Which signal processing component is responsible for reducing unwanted noise in an FM receiver?

The component responsible for reducing unwanted noise in an FM receiver is the filter. In the context of an FM receiver, filters are utilized to selectively allow the desired signal to pass through while attenuating or eliminating unwanted noise and interference. This process enhances the quality of the received signal and ensures that the audio output is clear and free from distortion caused by extraneous signals.

Filters are specifically designed to target certain frequency ranges; in an FM receiver, the filter would typically pass the frequencies associated with the FM signal and block out others, including noise. The effectiveness of a filter in an FM receiver is crucial for maintaining the integrity of the modulated signal and improving the performance of the receiver as a whole.

The other options serve different functions within the receiver system. For instance, the modulator is responsible for converting the audio signal into a frequency-modulated signal. The AFC (Automatic Frequency Control) mixer helps maintain lock on the desired frequency but does not specifically address noise reduction. The amplifier increases the signal strength, but that does not inherently reduce noise.