Philips 42PF9945 Service Manual page 45

EN 104 9.
Auto TV
The Auto Picture Control or in short AutoTV, aims at providing
the customer the best possible picture performance at any
time. Therefore, it performs real time processing of the video
signal and because of that, it decides to adapt several video
parameters throughout the whole chassis. The total effect of
Auto Picture Control on the screen can be selected by the use
of the remote control. The commercial name for the feature is
"Active Control".
The sets have three digital options: Progressive Scan, Pixel
Plus, and Movie Plus. The Progressive Scan mode has no
Pixel Plus enhancement. For 2fH inputs, only Progressive
Scan or Pixel Plus mode can be selected. For 3fH inputs no
digital options are available.
The aim of Movie Plus mode is to reduce the Halo artefacts
(halo's are artefacts introduced with the Natural Motion
feature). Reducing halo's will result in motion judder. This is
compensated by the FBX software.
The basic component for Auto TV is the FBX. It measures the
picture content and it has the most video control parameters on
board, like peaking, coring, DNR, and so on. With the presence
of the Eagle, additionally the colour enhancement functions
and the LTI are controlled. Also, the light sensor, needed for
ambient light control, is supported via the OTC. Finally, vertical
peaking is mostly done in Eagle, a little in the PICNIC, and the
motion compensation and DNR is done in the FALCONIC.
See also EM5 service manual.
9.6
Audio
9.6.1
Introduction
In this chassis, there are only Virtual Dolby sets, but there is
diversity between Europe and USA sets.
9.6.2
Audio decoding
Two audio decoders will be used:
•
ITT MSP 3411: for Europe sets.
•
ITT MSP 3421: for USA sets.
Both MSP versions also decode NICAM. The AM signal is also
decoded by the MSP.
9.6.3
Audio source selecting
AUDIO BLOC K DIAGRAM EUROPE
MAIN IN
TEA6422D
1 2 3
0X98
AV5(Ypbpr) 6
Side/VGA 5
SIF/AM
SC4 4
SC3 3
SC2 2
SC1 1
C in
MAIN HIP
Figure 9-7 Audio block diagram
The MSP covers a SIF input, 4 stereo inputs and one mono
input. As this chassis needs more inputs, one matrix IC
(TEA6422D, item 7I17) is added. The stereo inputs on this IC
are:
•
For Europe:
–
EXT1.
–
EXT2.
–
EXT3.
–
AV5 (YPbPr 2fH/3fH).
–
AV6 (VGA).
FTP1.1E Circuit Descriptions, Abbreviation List, and IC Data Sheets
I2S
1S01
MSP3411
ENC
DE
C
L/R LS
DEC
SC1
MON OUT
SC2
SC3
REG-SW
SC4
AUX OUT
NSM4556
Headphone
CL 36532053_077.eps
•
For USA:
–
–
–
–
There are three separated outputs on the matrix IC, but only the
main output (MAIN_IN), going to the MSP, is used.
The MSP has the following inputs:
•
SIF input (this can be FM, AM, or NICAM).
•
MAIN_IN from matrix IC TEA6422D.
•
Centre input.
An S/PDIF in/output is not foreseen.
9.6.4
Audio processing
European sets have an MSP3411, USA sets have an
MSP3421. Both can handle Virtual Dolby. All sets have 2 x 10
W_rms output.
Following outputs are foreseen:
•
Europe:
–
–
–
–
•
USA:
–
–
Important remarks
•
For Europe: Régimbeau switch (REG_SW): this switch
(item 7I20) is needed to prevent feedback (Larsen effect).
When EXT2 is chosen as incoming signal, the output of
EXT2 following the main picture, is also EXT2. This will
cause the Larsen effect. To prevent this, the record select
must be switched to tuner. This is especially important
when decoders are used (e.g. Canal + decoder) behind a
"transparent" VCR connected to EXT2.
•
It is not allowed to mix up analogue and digital signals in
the MSP; SCART-in towards SCART-out should be treated
in the analogue source select part of the MSP. Reason for
this, is the limited bandwidth in the MSP (16 kHz) while the
analogue source selection part can carry up to 20 kHz.
•
If a 2fH/3fH source is selected, it is not possible to handle
the video signal in the 1fH source selection. Since the
video signal cannot be connected to EXT2, the output of
EXT2 is switched to FRONTEND, and MONITOR OUT is
WYSIWYR (same source as video).
FTV lipsync
delay
SCART 1
SCART 2
MON OUT
FRONT OUT
181103
AV1.
AV2.
AV4 (YPbPr 1fH or 2fH/3fH).
AV5 (DVI).
EXT1: Front-end
EXT2: WYSIWYR.
Monitor out: for external Dolby ProLogic amplifier.
Headphone out.
Monitor out: Front-end.
Headphone out.