Circuit Descriptions, List of Abbreviations, and IC Data Sheets
EN 37L03.2L AA 9.
9.9 Abbreviation List
2CS 2 Carrier Sound
ACI Automatic Channel Installation:
algorithm that installs TV channels
directly from a cable network by
means of a predefined TXT page
ADC Analogue to Digital Converter
AFC Automatic Frequency Control: control
signal used to tune and lock to the
correct frequency
AFT Automatic Fine Tuning
AGC Automatic Gain Control (feedback)
signal to the tuner. This is a circuit with
a constant output amplitude,
regardless of the input
AM Amplitude Modulation
AP Asia Pacific
AR Aspect Ratio: 4 by 3 or 16 by 9
ATS Automatic Tuning System
AV External Audio Video
AVL Automatic Volume Level control
BCL Beam Current Limitater
B/G Monochrome TV system. Sound
carrier distance is 5.5 MHz. B = VHF-
band, G = UHF-band
BTSC Broadcast Television Standard
Committee. Multiplex FM stereo sound
system, originating from the USA and
used e.g. in LATAM and AP-NTSC
countries
CC Closed Captioning; This is a digital
addition to analogue TV signals that
contains textual information relevant
to the TV signal. For NTSC, the
information is transmitted with line 21
and 284 during the Vertical Blank
Interval (VBI)
ComPair Computer aided rePair. A tool for
diagnosing a TV through a PC
controlled interface
CRT Cathode Ray Tube (or picture tube)
CSM Customer Service Mode
CTI Colour Transient Improvement:
manipulation of the steepness of
chroma transients
CVBS Composite Video and Blanking Signal;
A single video signal that contains
luminance, colour, and timing
information
CVI Component Video Input
DAC Digital to Analogue Converter
DBX Dynamic Bass Expander or noise
reduction system in BTSC
D/K Monochrome TV system. Sound
carrier distance is 6.5 MHz. D = VHF-
band, K = UHF=band
DFU Directions For Use: Owner’s manual
DNR Dynamic Noise Reduction; noise
reduction feature of the set
DSP Digital Signal Processing
DST Dealer Service Tool: special remote
control designed for dealers to enter
e.g. service mode (a DST-emulator is
is avaible in ComPair)
DVD Digital Versatile Disc
EEPROM Electrically Erasable and
Programmable Read Only Memory
EHT Extreme High Tension; the voltage
between the cathode and the shadow
mask that accelerates the electrons
towards the screen (around 25 kV)
EHT-INFO Extra High Tension INFOrmation,
used for contrast reduction, vertical
and horizontal amplitude correction,
beam current protection, and flash
detection
EPG Electronic Program Guide; System
used by broadcasters to transmit TV
guide information (= NexTView)
EU Europe
EW East West, related to horizontal
deflection of the set
EXT EXTernal (source), entering the set via
SCART or Cinches
FBL Fast BLanking; DC signal
accompanying RGB signals. To blank
the video signal when it is going from
the right side of the screen to the left
side. The video level is brought down
below the black video level
FILAMENT Filament of CRT
FM Field Memory; A memory chip that is
capable of storing one or more TV
picture fields, or: Frequency
Modulation; A technique that sends
data as frequency variations of a
carrier signal
H H_sync to the module
HP Headphone
I Monochrome TV system. Sound
carrier distance is 6.0 MHz. VHF- and
UHF-band
I
2
C Inter IC bus (also called IIC)
IF Intermediate Frequency
IIC Inter IC bus (also called I
2
C)
ITV Institutional TV
LATAM LATin AMerica
LED Light Emitting Diode; A semiconductor
diode that emits light when a current is
passed through it
L/L' Monochrome TV system. Sound
carrier distance is 6.5 MHz. L' is Band
I, L is all bands except for Band I
LS Loudspeaker
M/N Monochrome TV system. Sound
carrier distance is 4.5 MHz. M= 525
lines @ 60 Hz, N= 625 lines @ 50 Hz
NC Not Connected
NICAM Near Instantaneous Companded
Audio Multiplexing. This is a digital
sound system, mainly used in Europe.
NTSC National Television Standard
Committee. Colour system mainly
used in North America and Japan.
Colour carrier NTSC M/N = 3.579545
MHz, NTSC 4.43 = 4.433619 MHz
(this is a VCR norm, it is not
transmitted off-air)
NVM Non Volatile Memory: IC containing
data such as alignment values, preset
stations
OB Option Bit
OC Open Circuit
OP OPtion Byte
OSD On Screen Display
PAL Phase Alternating Line. Colour system
mainly used in West Europe (colour
carrier = 4.433619 MHz) and South
America (colour carrier PAL M =
3.575612 MHz and PAL N = 3.582056
MHz)
PCB Printed Circuit board (also called PWB
or CBA)
PLL Phase Locked Loop. Used for e.g.
FST tuning systems. The customer
can give in directly the desired
frequency
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