Philips EM6E Service Manual Download

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Circuit Descriptions, Abbreviation List, and IC Data Sheets

Processing
The MUPPET IC (SAB9081, item 7PA6) is a multi-standard
PIP controller, which can be used in Double Window or PIP
applications.
The main picture YUV is fed to pins 98, 2, and 100, while the
sub picture YUV is fed to pins 83, 79, and 81.
These signals are mainly used during the DW mode. In PIP
mode, the signals are inserted into the main picture with
reduced size.

Inside the MUPPET, the conversion to the digital environment
is done with ADCs. Processing and storage (1 MB DRAM) of
the video data is done entirely in the digital domain. The
conversion back to the analogue domain is done by DACs.
Internal clocks are generated by PLLs, which lock on to the
applied horizontal and vertical syncs from the main and sub
pictures. The main picture syncs are applied to pin 70 (V) and
pin 94 (H) and the sub picture syncs are applied to pin 72 (V)
and pin 87 (H).
For DW mode, the main picture is compressed horizontally by
a factor of two and fed directly to the output. After compression,
a horizontal expansion of two is possible for the main picture.
The sub picture is also compressed horizontally by a factor of
two but stored in memory before it is fed to the outputs.

Figure 9-8 DW/PIP operation

[A] In normal mode (no DW or PIP), the YUV_MAIN signal is
connected to switch 7P54, which is directly connected to the
FBX (the switch is not activated).

[B] In case of DW, both signals, main YUV signal and sub YUV
are added in de Muppet and via switch 7P54 routed to the FBX.
In DW mode the switch is forced to send the signal from the
Muppet (and not the main YUV). This to avoid that in squeezed
mode instead of the black bars a part of the main signal should
be visible.

[C] In case of PIP, the YUV_MAIN signal is connected to the
switch (will be the "main" picture). Via the switch, the signal is
connected to the FBX.

At the moment the PIP-info has to be written into the main
picture, the switch is connected to the YUV-muppet signal
(contents = YUV-sub signal). The switching is controlled by the
FBL signal from pin 68 of the MUPPET, and the switching time
determines the size and the place of the PIP picture.

Service Tips

•

When something is wrong in the Muppet, and the FBL
signal is "high" (example internal short circuit), then it is not
possible to force the main path signal by software.
However, you can do it manually by connecting the
command line (pin 5) of switch IC7P54 to ground.

•

When an error is communicated from the Muppet IC (no
I2C communication), the H_sync and V_sync from main
HIP must be checked (pin 94 or pin 70 of the Muppet IC).
When there is no H- or V_sync, the I2C communication is
interrupted.

9.6

Audio

This chassis can handle the following sound systems
(depending on the model):

•

Stereo.

•

Virtual Dolby Surround.

•

Dolby ProLogic 1 (4.1) and 2 (5.1).

•

Dolby Digital (AC3).

The audio functionality is build up around the:

•

MSP4450G (Multi Standard Sound Processor), in
combination with the MAS3529H (Dolby Digital Decoder)
and the DPL4519G (Dolby ProLogic Decoder) for full
Digital Dolby.

•

Or the MSP34x2 for the other executions.

The MSP IC takes care of the main FM sound decoding. It
contains digital audio processing, used for the basic left/right
stereo sound, such as bass, treble, balance, incredible sound
and spatial. Additionally, for Digital Dolby, the MSP4450G can
be "upgraded" with the MAS3529H (Dolby Digital Decoder) and
the DPL4519G (Dolby ProLogic Decoder).

9.6.1

Audio: Inputs / Outputs

Figure 9-9 Audio input block diagram

Inputs:

•

Up to four stereo audio inputs.

•

Front input.

•

2 * 2fH stereo inputs (for US).

•

2 * Bolt-on inputs (HDD or DVD).