Daewoo DUB-2850GB Service Manual page 50

CP-780 Service Manual
* M/BTSC and N standards supported
* M/Japan (EIAJ) supported
* FM Radio stereo decoding
* Alignment-free, fully digital system
* For BTSC full dbx(r) performance
* SAP demodulation (without dbx(r)) simultaneously with stereo decoding, or mono plus SAP
with dbx(r)
* Line/pilot frequency selectable from 15.734 kHz and 15.625 kHz (or automatic detection / auto
search)
* High selectivity for pilot detection, high robustness against high-frequent audio components
* Pilot lock indicator
* SAP detector
* Separate noise detectors for stereo and SAP with adjustable threshold levels, hysteresis, and
automute function
An overview of the supported standards and sound systems and their key parameters is given
in the following tables.
The analogue multi-channel sound systems (A2, A2+ and A2*) are sometimes also named 2CS
(2 carrier systems).
ANALOG 2-CARRIER SYSTEMS
[Table] Frequency modulation
STANDARD SOUND
SYSTEM
M Mono
M
B/G
I Mono
D/K(1)
D/K(2)
D/K(3)
[Table] Identification for A2 systems
PARAMETER
Pilot frequency
Stereo identification frequency
Dual identification frequency 274.1 Hz = line freq / 57
AM modulation depth
CARRIER
FREQUENCY
(MHz)
4.5
A2+ 4.5/4.724
A2 5.5/5.742
6.0
A2* 6.5/6.258
A2* 6.5/6.742
A2* 6.5/5.742
A2/A2*
54.6875kHz = 3.5 x line freq.
117.5 Hz = line freq / 133
50%
FM DEVIATION(kHz)
NOM./MAX./OVER
15/25/50
15/25/50
27/50/80
27/50/80
27/50/80
27/50/80
27/50/80
-50-
MODULATION BANDWIDTH/
DE-EMPHASIS
SC1 SC2
Mono -
1/2(L+R) 1/2(L+R) 15/75(Korea)
1/2(L+R) R
mono -
1/2(L+R) R
1/2(L+R) R
1/2(L+R) R
A2+ (KOREA)
55.0699 kHz = 3.5 x line freq.
149.9 Hz = line freq / 105
276.0 Hz = line freq / 57
50%
(kHz/us)
15/75
15/50
15/50
15/50
15/50
15/50