Thursday, February 17, 2011

1.4 Unit Impulse / Delta Function


  • Unit Impulse function is the derivative of unit step u0(t):


  • Two useful delta function properties are sampling & sifting property 
  • Sampling property:


  • Multiplication of any function f(t) by the delta function results in sampling the function at the time instants where the delta function is not zero. (foundation of discrete-time systems)
  • Sifting property:

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