Which term describes an electronic function that decreases the amplitude of some frequencies relative to others?

Which term describes an electronic function that decreases the amplitude of some frequencies relative to others?

• A. Demodulation
• B. Detection
• C. Filtering
• D. High-pass

Answer: (A)

Filtering is the process that alters a signal’s spectrum by attenuating certain frequencies more than others. This exactly describes decreasing the amplitude of some frequencies relative to others. High-pass is a specific type of filter that attenuates low frequencies while passing higher ones, but the general term for the described function is filtering. Demodulation is about recovering the original signal from a modulated carrier, and detection is about recognizing or measuring the signal, neither of which inherently shapes the spectrum in a frequency-selective way.

Filtering is the process that alters a signal’s spectrum by attenuating certain frequencies more than others. This exactly describes decreasing the amplitude of some frequencies relative to others. High-pass is a specific type of filter that attenuates low frequencies while passing higher ones, but the general term for the described function is filtering. Demodulation is about recovering the original signal from a modulated carrier, and detection is about recognizing or measuring the signal, neither of which inherently shapes the spectrum in a frequency-selective way.