[학부 과정] 디지털 신호 처리 3주차 [1]

Linearity

Time-invariant

Causal System

 

1.Linearity

Superposition

f(a+b)= f(a)+(b)

Ax1+Bx2 -> linear system ->Ay1+By2: Y add = Y(Ax1+Bx2)

linear system X

Time-invariance

Causality

it is the one whose output depends only on the current input and its past input sample values

만약에 미래 입력값에 의존하면  non-causal

non-causal system 현실에 존재하지 않음.

 

impulse response system

x(n) -> 델타

y(n) = x(n) * h(n)