MSP3402G 查看數據表（PDF） - Micronas

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MSP3402G

Multistandard Sound Processor Family with Dolby Surround Pro Logic

Micronas 

PRELIMINARY DATA SHEET

MSP 34x2G

2.1. Architecture of the MSP 34x2G Family

The block diagrams in Fig. 2–1, Fig. 2–2, and Fig. 2–3

show the signal flow in the MSP 34x2G in three modes

that can be set in the Output Configuration register.

– Standard mode (see Fig. 2–1).

The IC is compatible to the MSP 34x0G family.

– Virtual mode (see Fig. 2–2).

The IC is compatible to the Virtual Dolby

MSP 34x1G family.

– Multi-channel mode (see Fig. 2–3).

The three block diagrams show the features of the

MSP 3452G family member.

Other members of the MSP 34x2G family do not have

the complete set of features: The demodulator handles

only a subset of the standards presented in the

demodulator block; NICAM processing is only possible

in the MSP 3412G and MSP 3452G.

2.2. Sound IF Processing

2.2.1. 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 34x2G. 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 formed by the coupling capacitors at pins

ANA_IN1+ and ANA_IN2+ see Section 7.2. “Applica-

tion Circuit” on page 108 are sufficient in most cases to

suppress video components. Some combinations of

SAW filters and sound IF mixer ICs, however, show

large picture components on their outputs. In this case,

further filtering is recommended.

2.2.2. Demodulator: Standards and Features

The MSP 34x2G is able to demodulate all TV-sound

standards worldwide including the digital NICAM sys-

tem. Depending on the MSP 34x2G version, the fol-

lowing demodulation modes can be performed:

A2 Systems: Detection and demodulation of two sep-

arate FM carriers (FM1 and FM2), demodulation and

evaluation of the identification signal of carrier FM2.

NICAM Systems: Demodulation and decoding of the

NICAM carrier, detection and demodulation of the ana-

log (FM or AM) carrier. For D/K-NICAM, the FM carrier

may have a maximum deviation of 384 kHz.

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 Reduc-

tion (MNR).

Japan Stereo: Detection and FM demodulation of the

aural carrier resulting in the MPX signal. Demodulation

and evaluation of the identification signal and FM

demodulation of the (L−R)-carrier.

FM-Satellite Sound: Demodulation of one or two FM

carriers. Processing of high-deviation mono or narrow

bandwidth mono, stereo, or bilingual satellite sound

according to the ASTRA specification.

FM-Stereo-Radio: Detection and FM demodulation of

the aural carrier resulting in the MPX signal. Detection

and evaluation of the pilot carrier and AM demodula-

tion of the (L−R)-carrier.

The demodulator blocks of all MSP 34x2G versions

have identical user interfaces. Even completely differ-

ent systems like the BTSC and NICAM systems are

controlled the same way. Standards are selected by

means of MSP Standard Codes. Automatic processes

handle standard detection and identification without

controller interaction. The key features of the

MSP 34x2G demodulator blocks are:

Standard Selection: The controlling of the demodula-

tor is minimized: All parameters, such as tuning fre-

quencies or filter bandwidth, are adjusted automati-

cally by transmitting one single value to the

STANDARD SELECT register. For all standards, spe-

cific MSP standard codes are defined.

Automatic Standard Detection: If the TV sound stan-

dard is unknown, the MSP 34x2G can automatically

detect the actual standard, switch to that standard, and

respond the actual MSP standard code.

Automatic Carrier Mute: To prevent noise effects or

FM identification problems in the absence of an FM

carrier, the MSP 34x2G offers a configurable carrier

mute feature, which is activated automatically if the TV

sound standard is selected by means of the STAN-

DARD SELECT register. If no FM carrier is detected at

one of the two MSP demodulator channels, the corre-

sponding demodulator output is muted. This is indi-

cated in the STATUS register.

Micronas

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