What circuit is indicated if a frequency discriminator is involved?

A frequency discriminator is a crucial component in the demodulation process of frequency modulation (FM) signals. Its purpose is to convert variations in frequency of the incoming modulated signal into variations in amplitude, which can then be processed to retrieve the original information.

In FM receivers, the frequency discriminator is typically used to effectively decode the modulated information carried by the variations in frequency. The discriminator can accurately extract the amplitude variations that correspond to the original audio or data signal. This makes it essential for any device designed specifically to process FM signals, where frequency shifts represent the data being transmitted.

While the other types of receivers mentioned—like the superheterodyne and regenerative receivers—have their own methods for tuning and demodulating signals, they are not specifically designed around frequency modulation processing in the same way FM receivers are. Thus, the presence of a frequency discriminator indicates that the circuit is meant for handling FM signals, confirming that it is an FM receiver.