We will go through some general concepts before going to operations on signals,

**Periodic and aperiodic signals**
A signal is periodic if x(n) is periodic if

x(n+N)=x(n) for all n

else signal is aperiodic

**Symmertric and antisymmetric signals**
Signal is symmetric or even signal if

x(-n)=x(n) for all n

Signal is antisymmetric if

x(-n)=-x(n) for all n

**Causal and non-causal signals**
x(n) is causal if x(n) is zero or doent exist for values less than zero. In other words for causal sequence x(n) exist for only values of n greater than or equal to zero.

Other wise non-causal ie x(n) exist for negative values of n also.

x(n) is anti-causal if x(n) exist for n>=0 ie. x(n)=0 for n>=0

Rest after sometime i am taking a break buddy.

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