| (a) |
List the four functions of a front-end
Processor. |
[4] |
| (b) |
Briefly describe the concept of modulation. |
[3] |
| (c) |
Explain the following with the aid of diagrams: |
|
|
(i) Frequency Modulation |
[4] |
|
(ii) Statistical Time Division Multiplexing |
[4] |
| (d) |
Pulse Code Modulation (PCM) is one of the most
common digitising techniques in use. The amplitude of each signal is approximated by an
n-bit integer with a digitised modem and the analog wave is then converted. Convert the
analog wave below to its PCM output (i.e. a binary form), using the time points shown as
sampling points. 
|
[5] |