Since you're looking for a simple article about "What is 'analog signal'", you've found the right place.

A nominally continuous electrical signal that varies in amplitude or frequency in response to changes in sound, light, heat, position, or pressure.

In electrical engineering, signals are basically time-varying quantities (usually voltage or current).

So when we talk about the signal it means we are talking about a voltage thatβs changing over time.

Analog signal can have infinite number of values and varies continuously with time.

Analog signal is usually represented by sine wave.

As shown in figure each cycle consists of a single arc above the time axis followed by a single arc below the time axis.

Example of analog signal is human voice.

When we speak, we use air to transmit an analog signal.

Do you know what makes people curious? Here are a few questions and answers:

## Analog signal

### What do you mean by analog signal...

An analog signal is any continuous signal representing some other quantity, i.e., analogous to another quantity. For example, in an analog audio signal, the instantaneous signal voltage varies continuously with the pressure of the sound waves.

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