Hi everyone, This is my question: " Describe the concepts of PCM (Pulse Code Modulation) in a computer keyboard which its data are in digital format." This is my justification: How to describe the concepts of PCM ? Isn't PCM a technique used to transmit analog signals in digital transmission ? I mean, PCM converts the analog signals into digital pulses and then reconvert them back into its original form (analog) at the receiver of a system. So, can somebody please give me some clues to answer the question. Thanks in advance.