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Pseudo-kvadraturni filtarski slogovi s gotovo potpunom rekonstrukcijom

Pseudo-kvadraturni filtarski slogovi s gotovo potpunom rekonstrukcijom. Lea Gagulić. Pojasno kodiranje. široka primjena kompresija zvuka i slike uvjet na filtarski slog – redukcija izobličenja ampitudna fazna aliasing. Pseudo-QMF slogovi. pseudo-kvadraturni filtarski slogovi

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Pseudo-kvadraturni filtarski slogovi s gotovo potpunom rekonstrukcijom

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  1. Pseudo-kvadraturni filtarski slogovi s gotovo potpunom rekonstrukcijom Lea Gagulić

  2. Pojasno kodiranje • široka primjena • kompresija zvuka i slike • uvjet na filtarski slog – redukcija izobličenja • ampitudna • fazna • aliasing

  3. Pseudo-QMF slogovi • pseudo-kvadraturni filtarski slogovi • pseudo-quadrature mirror filterbanks • preklapanje samo u susjednim pojasevima • gotovo potpuna rekonstrukcija

  4. Potpuna rekonstrukcija? • realizacija nemoguća FIR filtrima

  5. Gotovo potpuna rekonstrukcija • dizajn NP prototipa – npr. Parks McClellan • kosinusna modulacija

  6. granica područja gušenja – 1/M poj_prop – granica područja propuštanja početna – π/2M gr – greška filtra tol – tolerancija pr_gr – greška u prethodnom koraku Projektiranje

  7. M=8 NP prototip

  8. M=8 Slog - analiza

  9. M=8 Slog

  10. Primjer – šum

  11. Primjer - šum

  12. Zaključak • niska razina aliasinga • linearna faza • mala amplitudna izobličenja • jednostavan algoritam

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