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3-2. Key Features of Video IC and Its Relatives
1. LA71511M(QOP 80 PIN) : LUMINANCE-CHROMINANCE AND NORMAL AUDIO SIGNAL PROCESSING IC
1) Applicable to multi system : PAL-GBI, MESECAM, 4.43NTSC, NAP-GBI
2) Built-in NAP circuit to convert NTSC to PAL
3) Normal audio signal processing circuit (self-alignment for record bias)
4) Built-in record and playback FM-EQ function (I
5) Y/C separation using built-in comb filter
6) Built-in switching circuit for 3 video/audio inputs
7) Serial control by I
2
C-bus
8) Complete adjustment free
9) Crosstalk reduction by CCD IC for exclusive use (Color comb filter is unnecessary)
2. LA70011(4CH) : PRE-AMP IC
1) AGC circuit is built-in this IC (no record current adjustment is required)
2) Playback envelope detector circuit is built-in this IC for the purpose of auto-tracking
3. LC89977M : CCD DELAY LINE IC
1) Built-in comb filter function for color noise reduction
2) Built-in 1H delay line for luminance signal
3-3. Record and Playback Processing Circuit
1. RECORD PROCESSING
VIDEO
INPUT
The video input signal selected by the A/V switching IC(KA8119B) among AUX video input, Front video input and IF
video input, is supplied to the 35th pin of A/V 1CHIP IC.
The input video signal is then automatically adjusted to suitable level by the built-in AGC circuit and supplied to SYNC
SEPARATION and FBC(feedback clamp) part respectively.
SYNC signal obtained from the composite video signal by SYN SEP circuit is supplied to the 93rd pin MICOM to
determine the presence of signal and to control the SERVO LOGIC.
In PRE-AMP IC, fir HEAD AMP switching timing on TRICK PLAY and AGC circuit for self-aligning the record bias.
The signal through FBC is then processed in luminance signal processing part and chrominance signal processing
part independently.
8
CIRCUIT
2
C bus control)
PDC IC 13th PIN
35
VIDEO AGC
FIG.1 Record Processing
SYNC SEP
37
LUMINANCE SIGNAL PROCESSING
FBC
CHROMINANCE SIGNAL PROCESSING
MICOM 93rd PIN
PRE-AMP IC 5th PIN
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