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Telekommunikation , Kiruna FM,PM F4_A

Telekommunikation , Kiruna FM,PM F4_A. Frekvens-och fasmodulering (FM) (PM). Bärvåg:. Bärfrekvens Fas Argument. Fasmodulering:. m(t)= meddelande. Frekvensmodulering:. är skalfaktorer. Ex:. FM :.

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Telekommunikation , Kiruna FM,PM F4_A

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  1. Telekommunikation , Kiruna FM,PM F4_A F4_A_be

  2. Frekvens-och fasmodulering (FM) (PM) Bärvåg: Bärfrekvens Fas Argument F4_A_be

  3. Fasmodulering: m(t)= meddelande Frekvensmodulering: är skalfaktorer Ex: F4_A_be

  4. FM: Momentan frekvens = derivatan av argumentet = Frekvensdeviation: F4_A_be

  5. Inför modulationsindex: F4_A_be

  6. F4_A_be

  7. J0() J1() C- m C C+ m J-1() W.BESSEL F4_A_be

  8. J0(b) J1(b) F4_A_be

  9. Spektrum FM-signal Modulationsindex = 2 Spektrum FM-signal Modulationsindex = 5 F4_A_be

  10. F4_A_be

  11. Carsons regel för bandbredd ( Jämför med AM ) För ”små”  kan visas att F4_A_be

  12. Smalbandig FM F4_A_be

  13. Fasmodulering : PM: m(t)= meddelande Ex: Jfr FM: F4_A_be

  14. sm(t) s(t) LP-filter ev(t) sv(t) VCO Faslåst slinga (PLL) F4_A_be

  15. Självsvängningsfrekvensen fv [kHz] ev(t) [V] VCO-samband F4_A_be

  16. PLL som syntesgenerator f0 LP-filter ev(t) f0 N VCO f0*N F4_A_be

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