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2.2.2 PLAYBACK PROCESSING
Pre-amp
35
7th pin
The playback ENVELOPE signal from the PRE-AMP is supplied to the 21st pin of SECAM-L IC for
processing the SECAM color, and to 15th pin of A/V IC for processing the PAL color, luminance
respectively.
The output signal through Y/C MIX after each processing of chrominance and luminance is supplied to the
18th pin of OSD IC.
1)LUMINANCE SIGNAL PROCESSING (PLAYBACK)
Pre-amp
15
15
7th pin
26
25
Clamp
LPF
The playback ENVELOPE signal is equalized by the PB-EQ, which flatterns the whole frequency
characteristic. And the PB-EQ is determined by the GROUP , MSB 7-8bits.
Phase compensation part improves The PULSE characteristics.
Double Limiter restores the high frequency portion and eliminates the SPIKE NOISE and AM components.
The signal through Double Limiter is then demodulate, and then the RECORD NONLINER EMPHASIS
characteristic is compensated by DE-EMPAHASIS.
Double High Pass Noise Canceller eliminates the high frequency noise against playback signal.
The picture control circuit improves the picture sharpness, while its characteristic is determined by
Group 8, LSB 1-4 bits.
luminance signal
processing
chrominance signal
processing
PB Enve
Playback Processing
PB-EQ
17
Sub-LPF
FM Demod.
YNR
In L. De-em.
42
5
Luminance Signal Processing (PB)
Y/C mix
Phase Comp.
20
Double Limiter
DHP NC
Y/C Mix
7
40
43
3DQDVRQLF
Video
FBC
amp
OSD IC
18th pin
FM AGC
Pic. Cntl
Y/C Mix
Clamp
38
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