9
CIRCUIT
1) LUMINANCE SIGNAL PROCESSING (RECORD)
The input signal through FBC is reduced a half(-6dB) of its level and then the pure luminance signal is obtained by
LPF. In YNR(luminance noise reduction) circuit, noise is eliminated using the original signal and the 1H delayed
signal.
The DETAIL ENHANCER enhances the overall high-frequency response, so an object with fine lines (such as a lawn,
hair etc.) can be seen more clearly during PLAYBACK.
The NONLINEAR EMPHASIS and MAIN EMPHASIS can minimize the triangular noise susceptible to frequency
modulation.
The luminance signal is FM-modulated and then is supplied to RECORD EQUALIZER for compensating the high
frequency response related to HEAD characteristic, where its RECORD EQ is determined by the GROUP 4, LSB 1-4
bits of I
2
C serial control.
2) CHROMINANCE SIGNAL PROCESSING (RECORD)
The pure chrominance signal is obtained by BPF1 (fsc : 4.43MHz), which filters the input signal through FBC.
The gain of ACC AMP is controlled by the DC voltage at 13th pin.
The main converter down-converts the chrominance signal with signal carrier of 4.43MHz to the signal with signal
carrier of 627KHz.
The down-converted signal is again filtered by the LPF, so the pure chrominance component is maintained.
Meanwhile, the burst level of the ACC AMP output signal is detected by the burst gate, and it determines the
activation of color killer.
18
40
5
42
25
26
7
400nS
DELAY FILTER
(LC89977M)
PRE-AMP 9th PIN
CLAMP
1H DELAY
FBC
1/2
LPF
YNR
REC EQ
FM MOD
MAIN
EMPHASIS
DETAIL
ENHANCER
N.L.
EMPHASIS
CLAMP
FIG.2 Luminance Signal Processing (RECORD)
14
13
FBC
BPF 1
ACC
AMP
MAIN
CONV
C-LPF
KIL
PRE-AMP 10th PIN
REC
DET
REC
BGA
FIG.3 Chrominance Signal Processing (RECORD)
Содержание DV-K82 series
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