Hitachi 51F510, Руководство пользователя

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DP-4X COMPOSITE VIDEO SIGNAL PATH - 1H NTSC EXPLANATION
PAGE 03-05
(Continued from page 04-04)
PIN 60 SUB (PinP) 1H NTSC VIDEO SIGNAL FLOW.
The Composite Video signal is output via pin 60 . Then through Q403 to the following buffers; QV06 and
QV07
. From here it splits into two paths;
1. To OV10 and into the Microprocessor Sync Path where the composite Sync is used by the Micro-
processor I004 for Station Detection and V. Chip data stripping.
2. And to QV09 and QV08 .
From
QV08
the composite signal is input to the
2-Line
comb filter IC
IV04
pin
4
.
2-Line Inputs and Outputs:
The 2-Line comb filter separates the Luminance (Y) Signal and the Chrominance (C) signal.
1. Luminance: The Y signal is output from pin 15 . Then to QV19 , XV08 which eliminates an high
frequencies that are incorporated into the signal by the
2-Line
comb filter and any phase errors that
may have been generated. Then to QV35 and QV39 to IV09 pin 6 .
IV09 Sub Y Selector:
Dependant upon the customer’s selection Pin
60
of
I401
outputs either S-Y 3, 4 or 5 inputs. This
signal is routed through Q403 . Then its received by IV09 pin 4 and dependant upon the customer’s
selection outputs on pin 2 either Y from the 2-Line Comb Filter input on pin 6 or Y from the S-
Inputs input on pin 4 .
2.
Chrominance:
The
C
signal is output from pin
13
. Then to
QV30
,
XV09
which eliminates an high
frequencies that are incorporated into the signal by the 2-Line comb filter circuit. Then to QV36 ,
and QV38 to IV10 pin 6 .
IV10 Sub C Selector:
Dependant upon the customer’s selection Pin 59 of I401 outputs either S-C 3, 4 or 5 inputs. This
signal is routed through Q405 . Then its received by IV10 pin 4 and dependant upon the customer’s
selection outputs on pin 2 either C from the Comb Filter input on pin 6 or C from the S-Inputs input
on pin
4
.
IV12 Sub 1H Video/Chroma:
The Y signal arrives at IV12 pin 40 of the Sub 1H Video/Chroma IC.
The C signal arrives at IV12 pin 6 of the Sub 1H Video/Chroma IC.
This IC takes the Y and C separate 1H NTSC signals and converts them to Y Cr/Cb components
which are the appropriate signal format for the next IC,
I501 which is the Sub Y Pr/Pb Selector.
The outputs from
IV12
are
Y
pin
37
,
Cr
pin
48
and
Cb
pin
47
.
I502 Sub Y Pr/Pb Inputs : Receives the following 3 types of Inputs;
1. 1H NTSC: The outputs from IV12 are received by I501 , Y pin 66 , Cr pin 70 and Cb pin 68 .
2. Component 1 or 2, HDMI Inputs: I501 receives the Component 1 or 2 and/or HDMI 1 or 2
inputs at the following pins,
Y
pin
78
,
Pr
pin
2
and
Pb
pin
80
.
3. ATSC (Digital Tuner) Inputs: I501 receives the Digital Tuner (1080i) inputs at the following
pins, Y pin 72 , Pr pin 76 and Pb pin 74 .
I501 Sub Y Pr/Pb Outputs
:
Dependant upon the Customer’s selection for the Main Picture, I501 outputs the component signals
on the following pins; Y pin 20 , Pr pin 16 and Pb pin 18 .
The Signals Continue on the RGB Processor Circuit Diagram.