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Video Block 1
Input Formats
This direct view 34" model KW34HD1 High Definition TV can accept vari-
ous formats and present them in a single or double Twin View
To perform this, each input signal must be processed into a common for-
mat, then selected for viewing. The inputs are:
S o n y M o d e l K W 3 4 H D 1 I n p u t s
I n p u t
F o r m a t
N T S C a n a lo g
R F
V H F / U H F
c h a n n e ls 2 - 6 9
C a b le ( a n a lo g )
R F
c h a n n e ls 1 - 1 2 5
V id e o 1 – 3
C o m p o s it e v id e o
L & R a u d io
D V D
C o m p o n e n t
v id e o
L & R a u d io
H D
S a m e a s a b o v e
Signal Flow
RF Input
The RF signals input to the main and sub tuners are channel selected and
RF demodulated into composite video. The composite video from the
tuner is applied to the video Switch IC2006 along with composite videos 1-
3 from the rear and front panel for user selection.
Video Inputs
Video Switch IC2006 selects the video for the main and sub pictures. It
also sends the video through comb filters. The comb filters separate the
composite video into their luminance (Y) and chroma (C) parts.
picture.
Ò
P r o c e s s in g
D e m o d u la t io n in t o v id e o .
V id e o in t o Y & C .
Y & C in t o c o m p o n e n t v id e o ( Y ,
C b , C r . )
C o m p o n e n t v id e o in t o R G B
S a m e a s a b o v e e x c e p t d if f e r e n t
R F f r e q u e n c ie s a r e r e c e iv e d .
V id e o in t o Y & C .
Y & C in t o c o m p o n e n t v id e o ( Y ,
C b , C r . )
C o m p o n e n t v id e o in t o R G B
C o m p o n e n t v id e o in t o R G B .
C o m p o n e n t v id e o in t o R G B
29
The main and sub (Y & C) outputs run parallel paths through similar ICs
before leaving the A board. The main and sub signals are converted to
component video in Chroma Decoders IC2403 (sub path) and IC2404 (main
path). The Y, R-y, B-Y signals are applied to switches IC2405 and IC2406
to enable DVD input selection.
DVD Input
Switches IC2405 and IC2406 can now select between the processed com-
posite video signal and the rear panel DVD input. The DVD signal must
also be applied to the sub input line so that it can appear as the second or
sub picture in the Twin View mode. Whatever is input on the main picture
path is duplicated in the sub path. Switch selection is performed using
serial data from the Main Micro IC3251 (not shown). The switched signal
is applied to the next switch in both signal paths.
DTV Input
Switches IC2407 and IC2408 introduce the digital TV from the external
setback box. This DTV signal path is used when:
· Viewing the HD or SD Digital TV signal as a sub picture (Twin View
mode); or
· The DTV signal is of standard definition (525 lines/480 lines viewable)
and line doubling is required.
When viewing just the single HDTV picture, the DTV signal is applied di-
rectly into the video processor IC3005 (Video Block 3) and does not come
this way (except during Twin View).
A Board Output
The main and sub picture paths leave the A board and are passed through
the G board into the digital processing stages on the V board. This signal
routing through the G board is necessary because both the vertical A and
V boards plug into the horizontal G board.
Ò
Sony, Trinitron, and Twin View are registered trademarks of Sony.
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