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Old 23-02-2010, 12:13 AM   #11
Bota
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Default Re: ruFAQ - novi clanci

Quote:
Da se ovo ne bi de?avalo, koristi se antialiasing filtar, tj. filtar niskih učestanosti (low pass filter). On smanjuje signal koji je iznad polovine frekvencije odabiranja na nivo ispod praga odabiranja, i time sprečava aliasing efekat.
Jos jedna recenica koja nema smisla. Sta je to prag odabiranja?

Ako filtar "smanjuje" (vrlo nevjesto odabran termin, pravilnije bi bilo reci slabi) signal onda nakon filtriranja nivo signala ne prelazi neku odredjenu vrijednost. Ta vrijednost, u cijim granicama se krece nivo signala nakon filtriranja, ne moze se porediti sa nekakvim "pragom odabiranja". Termin prag odabiranja bi mogao dimenziono upucivati na frekvenciju (odabiranja?) ali nikako na nivo signala.
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