Analog Signal vs. Digital Signal: What's the Difference?

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Key Difference

The difference between the analogue signal and the digital signal is that analogue signals are continuous signals whereas digital signals are discrete time signals.

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Analog Signal vs. Digital Signal

In computer science there are two types of signals that are analogue signals and digital signals, there is a lot of difference between analogue signals and digital signals but if we talk about the main difference, then the main difference between analogue signals and digital signals is analogue signals are continuous signals whereas digital signals are discrete time signals.

What are the signals used for? They are used to carry data from one place to other, like our mobile phones they are signals that are used for communications. If there are no signals, there will be no connection. Analogue signals are continuous signals that change in a period whereas digital signals are not constant. There is a difference of wave in both signals that are analogue and digital signals. Analogue signals from sine waves whereas digital signals make square waves.

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Analogue signals are continuous signals that make sine waves. Analog signals are the different signal strength that is called amplitude, analog signals also have a different frequency that is also known as time.  In analogue signals, we can see the different sine wave by the higher and lower points that waves make. In analogue signals frequency that is also known as time is measured from the left right as physical length. The sound we make is called analogue signals the reason is that the sound we made is not continuous. We speak with different frequencies all the time.  Analog signal is considered to be continuous wave and this continuous wave changes with time. Two types of analog signals are simple signals and composite signals. If we talk about a simple analogue single, simple analog signals are a sine wave that cannot be decomposed or divided.  And if we talk about multiple analog single, they are future decomposed into multiple sine waves. There are four factors of analog signals that are amplitude, period, frequency and phase.

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A digital signal is entirely opposite to analogue signal; digital signal is not continuous because they have discrete values. Digital signals are for a computer such as it has only binary values that are 0s and 1s. Digital signals cannot be taken as fraction values. Digital signals from a uniform structure that have a constant and consistent signal. Today digital signals are replacing analog signals on large scale because of its inherent reliability. The signals of our mobile phones are digital signals. Analog signals are used to carry signals in the same way, digital signals are also used to carry signals but the way for transformation is totally different from analogue signals. Digital signals are not continuous in time, they are binary in digits. Digital signals carry signals in form of bits. Harmonics is the decomposed digital signals that represent information.

Comparison Chart

BasisAnalog SignalDigital Signal
MeaningAnalogue signals are continuous signals.Digital signals are discrete time signals.
Waves Analogue signals are a sine wave.Digital signals are a square wave.
Range Analog signals have fixed range.Digital signals have not fixed range.
ExampleThe human voice is an example of analogue signalsComputer signals are an example of digital signals.

 Analog Signal

Analogue signals are continuous signals that make sine waves. Analogue signals are the different signal strength that is called amplitude; analog signals also have a different frequency that is also known as time.  In analogue signals, we can see the different sine wave by the higher and lower points that waves make. In analogue signals frequency that is also known as time is measured from the left right as physical length. The sound we make is called analogue signals the reason is that the sound we made is not continuous.

We speak with different frequencies all the time.  Analog signal is considered to be a continuous wave and this continuous wave changes with time. Two types of analog signals are simple signals and composite signals. If we talk about a simple analogue single, simple analogue signals are a sine wave that cannot be decomposed or divided.  And if we talk about multiple analogue singles, they are future decomposed into multiple sine waves. There are four factors of analogue signals that are amplitude, period, frequency and phase.

Digital Signals

A digital signal is opposite to analogue signal; digital signal is not continuous because they have discrete values. Digital signals are for a computer such as it has only binary values that are 0s and 1s. Digital signals cannot be taken as fraction values. Digital signals form a uniform structure that has a constant and consistent signal. Today digital signals are replacing analogue signals on a large scale because of its inherent reliability.

The signals of our mobile phones are digital signals. Analogue signals are used to carry signals in the same way, digital signals are also used to carry signals but the way for transformation is totally different from analogue signals. Digital signals are not continuous in time, they are binary in digits. Digital signals carry signals in form of bits. Harmonics is the decomposed digital signals that represent information.

Key Difference

  1. Analog signals are continuous signals whereas digital signals are discrete time signals.
  2. Analogue signals are sine wave whereas digital signals are a square
  3. Analogue signals have a fixed range whereas digital signals have not fixed
  4. The human voice is an example of analogue signals whereas computer signals are an example of digital signals.

Conclusion

Two types of signals are analogue signals and digital signals, both are totally different from each other, in this article above we see the clear difference between analogue signals and digital signals.

Explanatory Video