Which of the following describes the role of a discriminator in an FM receiver?

The role of a discriminator in an FM (Frequency Modulation) receiver is to respond to frequency shift variations in the incoming signal. In FM transmission, information is encoded in the variations of the carrier frequency. When the FM signal is received, it experiences frequency shifts corresponding to the modulation. The discriminator detects these frequency changes and converts them into amplitude variations, which can then be further processed to retrieve the original information signal.

This function is crucial in demodulating the FM signal, allowing the receiver to accurately interpret the information being transmitted based on the frequency deviations. The effectiveness of this process directly influences the clarity and quality of the received audio or data.

The other options describe different functions that are not the primary role of a discriminator. While filtering unwanted signals, amplifying received frequencies, and converting analog to digital can be part of the broader signal processing in a receiver system, they do not specifically define the role of the discriminator, which is focused on interpreting frequency variations.