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Pilihan Topik Matematika - at ee-cafe.org

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Tabel-20.1. Pasangan transformasi Fourier.<br />

Sinyal f(t) F(ω)<br />

Impuls δ(t) 1<br />

Sinyal searah (konstan) 1 2π δ(ω)<br />

Fungsi anak tangga u(t) 1<br />

+ πδ(<br />

ω)<br />

jω<br />

Signum<br />

sgn(t)<br />

Exponensial (kausal) −αt<br />

( e ) u(t)<br />

Eksponensial (dua sisi) |<br />

e α |t<br />

Eksponensial kompleks<br />

2<br />

jω<br />

1<br />

α + j<br />

2α<br />

ω<br />

−<br />

2 2<br />

α<br />

+ ω<br />

j t<br />

e β 2π<br />

δ(<br />

ω − β)<br />

Kosinus cosβt π [ δ( ω − β)<br />

+ δ(<br />

ω + β)<br />

]<br />

Sinus sinβt − j π [ δ( ω − β)<br />

− δ(<br />

ω + β)<br />

]<br />

Tabel-20.2. Sif<strong>at</strong>-sif<strong>at</strong> transformasi Fourier.<br />

Sif<strong>at</strong> Kawasan Waktu Kawasan Frekuensi<br />

Sinyal f(t) F(ω)<br />

Kelinieran A f 1 (t) + B f 2 (t) AF 1 (ω) + BF 2 (ω)<br />

Diferensiasi<br />

Integrasi<br />

df ( t)<br />

jωF(ω)<br />

dt<br />

t<br />

F(<br />

ω)<br />

f ( x)<br />

dx<br />

+ π F(0)<br />

δ(<br />

ω)<br />

∫ −∞<br />

jω<br />

Kebalikan f (−t) F(−ω)<br />

Simetri F (t) 2π f (−ω)<br />

Pergeseran waktu f (t − T) − jωT<br />

e F(ω)<br />

Pergeseran frekuensi e j β t f (t) F(ω − β)<br />

Penskalaan |a| f (<strong>at</strong>) ⎛ ω ⎞<br />

F ⎜ ⎟<br />

⎝ a ⎠<br />

293

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