Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.
9.4
Abbreviation List
2CS
2 Carrier Sound. Analog stereo sound
system used, e.g., in Germany.
4.43
NTSC 4.43; Sound carrier is on 5.5
MHz.
A/V
Audio / Video. Video is CVBS.
ADC
Analogue to digital converter
ADE
Scaler chip manufacturer
AFC
Automatic Frequency Control.
AGC
Automatic Gain Control: algorithm that
controls the video input of the feature
box
AM
Amplitude Modulation.
B/G
Monochrome TV system. Sound
carrier = 5.5 MHz. Also system H
(Belgium) is included.
Black Stretch
The lowest value of the video signal is
measured during the scanning time.
The black stretch shifts this level to the
nominal black level within limits.
BLR
Board Level Repair
BTSC
Broadcast Television Systems
Committee. Multiplex FM stereo sound
system. Originating from USA and
used, e.g., in LATAM and AP-NTSC
countries.
CLR
Component Level Repair
CVBS
Composite Video Blanking and
Synchronization
CVI
Component Video Input
D/K
Monochrome TV system. Sound
carrier = 6.5 MHz.
DAC
Digital to analogue converter
EEPROM
Electrically Erasable and
Programmable Read Only Memory
EW
East West, related to horizontal
deflection of the set
EXT
External (source), entering the set via
SCART or Cinch. Can either be Ext.1
or Ext.3
FM
Frequency Modulation.
HD-MAC
Early European broadcasting
standard for high-definition television,
proposed in the late sixties and
abandoned in 1993.
I
Monochrome TV system. Sound
carrier = 6.0 MHz.
I2C
Integrated IC bus
I.F.
Intermediate Frequency
LED
Light Emitting Diode.
L/L'
Monochrome TV system, Sound
carrier = 6.5 MHz (France), L' is Band
I, L is all bands except for Band I
LS
Loudspeaker
M/N
Monochrome TV system. Sound
carrier = 4.5 MHz.
MCU
Main Control Unit
NC
Not Connected
NICAM
Near Instantaneous Compounded
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
TV related data e.g. alignments
OC
Open Circuit
OSD
On Screen Display
PAL
Phase Alternate Line. Colour system
used mainly in Western Europe (PAL
= 4.43361875 MHz) and South
America. (PAL M = 3.57561175 MHz;
PAL N = 3.58205625 MHz).
PB
Play Back. Some colour systems
cannot be received on air. The sound
carrier is on a different frequency.
However via External (PB) the sound
is offered in base-band, so via Ext. the
picture and sound are O.K.
PCB
Printed Circuit board
PFC
Power Factor Correction
PLL
Phase Locked Loop. Used for e.g.
FST tuning systems. The customer
can give directly the desired
frequency.
QSS
Quasi Split Sound. Sound IF
application used for stereo sound.
RAM
Random Access Memory
RC
Remote Control handset
RC5
Remote Control code standard.
RGB
Red, Green, and Blue video signals
ROM
Read Only Memory
S/C
Short Circuit
Scart
Peri television interconnection 42-pin
or 21-pin euro connector
SCL
Serial Clock
SECAM
Colour system used e.g. in France.
Colour carriers: F0R = 4.40625 MHz;
F0B = 4.25000 MHz
SIF
Sound Intermediate Frequency
SRGB
A Standard RGB (Red Green Blue)
colour space, created by Hewlett-
Packard and MicroSoft.
TBF
To Be Fixed.
Tint
By the user selectable white tones for
different colour temperatures.
TXT
Teletext.
UOC
Ultimate-One-Chip; all important
functions in one package.
uP
Microprocessor.
XTAL
Quartz crystal.
YC
Luminance (Y) and Chrominance (C)
signal.
