During the transmission of a signal, attenuation occurs and noise is picked up. State what is meant by noise.
By reference to (a), explain the advantage of the transmission of the signal in digital form rather than in analogue form.
Part of an analogue signal is shown in the graph below.
The signal is to be transmitted in digital form. The analogue signal is sampled at a frequency of 
using an analogue-to-digital converter (ADC). The ADC produces 4-bit numbers. The times 
at which the analogue signal is sampled are shown in the table below.
On the table above:
for the digital number at time 
, underline the least significant bit (LSB).
state the digital numbers corresponding to the sampling times between time 
and time 
.
and 0100 at 
