**Periodic signals :**

- A CT signal which repeats it self after a fixed time period is called as a periodic signal. The periodicity of a CT signal can be defined mathematically as follows :

x(t) = x(t+T

_{0})
Where ;

T

_{0 }= periodic of signal x(t)
periodic signal are sine wave, cosine wave, square wave etc.

Periodic signal |

**Non periodic signals :**

- A CT signal which does not repeat itself after a fixed time period or does not repeat at all is called as a non periodic signal.

The non periodic signal do not satisfy the condition of periodicity stated in equation :

x(t) ≠ x(t+T

_{0})
Sometimes it is said that an aperiodic signal has a periodic T

_{0 }= ∞. Figure shows a decaying exponential signal.**Periodic signals :**

- A CT signal which repeats it self after a fixed time period is called as a periodic signal. The periodicity of a CT signal can be defined mathematically as follows :

x(t) = x(t+T

_{0})
Where ;

T

_{0 }= periodic of signal x(t)
periodic signal are sine wave, cosine wave, square wave etc.

Periodic signal |

**Non periodic signals :**

- A CT signal which does not repeat itself after a fixed time period or does not repeat at all is called as a non periodic signal.

The non periodic signal do not satisfy the condition of periodicity stated in equation :

x(t) ≠ x(t+T

_{0})
Sometimes it is said that an aperiodic signal has a periodic T

_{0 }= ∞. Figure shows a decaying exponential signal.