The spectrum of a bandpass signal is centered at which frequency?

The spectrum of a bandpass signal is centered at the frequency denoted as ( f_c ), often referred to as the carrier frequency. In a bandpass filter or signal, the center frequency represents the frequency at which the signal's amplitude is maximized and around which the signal's energy is distributed. This frequency is crucial because it defines the midpoint of the range of frequencies that the bandpass filter allows to pass through while attenuating frequencies outside this range.

Understanding this concept is key in signal processing as it determines how signals are transmitted and processed in various applications, such as communications. Other terms like power frequency, analog frequency, and digital frequency do not specifically pertain to the center frequency of a bandpass signal spectrum, making ( f_c ) the most appropriate choice.