Periodic and Aperiodic Signal

Data can be analog or digital. The term analog data refers to information that is continuous; digital data refers to information that has discrete states. Analog data take on continuous values. Digital data take on discrete values

Topics discussed in this section:

§Analog and Digital Data

§ Analog and Digital Signals

§ Periodic and Nonperiodic Signals

Analog and Digital Signals

•Signals can be analog or digital.

•Analog signals can have an infinite number of values in a range.

Digital signals can have only a limited
number of values

In data communications, we commonly use periodic analog signals and nonperiodic digital signals.

Periodic analog signals can be classified as simple or composite. A simple periodic analog signal, a sine wave, cannot be decomposed into simpler signals. A composite

periodic analog signal is composed of multiple sine waves.

Topics discussed in this section

§Sine Wave

§ Wavelength

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