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BISS
Bit rate
Block; Pixel Block
Bouquet
B-Picture; B-Frame
BPSK
Buffer
BW
Byte-mode
CA
CAT
C-Band
CCIR
CCITT
Channel
EN/LZT 790 0005 R7A
Basic Interoperable Scrambling System: Non-proprietary encryption
from EBU (Tech3290).
The rate of transfer of digital data when the data comprises two logic
states, 1 and 0. Measured in bit/s.
An 8-row by 8-column matrix of luminance sample values, or 64
DCT coefficients (source, quantized, or de-quantized).
A collection of services (TV, radio, and data, or any combination of
the three) grouped and sold together, and identified in the SI as a
group. A single service may be in several bouquets.
Bi-directionally Predictive Coded Picture/Frame: A picture that is
coded using motion-compensated prediction from previous I or P
frames (forward prediction) and/or future I or P frames (backward
prediction). B frames are not used in any prediction.
Binary Phase Shift Keying: A data modulation technique.
A memory store used to provide a consistent rate of data flow.
Bandwidth: The transmission capacity of an electronic line such as
(among others) a communications network, computer bus, or
broadcast link. It is expressed in bits per second, bytes per second
or in Hertz (cycles per second). When expressed in Hertz, the
frequency may be a greater number than the actual bits per second,
because the bandwidth is the difference between the lowest and
highest frequencies transmitted. High bandwidth allows fast
transmission or high-volume transmission.
Each byte is delivered separately in the ASI transport stream, with
stuffing data added between the Bytes to increase the data rate to
270 Mbps. See DVB Document A010 rev. 1, Section B3.3, (ASI)
Layer-2 Transport Protocol.
Conditional Access: The technology used to control the access to
viewing services to authorized subscribers through the transmission
of encrypted signals and the programmable regulation of their
decryption by a system such as viewing cards.
Conditional Access Table: Part of the MPEG-2 Program Specific
Information (PSI) data. Mandatory for MPEG-2 compliance if CA is
in use.
The portion of the electromagnetic spectrum, which spans the
frequency range of approximately 4 GHz to 6 GHz. Used by
communications satellites. Preferred in tropical climates because it
is not susceptible to fading.
See: ITU-R.
See: ITU-T.
a narrow range of frequencies, part of a frequency band, for the
transmission of radio and television signals without interference from
other channels.
In the case of OFDM, a large number of carriers spaced apart at
precise frequencies are allocated to a channel.
Glossary
A-3
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