Daewoo DTX-21G2, Руководство по обслуживанию, Страница: 43 / 59

CP-520
V
Service Manual
42
PARAMETER A2/A2* A2+ (KOREA)
Pilot frequency 54.6875kHz = 3.5 x line freq. 55.0699 kHz = 3.5 x line freq.
Stereo identification frequency 117.5 Hz = line freq / 133 149.9 Hz = line freq / 105
Dual indetification frequency 274.1 Hz = line freq / 57 276.0 Hz = line freq / 57
AM modulation depth 50% 50%
2-CARRIERSYSTEMSWITHNICAM
[Table] NICAM standards
SC1
MODULATION
STANDARD FREQUENCY
(MHz)
TYPE
INDEX(%)
NOM./MAX.
DEVIATION
(kHz)
NAM./MAX.
/OVER
SC2
(MHz)
NICA
M
DE-
EMPAHSIS
ROLL-
OFF (%)
NICAM
CODING
B/G 5.5 FM - 27/50/80 5.85 J17 40 Note1
I 6.0 FM - 27/50/80 6.552 J17 100 Note1
D/K 6.5 FM - 27/50/80 5.85 J17 40 Note1
L 6.5 AM 54/100 - 5.85 J17 40 Note1
Note 1. See ‘EBU specification’ or equivalent specification.
5.4 FUNCTIONAL DESCRIPTION SOUND PROCESSOR
5.4.1 The UOC III TV Sound Concept
The UOCIII sound concept is implemented over the video processor and TCG-microcontroller.
Only relevant blocks, functions and signal flows for sound are given.
The tuner receives a RF signal and converts it to IF. Via appropriate SAW filters the SIF signal is
delivered to the QSS stage of the video processor and if channels according to standard L/L’ are
received also to the AM demodulator. The Quasi Split Sound demodulation generates the SSIF
or intercarrier signal. By the SSIF switch it is possible to choose between the internally derived