What is the bandwidth of a PCM?

The bandwidth of a Pulse Code Modulation (PCM) signal is determined by the Nyquist theorem, which states that the minimum sampling rate must be at least twice the highest frequency present in the analog signal. Therefore, if the highest frequency of the analog signal is ( f_m ), the required sampling rate is ( 2f_m ). The bandwidth of the PCM signal will typically be twice this sampling rate, resulting in a bandwidth of approximately ( 4f_m ). In practice, additional factors like filter roll-off may affect the actual bandwidth requirements.