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CIRCUIT DESCRIPTIONS
D60WLCD - 923-03486
3-15
094A - SERVICING
SOUND PROCESSOR
INTRODUCTION
The MSP 3440G 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 processed analog AF-out, is performed on a
single chip. Surround sound can be simulated with two
loudspeakers. These TV sound processing ICs include
versions for processing the multichannel television
sound (MTS) signal conforming 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 3440G 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 subsequent switching between mono/
stereo/bilingual; no I2C interaction is necessary (Auto-
matic Sound Selection).
SOUND IF PROCESSING
1) Analog Sound IF Input
The input pins , , and ANA_IN-offer
the possibility to connect two different sound IF (SIF)
sources to the MSP 3440G. The analog-to-digital
conversion 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 are formed by the coupling capacitors at
pins and .
2) Demodulator: Standards and Features
The MSP 3440G is able to demodulate all TV-sound
standards 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.
BTSC-Stereo: Detection and FM demodulation of the
aural carrier resulting in the MTS/MPX signal. Detec-
tion and evaluation of the pilot carrier, AM demodula-
tion of the (L-R)-carrier and detection of the SAP sub-
carrier. Processing of DBX noise reduction or MICRONAS
Noise Reduction (MNR).
BTSC-Mono + SAP: Detection and FM demodulation of
the aural carrier resulting in the MTS/MPX signal.
Detection and evaluation of the pilot carrier, detection
and FM demodulation of the SAP subcarrier. Process-
ing of DBX noise reduction or MICRONAS Noise Reduction
(MNR).
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