Question for difference sampling and modulation

[gmcfilter]

modulation sampling difference

hi

What is different sampling and modulation ?

 

[kranthi_m]

modulation and sampling difference

Modulation is the process in which some characteristic parameter of a high frequency signal is varied linearly with the amplitude of a message signal. Modulation is used to transmit low frequency message signal through a line or wireless media.
Sampling means instead of transmitting the analog signal as it is, few samples of it will be transmitted and observed at the receiving side to judge the actual signal. It is used in Pulse Code Modulation technique wher in continuous analog signal is sampled at discrete time intervals, quantised, digitised, modulated and then transmitted. All the samples together convey the information of the actual signal.