(a)[2]
State two advantages of sending data in digital form rather than in analogue form.
(b)[4]
The digital numbers shown in Fig. 5.1 are sent at a sampling rate of $500\,\text{Hz}$. After transmission, the digital numbers are converted back to analogue by a digital-to-analogue converter (DAC). On Fig. 5.2, finish the graph to show how the signal level from the DAC changes with time $t$.
(c(i))[1]
State what happens to the transmitted analogue signal when the sampling rate of the analogue-to-digital converter (ADC) and of the DAC is increased.
(c(ii))[1]
State the effect on the transmitted analogue signal when the number of bits used in each sample is increased.