Pulse Code Modulation - Understanding Digital Transmission

[jeejou]

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.

 

[mgb_phys]

You're right there is no sense in using PCM to talk between a digital keyboard and a computer.
It might make sense for receiving data from something like an analog joystick or touchpad, are you sure you read the question correctly?

 

[jeejou]

The question is correctly printed.

Describe the concepts of PCM (Pulse Code Modulation) in a computer keyboard which its data are in digital format.