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CAP3001A Datasheet(PDF) 9 Page - Micronas |
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CAP3001A Datasheet(HTML) 9 Page - Micronas |
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9 / 37 page  CAP 3001 A MICRONAS INTERMETALL 9 2.1.13. Digital Mixing Systems 2.1.13.1. Pilot Demodulator PILMX The entire system is synchronized with the pilot tone of the FM-stereo channel. In the pilot-demodulator 2 mix- ers working in quadrature are used. The quadrature mix- er is the phase detector of the PLL; the other parts of the PLL (loop filter and VCO) are realized in the DSP. The inphase mixer outputs information concerning the level of the pilot tone to the DSP to allow a decision “FM-ste- reo” or “FM-mono”. The time relation between the mixer sequences of stereo-demodulator and pilot-demodula- tors is fixed. A D LPF 02 36 A D A D ASU LPF 23 3 LPF 34 2 LPF 02 36 ASU LPF 23 3 LPF 34 2 ASU HIGH PASS ASU DETECT LPF 23 3 LPF 35 8 LPF 35 8 PILMIX PILMIX LPF 01 18 LPF 12 2 LPF 24 6 ARI MIX LPF 45 4 LPF 24 6 ARI MIX LPF 45 4 A D LPF 06 540 A D LPF 05 864 PILOT NOTCH AMMIX DSP AMMIX Main 1 Main 2 ARI/ RDS Level POT PILOT NOTCH Fig. 2–5: Digital signal processing blocks, input side INT 12 2 INT 28 4 4 3 D A INT 12 2 INT 28 4 NOISE SHA- PING D A DSP 4 3 Fig. 2–6: Digital signal processing blocks, output side NOISE SHA- PING |
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Descripción similar - CAP3001A |
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