A digital signal is produced by sampling an analogue signal and passing the samples through an analogue-to-digital converter (ADC).
State what is meant by a digital signal.
State one change to the sampling or to the ADC that will improve the accuracy of reproduction of the original analogue signal.
The least significant bit of the four-bit digital number 1100 represents a signal voltage of 
. Determine the signal voltage, in 
, represented by this digital number.
.
