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Overall Block
There are three main sections in Sony's model KW34HD1 first generation
High Definition Television (HDTV):
1. Video Processing
2. Deflection
3. Power Supply
The additional circuit blocks in each section and the external box needed
to receive the off the air UHF, HDTV signals distinguish this High Definition
TV from a conventional TV.
Video Processing
Because no one HDTV standard has been determined, this first genera-
tion HDTV has the flexibility to accept any of the following inputs:
S o n y m o d e l K W 3 4 H D 1 in p u t s
I n p u t
V H F / U H F a n t e n n a
H D T V e x t e r n a l b o x
D ig it a l c h a n n e ls 1 - 9 9
V H F / U H F a n t e n n a
M a in
v ia a n t e n n a s w it c h
A n a lo g c h a n n e ls 2 - 6 9
C a b le
M a in
v ia a n t e n n a s w it c h
C h a n n e ls 1 - 1 2 5
V id e o 1 – 3
V id e o S e le c t o r S w
P h o n o ja c k s
D V D
D V D S w it c h
P h o n o ja c k s
H D
V id e o P r o c e s s o r
P h o n o ja c k s
The signal path for these inputs is shown below:
Digital Input
VHF/UHF antenna
HDTV Box (accepts all 18 DTV formats)
Video Processor
DTV Sw (twin view or SD picture)
Þ
MID (stores both twin pictures)
ß
RGB Driver
Sel
CRT cathode
Video processor
B lo c k L o c a t io n
S ig n a l f o r m a t
R F
&
S u b
T u n e r s
R F
&
S u b
T u n e r s
R F
C o m p o s it e v id e o ;
L & R c h a n n e l a u d io .
Y , P b , P r
L & R c h a n n e l a u d io
Y , P b , P r
L & R c h a n n e l a u d io
(selects twin pix path)
RGB Driver
Þ
Þ
25
VHF/UHF /Cable Analog Reception
Air or cable selection by the Main Micro is performed at the input antenna
switch (SW). Thereafter the signal path is the same.
VHF/UHF antenna or cable
Input antenna switch (SW)
Main/sub tuners
Video selector
DVD switch
DTV switch
DRC
SEL
Video processor
RGB Driver
CRT cathodes
Video Inputs 1 – 3
Composite video from a VCR or satellite (DSB) receiver
Video selector
DVD switch
DTV switch
DRC
SEL
Video processor
RGB Driver
CRT cathodes
DVD Input
DVD switch
DTV switch
DRC
SEL
CRT
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