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MSP3407G Datasheet(PDF) 10 Page - Micronas |
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MSP3407G Datasheet(HTML) 10 Page - Micronas |
10 / 81 page MSP 34x7G PRELIMINARY DATA SHEET 10 Micronas 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 standard and the actual broadcasted sound mode (mono, stereo, or bilingual). It can be manually set by the FM Matrix Mode register or automatically by the Automatic 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 inter- action 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 standards: D/K1-FM, D/K2-FM, D/K3-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 34x7G 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. 2–2). 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 and Table 2–2 show the source channel assignment of the demodulated signals 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 con- tains the signal of the 2nd FM carrier, the L-R signal of the MPX carrier, or the SAP signal. Fig. 2–2: Source channel assignment of demodulated signals in Automatic Sound Select Mode 2.2.5. Manual Mode Fig. 2–3 shows the source channel assignment of demodulated signals in case of manual mode. If man- ual mode is required, more information can be found in Section 6.7. “Demodulator Source Channels in Manual Mode” on page 75. Fig. 2–3: Source channel assignment of demodulated signals in Manual Mode FM/AM Stereo or A/B Stereo or A Stereo or B 0 1 3 4 primary FM/AM Prescale NICAM Prescale Automatic Sound Select channel secondary channel NICAM A NICAM B LS Ch. Matrix Output-Ch. matrices must be set once to stereo. FM/AM (Stereo or A/B) 0 1 primary FM/AM Prescale NICAM Prescale FM-Matrix channel secondary channel NICAM A NICAM B LS Ch. Matrix Output-Ch. matrices must be set according to the standard. NICAM |
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