but is always
padded to operate at a fixed line rate of 270 Mb/s.
Amplification
Increasing the strength (current, voltage or power) of a signal.
Amplitude
The level of an audio or other signal in voltage or current. The magnitude of
variation in a changing quantity from its zero value.
Amplitude Modulation
Modulation in which the amplitude of the carrier wave is varied above and
below its usual value in accordance with the intelligence of the signal being
transmitted. Also called AM.
Analogue
Analog transmission is a transmission method of conveying voice, data,
image, signal or video information with a continuous signal which varies in
amplitude, phase, or some other property in proportion to that of a variable.
Antenna
An antenna (or aerial) is a transducer designed to radiate or receive
electromagnetic energy (generally RF).
Antenna Bandwidth
The frequency range over which a given antenna will accept signals.
Antenna Gain
The effectiveness of a directional antenna as compared to a standard non-
directional antenna. It is usually expressed as the ratio in decibels of
standard antenna input power to directional antenna input power that will
make the same field strength in the wanted direction. For a receiving
antenna, the ratio of signal power values produced at the receiver input
terminals is used. The more directional an antenna is, the higher is its gain.
