Philips 32PF9968/10 Service Manual page 86

EN 86 9.
– Bit 0: OP_HUE,
• Option Byte 6
– Bit 7: OP_PERSONAL_ZAPPING,
– Bit 6:
– Bit 5: OP_FMTRAP
– Bit 4: OP_COMBFILTER
– Bit 3: OP_ACTIVE_CONTROL
– Bit 2: OP_VIDEO_TEXT
– Bit 1 :OP_LIGHT_SENSOR,
– Bit 0: OP_DUAL_TEXT
For more details on the option settings, please refer to the
chapter 8 "Alignments".
9.7.4 2fh video Processing
The DPTV SVP is a video processor for a wide range of
applications. In this application it functions as scan rate
converter. It can handle the standard video display source(1fH)
of either CVBS or YPbPr and High definition video display
source of 1920/1080i in 2fH. The scan rate conversion from 1fH
to 2fH in interlace or progressive scanning format is performed
at the scaling part of SVP chip. The SVP also perform NTSC/
PAL/SECAM video decoding function, but this is not used.
Basically, 3 output display format has been selected to match
with our 31.25/31.50 KHz CRT deflection system design. There
are 1080i/50Hz,625i/100Hz and 480p/60Hz
9.7.5 OSD Insertion
Since this is a 2fh chasis the OSD is inserted at the TDA9332
(HOP). For this a seperate OSD generator is used the
MTV030. It is a I2C controlled device and is suitable for line
frequencies upto 150KHz.
9.8 Audio Processing
The audio decoding is done entirely via the Hercules. The IF
output from the Tuner is fed directly to either the Video-IF or the
Sound-IF input depending on the type of concept chosen.
There are mainly two types of decoder in the Hercules, an
analog decoder that decodes only Mono, regardless of any
standards, and a digital decoder (or DEMDEC) that can decode
both Mono as well as Stereo, again regardless of any
standards.
In this chassis, the analog decoder is used in two cases:
• It is used for AM Sound demodulation in the Europe
SECAM LL' transmission.
• It is used for all FM demodulation in AP AV-Stereo sets.
9.8.1 Diversity
The diversity for the Audio decoding can be broken up into two
main concepts:
• The Quasi Split Sound concept used in Europe and some
AP sets.
• The Inter Carrier concept, used in NAFTA and LATAM.
The UOC-III family makes no difference anymore between
QSS- and Intercarrier IF, nearly all types are software-
switchable between the two SAW-filter constructions.
Simple data settings are required for the set to determine
whether it is using the Inter Carrier or the QSS concept. These
settings are done via the "QSS" and "FMI" bit found in SAM
mode. Due to the diversity involved, the data for the 2 bits are
being placed in the NVM location and it is required to write once
during startup.
Since this is a China only chassis the AP sound systems will be
discussed.
For AP, the standard consists of BG/DK/I/M for a Multi-System
set. The diversity here will then depends on the region. AP
L04A AD Circuit Descriptions, Abbreviation List, and IC Data Sheets
China can have a Multi-System and I/DK version. For India, it
might only be BG standard.
9.8.2 Functionality
The features available in the Hercules are as follows:
• Treble and Bass Control.
• Surround Sound Effect that includes:
– Incredible Stereo.
– Incredible Mono.
– 3D Sound (not for AV Stereo).
– TruSurround (not for AV Stereo).
– Virtual Dolby Surround, VDS422 (not for AV Stereo).
– Virtual Dolby Surround, VDS423 (not for AV Stereo).
– Dolby Pro-Logic (not for AV Stereo).
• Bass Feature that includes:
– Dynamic Ultra-Bass.
– Dynamic Bass Enhancement.
– BBE (not for AV Stereo).
• Auto-Volume Leveler.
• 5 Band Equalizer.
• Loudness Control.
All the features stated are available for the Full Stereo versions
and limited features for the AV Stereo
9.8.3 Audio Amplifier
The audio amplifier part is very straightforward. It uses the
integrated power amplifier TDA2616Q, and delivers a
maximum output of 2 x 10 W_rms.
The maximum operating condition for this amplifier is 21 V
unloaded. Normal operating supply is from 7.5 V to 16 V.
Muting is done via the VOLUME_MUTE line connected to pin
2 of the amplifier-IC and coming from the UOC.
The following table shows pin functionality of the Audio
Amplifier:
Table 9-9 Pinning overview TDA2616
Pin Pin Name
1 Input Left
2 Mute
3 Ground
4 Output L Channel
5 Supply Voltage (negative)
6 Output R Channel
7 Supply Voltage (positive)
8 Inverting inputs L and R
9 Input Right
9.9 Picture in Picture (PIP)
The PIP application has two tuners, one with a splitter on the
main chassis and another with "phono" input on the PIP panel.
The same signal is injected to both tuners, so that it does not
need separate auto tuning for the PIP tuner.
The TDA9887TS (item 7201) is an alignment free multi-
standard vision and sound IF signal PLL demodulator for
positive and negative modulation, including sound AM and FM
processing.
The SDA9489 (item 7242) is a multi system color decoder with
many features such as: half screen size PIP, selectable YUV or
YPbPr, 16:9 application, WSS detection, Closed Caption, and
OSD display for PIP window etc.
The PIP power supply is based on the step down converter
principle. The +9V input voltage is converted to +5V and +3.3V
via the regulator (item 7501).
Normal Operation
Input AC signal
16 V_dc
0 V
AC waveform
-16 V_dc
AC waveform
+ 16 V_dc
0 V
Input AC signal