Question

Which of the following is not a method to convert analog signals to digital signals?

(a) Pulse Code Modulation

(b) Pulse Amplitude Modulation

(c) Pulse Width Modulation

(d) Frequency Modulation

I have been asked this question in semester exam.

This intriguing question originated from Digital Input Output topic in division Arduino Programming of Arduino

Answer 1

Correct answer is (d) Frequency Modulation

Explanation: Any Modulation Technique that converts an analog signal to a digital signal is of immense importance in pure digital circuits like the Arduino. These help the Arduino’s circuit to receive raw unmodulated signals from the outside and process them in a digital environment. Here frequency modulation is the only modulation technique that only works with analog-to-analog signal modulation.