Final answer:
The statement that sampling takes periodic samples of the original analog signals is true. This process is essential for converting analog data, like sound or visual images, into digital signals which can be electronically processed. RC filters can be used to reduce 'noise' in these signals.
Step-by-step explanation:
The statement is true: sampling does take periodic samples of the original analog signals. In the context of signal processing, real-world data like sound or visual images are typically analog. These analog data vary continuously and must be converted into digital signals for use in electronic devices. This conversion is achieved through a process known as sampling, where the continuous analog signal is periodically measured at discrete time intervals. These measurements are taken at a specific rate known as the sampling rate, which is critical for accurately reconstructing the analog signal from the digital one. For effective sampling, a voltage cut-off value is set to determine the threshold for conversion from analog to digital signals.
Looking ahead to Alternating-Current (AC) circuits, AC voltages vary as sine functions with specific frequencies. During such recordings, which could be from atmospheric data or music, it is common to have unwanted frequencies or 'noise' in the signal. RC filters can be employed to mitigate these unwanted frequencies, ensuring that the sample more accurately reflects the desired signal without the noise.