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Discrete-Time Fourier Transform Properties with Proofs


Property Name Property Proof
Periodicity Χ(ω + 2π) = Χ(ω) Example
Linearity ax1[n] + bx2[n] → aΧ1(ω) + bΧ2(ω) Example
Time Shifting & Frequency Shifting 1) x[n - no] → e-jωnoX(ω)

2) e-jωonx[n] → X[ω - ωo]

Example
Conjugate & Conjugate Symmetry x[n] → X*(-ω) Example
Parversal Relation Example Example
Convolution Example Example
Multiplication Example Example
Duality Example Example
Differentiation in Frequency Example Example

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Basic linear algebra uncovers and clarifies very important geometry and algebra.

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