Analog signal

An analog or analogue is any variable signal continuous in both time and amplitude. It differs from a digital signal Digital signal

The term digital signal is used to refer to more than one concept.... 

 in that small fluctuations in the signal are meaningful. Analog is usually thought of in an electrical Electricity

Electricity is a general term for the variety of phenomena resulting from the presence and flow of electric charge [i] ... 

 context, however mechanical, pneumatic, hydraulic, and other systems may also convey analog signals.

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Encyclopedia

An analog or analogue is any variable signal continuous in both time and amplitude. It differs from a digital signal Digital signal

The term digital signal is used to refer to more than one concept.... 

 in that small fluctuations in the signal are meaningful. Analog is usually thought of in an electrical Electricity

Electricity is a general term for the variety of phenomena resulting from the presence and flow of electric charge [i] ... 

 context, however mechanical, pneumatic, hydraulic, and other systems may also convey analog signals.
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