Fourier transform of sinusoidal functions

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SUMMARY

The discussion focuses on the Fourier transform of sinusoidal functions, specifically utilizing the sinc function and the duality property in Fourier analysis. The key equations referenced include the sinc function defined as sinc(x) = sin(x)/x and the relationship between a rectangular pulse and its Fourier transform, pτ(t) = τ * sinc(τω/2π). Participants explore the implications of duality, concluding that the transform of a rectangular pulse can be expressed as τ * sinc(τt/2π) = 2πpτ(ω) for specific cases.

PREREQUISITES
  • Understanding of Fourier transforms and their properties
  • Familiarity with the sinc function and its applications
  • Knowledge of rectangular pulse functions in signal processing
  • Basic skills in sketching functions and interpreting graphical representations
NEXT STEPS
  • Study the properties of the Fourier transform, focusing on duality
  • Learn how to derive the Fourier transform of different pulse shapes
  • Explore the applications of the sinc function in signal processing
  • Practice sketching Fourier transforms of various functions, including rectangular pulses
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Students and professionals in electrical engineering, signal processing, and applied mathematics who are looking to deepen their understanding of Fourier transforms and their practical applications.

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Homework Statement



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Homework Equations


sinc(x) = [itex]\frac{sin(x)}{x}[/itex]

The Attempt at a Solution


bit unsure how to get started?? i know transform of rectangular pulse pτ(t)=τ*sinc(τω/2∏)

also that sin(ωt)= ejωt-e-jωt / (2)

I could also probably sketch sinc(t/2∏), if that helps.
 
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OK, so I guess I wasn't really thinking. There is duality property listed in my book, can I use that?

since x(t) ⇔ X(ω) then pτ(t)=τ*sinc([itex]\frac{τω}{2\pi}[/itex])

by duality X(t) ⇔ 2[itex]\pi[/itex]*x(-ω) then τ*sinc([itex]\frac{τt}{2\pi}[/itex])=2[itex]\pi[/itex]pτ(ω)

so for a) it would be 2[itex]\pi[/itex]p1(ω). got this right at least? and how would i sketch this. would i be able to swap ω with t and just sketch the rectangular function p1(t) with amplitude 2[itex]\pi[/itex]??
 
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