What process creates a digital signal?

• A. Amplifying the signal
• B. Filtering the signal
• C. Sampling analog voltages
• D. Converting to DC

Answer: (C)

Creating a digital signal starts with turning a continuous, analog waveform into a set of discrete values taken at regular time intervals. This sampling step captures the signal’s amplitude at those moments, producing a sequence of samples that can be encoded digitally (often with an additional quantization step to assign finite levels to each sample). Amplifying or filtering keeps the signal in analog form and doesn’t produce a discrete, time-sampled representation. Converting to DC would collapse the signal to a constant value, losing the waveform information. Therefore, sampling analog voltages is the process that creates a digital signal.