Analog System: An electrical signal that varies with time is called an analog signal. A system that uses analog signals is called an analog system. Electronic devices use analog signals to carry out their internal functions. The value of an analog signal changes constantly over time. Examples: Current in electrical circuits, unwanted noise in radio waves and communications.
Digital Systems: All signals are just electrical currents. A signal that can take only two fixed values is called a digital signal. The two values that a digital signal represents are '0' or zero and '1' or one. It is the mathematical form of power quality, expressing two states of voltage. A system that is operated by digital signals is called a digital system.
Difference between analog system and digital system: Characteristics of analog system: (i) Electrical signal that varies with time is called analog system. (ii) A system in which analog signals are used is called an analog system. (iii) Value of analog signal changes with time. (iv) Example : Current in electrical circuits, waves and unwanted noise in communication analog signal is called.
Characteristics of Digital System : (i) A signal which can take only two fixed values i.e. binary numbers, is called digital signal. (ii) A system operated by digital signals is called a digital system. (iii) Digital signals represent two values, namely (0) zero and (1) one. (iv) It is the mathematical form of electric value, which expresses two states of voltage.
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