LG MW-60SZ12 Service Manual page 20

2 MSP3410G :
Sound Block
(1) Introduction
The MSP 3410G family of single-chip Multistandard Sound
Processors covers the sound processing of all analog TV-
Standards worldwide. The full TV sound processing, starting
with analog sound IF signal-in, down to pro-cessed analog
AF-out, is performed on a single chip.
Figure shows a simplified functional block diagram of the
MSP 3410G.
Surround sound can be reproduced to a certain extent with
two loudspeakers.
These TV sound processing ICs include versions for process-
ing the multichannel television sound (MTS) signal conform-
ing to the standard recommended by the Broadcast
Television Systems Committee (BTSC).
The DBX noise reduction, or alternatively, MICRONAS Noise
Reduction (MNR) is performed alignment free.
The MSP 3410G has built-in automatic functions: The IC is
able to detect the actual sound standard automat-ically
(Automatic Standard Detection). Furthermore, pilot levels and
identification signals can be evaluated internally with subse-
quent switching between mono/stereo/bilingual; no I
action is necessary (Auto-matic Sound Selection).
(Fig Simplified functional block diagram of the MSP 3410G)
(2) Features
• Automatic Standard Detection of terrestrial TV standards
• All NICAM standards
• All Analog FM-Srereo A2 standards
• Simultaneous demodulation of high-deviation FM-Mono and
NICAM (China)
• Very high-deviation FM-Mono mode(China,Eutelast,etc.)
• FM demodulation of all analog satellite standards.
• ADAPTIVE deemphasis for satellite(According to ASTRA
specification)
• ASTRA Digital Radio(ADR) together with DRP3510A.
(3) Sound IF Processing
1) Analog Sound IF Input
The input pins ANA_IN1+, ANA_IN2+, and ANA_IN-offer
the possibility to connect two different sound IF(SIF)
sources to the MSP 3440G. The analog-to-digital conver-
sion of the preselected sound IF signal is done by an A/D-
converter. An analog automatic gain circuit(AGC) allows a
wide range of input levels. The high-pass filters formed by
the coupling capacitors at pins ANA_IN1+ and ANA_IN2+.
2) Demodulator: Standards and Features
The MSP 3440G is able to demodulate all TV-sound stan-
dards worldwide including the digital NICAM system.
Very high deviation FM-Mono: Detection and robust
demodulation of one FM carrier with a maximum devi-ation
of 540 kHz.
2 C inter-
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