Table 6.4 More Fourier transform pairs
δ(t) ↔ 1
sgn(t) ↔ 1/jπf
rect(t) ↔ sinc(f)
tri(t) ↔ sinc²(f)
δₜ₀(t) ↔ f₀δ_f₀(f), f₀ = 1/T₀
cos(2πf₀t) ↔ (1/2)[δ(f - f₀) + δ(f + f₀)]
1 ↔ δ(f)
u(t) ↔ (1/2)δ(f) + 1/j2πf
sinc(t) ↔ rect(f)
sinc²(t) ↔ tri(f)
T₀δₜ₀(t) ↔ δ_f₀(f), T₀ = 1/f₀
sin(2πf₀t) ↔ (j/2)[δ(f + f₀) - δ(f - f₀)]