USS_04_Fourierova_transformace

USS_04_Fourierova_transformace - USS Kuchaov Fourierova...

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Unformatted text preview: USS Kuchaov Fourierova transformace Klov slova Fourierova transformace Dleit pojmy Fourierova transformace Vyjden neperiodickho asov zvislho signlu pomoc harmonickch signl, tj. funkc sin a cos, obecn tedy funkce komplexn exponencily. Slou pro pevod signl z asov oblasti do oblasti frekvenn. Diskrtn signly Fourierova transformace funkce f(n) je definovna vztahem Zptn fourierova transformace F () se tak nazv spektrum | F ()| je amplitudov spektrum () je fzov spektrum . Je-li signl reln, je amplitudov spektrum sudou funkc frekvence a fzov spektrum lichou funkc frekvence. Spektrum je periodick s amplitudou 2pi! Podmnkou pro to, aby F () konvergovalo je (podobn jako u Dirichletovch podmnek) aby signl byl absolutn sitateln, tj. aby platilo Vechny fyzikln realizovateln signly spluj tuto podmnku....
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This note was uploaded on 05/26/2010 for the course USS 4 taught by Professor Jiřina during the Spring '10 term at Univerzita Karlova.

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USS_04_Fourierova_transformace - USS Kuchaov Fourierova...

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