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Lecture notes 2011 (slides), pdf.file - Katedra matematiky FEL ČVUT

Lecture notes 2011 (slides), pdf.file - Katedra matematiky FEL ČVUT

Lecture notes 2011 (slides), pdf.file - Katedra matematiky FEL ČVUT

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Souvislost Fourierovy transformace a Fourierovy ˇrady<br />

Pˇredpokládejme, že f (t) je periodická funkce s periodou T > 0<br />

taková, že<br />

a+T<br />

a<br />

|f (t)| dt < ∞ .<br />

Označme 1 charakteristickou funkci intervalu<br />

< a, a + T > a<br />

fT = 1 · f (t) .<br />

Pro Fourier˚uv koeficient, cn, funkce f (t) platí<br />

cn = 1<br />

T<br />

a+T<br />

a<br />

f (t) e −jnωt dt = 1<br />

T ˆ fT (nω)<br />

Jan Hamhalter http://math.feld.cvut.cz/hamhalte Matematika pro Kybernetiku <strong>Lecture</strong> Notes 221 / 369

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