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Telekommunikation TDV F5

Telekommunikation TDV F5. Frekvens-och fasmodulering (FM) (PM). Bärvåg:. Bärfrekvens Fas Argument. Fasmodulering:. m(t)= meddelande. Frekvensmodulering: . är skalfaktorer. Ex: . FM :.

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Telekommunikation TDV F5

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  1. Telekommunikation TDV F5 F4_be_03_PS

  2. Frekvens-och fasmodulering (FM) (PM) Bärvåg: Bärfrekvens Fas Argument F4_be_03_PS

  3. Fasmodulering: m(t)= meddelande Frekvensmodulering: är skalfaktorer Ex: F4_be_03_PS

  4. FM: Momentan frekvens = derivatan av argumentet = Frekvensdeviation: F4_be_03_PS

  5. Inför modulationsindex: F4_be_03_PS

  6. F4_be_03_PS

  7. J0() J1() C- m C C+ m J-1() W.BESSEL F4_be_03_PS

  8. J0(b) J1(b) F4_be_03_PS

  9. Spektrum FM-signal Modulationsindex = 2 Spektrum FM-signal Modulationsindex = 5 F4_be_03_PS

  10. F4_be_03_PS

  11. Carsons regel för bandbredd ( Jämför med AM ) För ”små”  kan visas att F4_be_03_PS

  12. Smalbandig FM F4_be_03_PS

  13. Fasmodulering : PM: m(t)= meddelande Ex: Jfr FM: F4_be_03_PS

  14. sm(t) s(t) LP-filter ev(t) sv(t) VCO Faslåst slinga (PLL) F4_be_03_PS

  15. Självsvängningsfrekvensen fv [kHz] ev(t) [V] VCO-samband F4_be_03_PS

  16. PLL som syntesgenerator f0 LP-filter ev(t) f0 N VCO f0*N F4_be_03_PS

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