DSP LEC 3

is a sequence that is a function defined on the positive and negative integers.

A discrete-time signal whose values are from a finite set is called a _____________.

Signals are represented as sequence of number called _________. A _________value of typical discrete-time signals or sequence is denoted by ______ which is a function of independent variable that is an integer.

sometimes referred to as a UNIT IMPULSE

discrete-time sequence that is equal to zero for values of n outside a finite interval [N1 , N2].

• Finite-Length Sequence

• Infinite-Length Sequence

signals that are not finite in length, such as the unit step and exponential sequences.

• Finite-Length Sequence

• Infinite-Length Sequence

any infinite length sequence that is equal to zero for all values of n < n0 for some integer n0.

• Right-Sided Sequence

• Left-Sided Sequence

• Two-Sided Sequence

an infinite length sequence x(n), for some integer n0 is equal to zero for al n > n0.

• Right-Sided Sequence

• Left-Sided Sequence

• Two-Sided Sequence

an infinite length that is neither right-sided nor left sided, such as the complex exponential.

• Right-Sided Sequence

• Left-Sided Sequence

• Two-Sided Sequence

The independent variable, n, is replaced by n-k, where k is an integer.

• Time Shifting

• Time Scaling

• Folding or Reflection