#### x → y using h

just to show all filter design is same for every case when signal has ideal condition (Band limited, LTI System ). All analogy assume that we know the original continuous function

- s stands for sampling, d stands for discrete

- c stands for continuous

The factor in the equation accounts for the fact that each sample contributes a term of to the frequency domain representation

Sampling → discrete processing → Lowpass filter → Gain → De-sampling

Sampling Theory Notion

Sampling Theories