What process does detection in a receiver involve?

Detection in a receiver primarily involves extracting the original information signal from the modulated carrier wave. This is integral to demodulating a received signal so that it can be interpreted. When considering the choices available, separating low frequencies from high frequencies is essential in the context of detection.

In many communication systems, especially in frequency modulation (FM) and amplitude modulation (AM), signals are encoded in varying frequency or amplitude formats. Detection requires the receiver to distinguish between these frequencies to accurately retrieve the intended information. Low frequencies often correspond to the audio signals we want to hear, while high frequencies might include unwanted noise or carrier frequencies used for transmission.

Therefore, the act of separating low frequencies from high frequencies is a key step in ensuring that the receiver successfully extracts the relevant information, making this choice the most accurate representation of the detection process.