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DP-4X COMPOSITE VIDEO SIGNAL PATH - 1H NTSC EXPLANATION
(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.
PAGE 03-05
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