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MSP4408G Datasheet(PDF) 9 Page - Micronas |
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MSP4408G Datasheet(HTML) 9 Page - Micronas |
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9 / 85 page  PRELIMINARY DATA SHEET MSP 44x8G Micronas 9 2.2. MSP 44x8G 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 44x8G. The preselected sound IF signal is fed into an A/D-converter. An analog automatic gain circuit (AGC) allows a wide range of input levels. The highpass filters, formed by the cou- pling capacitors at pins ANA_IN1+ and ANA_IN2+ (see Section 7.3. “Application Circuit” on page 83), are sufficient in most cases to suppress video compo- nents. Some combinations of SAW filters and sound IF mixer ICs, however, show large picture components on their outputs. In this case, further filtering is recom- mended. 2.2.2. Demodulator: Standards and Features The MSP 44x8G is able to demodulate all TV-sound standards worldwide including the digital NICAM sys- tem. Depending on the MSP 44x8G 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: (Only possible in the MSP 4418G and MSP 4458G). 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 44x8G 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 44x8G demodulator blocks are described below. 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 44x8G 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 44x8G offers a carrier mute feature, which is activated automatically if the standard is selected by means of the STANDARD SELECT regis- ter. If no FM carrier is available at one of the two MSP demodulator channels, the corresponding demodula- tor output is muted. 2.2.3. Preprocessing of Demodulator Signals All demodulated signals must be processed by a deemphasis filter and adjusted in level (analog signals must also be dematrixed). The correct deemphasis fil- ters are already selected by setting the standard in the STANDARD SELECT register. The level adjustment has to be done by means of the FM/AM and NICAM prescale registers. The necessary dematrix function depends on the selected sound standard and the actual broadcasted sound mode (mono, stereo, or bilingual). It can be manually set by the FM Matrix Mode register or automatically set by the Automatic Sound Selection. |
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