Reference Guide: SM6610, SM6615, SM6620 and SM6625 Satellite Modulators
Page A-1
ST.RE.E10152.2
Annex A
A.
Glossary
The following list covers most of the abbreviations, acronyms and terms as used in
TANDBERG Television Limited Manuals. All terms may not be included in this manual.
µ
m Micrometre
(former name - micron)
:
a unit of length equal to one millionth (10
-6
) of a metre.
3:2 pulldown
A technique used when converting film material (which operates at 24 pictures per second) to 525-line video
(operating at 30 pictures per second).
4:2:0
Digital video coding method in which the colour difference signals are sampled on alternate lines at half the
luminance rate.
4:2:2
Digital video coding method in which the colour difference signals are sampled on all lines at half the luminance
rate.
422P@ML
422 Profile at Main Level:
A subset of the MPEG-2 standard, which supports digital video storage (DVD etc.) and
transmissions up to 50 Mbit/s over various mediums. Used for Contribution and Distribution applications.
5B6B
5 Binary Bits Encoded to 6 Binary Bits:
Block code.
AC-3
Audio Coding algorithm number 3 (See Dolby Digital).
ACC
Authorisation Control Computer.
ADPCM
Adaptive Differential Pulse Code Modulation:
An advanced PCM technique that reduces the bit-rate by coding
the difference values between successive samples rather than the absolute value of each sample.
ADT
Audio, Data And Teletext.
AFC
Automatic Frequency Control.
AFS
Automation File Server.
AGC
Automatic Gain Control.
AMOL I and II
Automatic Measure of Line-ups I and II:
Used by automated equipment to measure programme-viewing ratings.
ASI
Asynchronous Serial Interface.
ASIC
Application-Specific Integrated Circuit:
A customised chip designed to perform a specific function.
Async Asynchronous.
ATM
Asynchronous Transfer Mode:
A connection orientated, cell based, data transport technology designed for
Broadband ISDN (B-ISDN). It provides a circuit-switched bandwidth-on-demand carrier system, with the flexibility
of packet switching. It offers low end-to-end delays and (negotiable on call set-up) Quality of Service guarantees.
Asynchronous refers to the sporadic nature of the data being transmitted. Cells are transmitted only when data is
to be sent; therefore the time interval between cells varies according to the availability of data.
ATSC
Advanced Television Standards Committee:
An organisation founded in 1983 to research and develop a digital
TV standard for the U.S.A. In late 1996, the FCC adopted the ATSC standard, the digital counterpart of the NTSC
standard.
