request for answer of sum basic questrion in dsp

[sayurabh]

sumbasic

plz any body can tell me what is the relation between laplace transform and z transform? or how can function of s can be related with function of z ?

next one what is the difference between dtft and dft? why we use digital signal processing ?

plz anwer me as soon as possible and thanx in advance

 

[Communications_Engineer]

signal summation basics

for these you should be referring a book. They are very basic