Which type of detector directly converts frequency variations back into the original signal format?

The FM detector is designed specifically to convert frequency variations of a modulated signal back into the original amplitude-modulated signal format. It effectively processes the frequency changes by demodulating the incoming frequency-modulated (FM) signal, extracting the information encoded in those frequency variations.

In an FM signal, information is carried by varying the frequency of the carrier wave, while the amplitude remains constant. The FM detector is capable of tracking these frequency changes, utilizing a process known as frequency demodulation to reproduce the original audio or data signal.

This is crucial in various applications, such as radio broadcasting and communication systems, where clarity and fidelity in the signal reproduction are essential. By directly translating these frequency variations, the FM detector ensures that the output closely resembles the original signal intended for transmission.