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MSP34X0G Datasheet(PDF) 10 Page - Micronas |
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MSP34X0G Datasheet(HTML) 10 Page - Micronas |
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10 / 96 page  MSP 34x0G PRELIMINARY DATA SHEET 10 MICRONAS INTERMETALL 2.2.3. Preprocessing of Demodulator Signals The NICAM signals must be processed by a deempha- sis filter and adjusted in level. The analog demodu- lated signals must be processed by a deemphasis fil- ter, adjusted in level, and dematrixed. The correct deemphasis filters 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 stan- dard 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 Auto- matic Sound Selection. 2.2.4. Automatic Sound Select In the Automatic Sound Select mode, the dematrix function is automatically selected based on the identifi- cation information in the STATUS register. No I2C interaction is necessary when the broadcasted sound mode changes (e.g. from mono to stereo). The demodulator supports the identification check by switching between mono compatible standards (stan- dards that have the same FM mono carrier) automati- cally and non-audible. If B/G-FM or B/G-NICAM is selected, the MSP will switch between these stan- dards. The same action is performed for the stan- dards: D/K1-FM, D/K2-FM, and D/K-NICAM. Switching is only done in the absence of any stereo or bilingual identification. If identification is found, the MSP keeps the detected standard. In case of high bit-error rates, the MSP 34x0G auto- matically falls back from digital NICAM sound to ana- log FM or AM mono. Table 2–1 summarizes all actions that take place when Automatic Sound Select is switched on. To provide more flexibility, the Automatic Sound Select block prepares four different source channels of demodulated sound (Fig 2–3). By choosing one of the four demodulator channels, the preferred sound mode can be selected for each of the output channels (loud- speaker, headphone, etc.). This is done by means of the Source Select registers. The following source channels of demodulated sound are defined: – “FM/AM” channel: Analog mono sound, stereo if available. In case of NICAM, analog mono only (FM or AM mono). – “Stereo or A/B” channel: Analog or digital mono sound, stereo if available. In case of bilingual broad- cast, it contains both languages A (left) and B (right). – “Stereo or A” channel: Analog or digital mono sound, stereo if available. In case of bilingual broad- cast, it contains language A (on left and right). – “Stereo or B” channel: Analog or digital mono sound, stereo if available. In case of bilingual broad- cast, it contains language B (on left and right). Fig 2–2 shows the source channel assignment of the demodulated signals in case of manual mode. If man- ual mode is required, more information can be found in the section “Demodulator Source Channels in Manual Mode” on page 91. Fig 2–3 and Table 2–2 show the source channel assignment of the demodulated sig- nals in case of Automatic Sound Select mode for all sound standards. Note: The analog primary input channel contains the signal of the mono FM/AM carrier or the L+R signal of the MPX carrier. The secondary input channel contains the signal of the 2nd FM carrier, the L −R signal of the MPX carrier, or the SAP signal. 2.3. Preprocessing for SCART and I2S Input Signals The SCART and I2S inputs need only be adjusted in level by means of the SCART and I2S prescale regis- ters. Fig. 2–2: Source channel assignment of demodulated signals in Manual Mode Fig. 2–3: Source channel assignment of demodulated signals in Automatic Sound Select Mode Prescale primary channel secondary channel NICAM A NICAM B FM/AM Prescale NICAM FM/AM (Stereo or A/B) 0 1 FM-Matrix NICAM LS Ch. Matrix SC2 Ch. Matrix Output-Ch. Matrices must be set according the standard Prescale Automatic Sound Select NICAM A NICAM B FM/AM Prescale NICAM FM/AM Stereo or A/B Stereo or A Stereo or B 0 1 3 4 primary channel secondary channel LS Ch. Matrix SC2 Ch. Matrix Output-Ch. Matrices must be set once to stereo |
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