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

Which of the following is not a method to convert analog signals to digital signals? Correct Answer Frequency Modulation

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.
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