Continuous signals are characterized as analog.
Signals that are broken up into binary code are characterized as digital.
An AM/FM radio is a good example of technology is analog.
A smart phone is a good example of technology is digital.
The analog signals are continuous in nature.
Sound can be recorded, stored and played by the use of either digital or analog techniques.
The analog signal are the continuous electrical signal and the digital are the discrete packet of signals.
Radio waves are broadcasted as continuous signals while smartphone are digital type.
Thus, correct order is analog - digital - analog - digital
Learn more about analog signals.
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