Which term describes circuits designed to pass a specific range of frequencies and reject others, i.e., band-limited circuits?

Which term describes circuits designed to pass a specific range of frequencies and reject others, i.e., band-limited circuits?

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

Answer: (C)

Filtering describes circuits that pass a specific range of frequencies and reject others. By shaping the signal’s spectrum, a filter defines a passband where frequencies are allowed to pass with minimal attenuation and attenuates frequencies outside that range. This explains how band-limited circuits are implemented, typically with band-pass filters that target a defined frequency interval. Other options describe different functions: demodulation extracts information from a carrier, while high-pass and low-pass refer to filters that pass frequencies above or below a cutoff, respectively, not the general concept of passing a specific band.

Filtering describes circuits that pass a specific range of frequencies and reject others. By shaping the signal’s spectrum, a filter defines a passband where frequencies are allowed to pass with minimal attenuation and attenuates frequencies outside that range. This explains how band-limited circuits are implemented, typically with band-pass filters that target a defined frequency interval. Other options describe different functions: demodulation extracts information from a carrier, while high-pass and low-pass refer to filters that pass frequencies above or below a cutoff, respectively, not the general concept of passing a specific band.