Confused! -- Max frequency versus fundamental frequency Hello I understand the following question is very silly, however I am not sure about the answer. Lets consider we are saying there is a signal with a frequency of 4 Hz (for example). In such a statement, does it mean the maximum frequency is 4 Hz for this signal? If it does, why we refer it as the maximum frequency? What are other frequencies of this signal then? Or, should we say the max frequency is 4 Hz and the min frequency is 0 Hz for this signal, hence the baseband bandwidth is equal to 4 Hz if it is considered as a baseband signal. In addition, what would be the fundamental frequency (the lowest frequency component based on what the harmonics are determined) of such signal if we say a signal exists with frequency of 4 Hz? So, how do you identify the fundamental frequency and the maximum frequency? I would appreciate your time answering this.