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Textbook by: Carlos E. Davila. E-mail the author

# The Unit Step Function

Module by: Carlos E. Davila. E-mail the author

The unit step function is defined as

u ( t ) = 1 , t 0 0 , t < 0 u ( t ) = 1 , t 0 0 , t < 0
(1)

This function is useful for defining signals which we wish to start at t=0t=0. In other words, often, we would like for signals to be zero for negative values of tt. We can force this situation by simply multiplying by u(t)u(t).

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