Difference Between Analog and Digital Modulation

Modulation is required to convey signals from one medium to another. These mediums might be physical or through any other medium. The two most common modulations that exist and are utilized by humans are analog modulation and digital modulation. Many individuals favor this digital modulation because of its security and speed.

The distinction between analog and digital modulation is that analog modulation is a continuous signal, but digital modulation may be modified over time. Digital modulation, on the other hand, is a discrete signal that can only convey binary information. The sine wave is the wave utilized in analog modulation. However, a square wave is employed in digital modulation.

Modulation is the technique of adjusting one signal depending on another, and it is commonly employed in data transfer from one location to another. Although there are other forms of modulation, analog, and digital modulation are the two most common. The primary distinction between analog and digital modulation is how data is sent.

The input for analog modulation must be in analog format, whereas digital modulation requires data in digital format. Digital modulation, on the other hand, can only have a limited number of values inside a certain range. In analog modulation, signal separation is quite challenging. On the other hand, signal separation is much easier with digital modulation.

There are a variety of additional modulation strategies under both analog and digital modulation, each with its own set of advantages and disadvantages. However, each approach has the core feature of sending either a digital or analog signal. The primary benefit of digital modulation over analog transmission is that it produces higher fidelity. Any noise or interference within the chosen frequency spectrum is mixed in with the real signal when using analog modulation. Although there are several strategies to reduce noise, it will still cause some damage.

Analog modulation uses analog signals, whereas digital modulation uses digital signals. Analog modulation has a set of permissible values, but digital modulation has only two. Analog modulation is less expensive to set up than digital modulation. Digital modulation yields more precise results than analog modulation.

Read this article to find out more about Analog Modulation and Digital Modulation and how they are different from each other

What is Analog Modulation?

Analog modulation is a continuous signal that may be altered over time. Analog modulation will identify the wave in continuous modulation when the variable's time differs. It also aids in the transmission of low-frequency signals. It also accepts audio transmissions with high-frequency carrier signals.

If the values fall within the defined range, they are considered legitimate. It is the method through which analog baseband signals are conveyed. In this modulation, the finest example of analog modulation is amplitude modulation.

We can also convert analog modulation to digital modulation at times. We must collect a signal sample and qualify it to assess its resolution. When we transmit it to the system, we must establish binary values for it to interpret the digital signal. When we do this, we must keep two crucial things in mind.

What is Digital Modulation?

Digital modulation provides excellent security and allows information to be sent fast. They offer a high capacity for transferring enormous amounts of data via an analog medium, which is why they are in high demand. Depending on the type of combinations we will be using for our task, we may select a modulation from the three options presented. Digital modulation is the technique of encoding digital information to the transmitted signal frequency.

The encoding method will impact the bandwidth of the sent signal in this operation. It employs procedures that might be linear or nonlinear. There are three kinds of digital modulation. This modulation will send the digital signals at a higher frequency through the analog signal.

Digital modulation will allow us to send signals created in a digital circuit via physical media. They employ this because it allows them to handle signals with more security, and nothing is harmed in the process. Other modulations do not provide this level of protection. Furthermore, the digital systems utilized here are readily available around the world.

The benefit of employing digital modulation is its significantly lower noise ratio. In this case, the optical level will not affect the output level. Furthermore, there will be no degeneration in the system. With this modulation, you will be able to obtain more particular information about the data and faster access. As a result of the attributes listed above, it is in extremely high demand.

Digital modulation, on the other hand, employs square waves. Digital modulation, on the other hand, is a discrete signal that will convey binary information. Single-stage triggering is used in analog modulation. Digital modulation, on the other hand, employs consecutive triggering.

Differences between Analog Modulation and Digital Modulation

The following table highlights the major differences between Analog and Digital Modulation −


Analog Modulation

Digital Modulation


Analog modulation is a continuous signal with the ability to alter over time.

Digital modulation is a discrete signal that carries binary information.

Range of value

Analog modulation may represent any value within a certain range.

Digital modulation will only represent a subset of the values in the chosen range.


Analog modulation follows a sine wave

Digital modulation follows a square wave

signal distinction

In analog modulation, the signals are difficult to separate

The signals can be easily separated in digital modulation.

Triggering types

Analog modulation follows single-stage triggering

Digital modulation follows the sequential triggering.


The primary distinction between analog and digital modulation is that analog signals may be retrieved error-free, but digital signals may experience mistakes during recovery. Analog modulation is less susceptible to noise and interference, although digital modulation has a greater data capacity.

Analog modulation costs more than digital modulation. Because of the distinct channels created by digital modulation, we can obtain improved spectral efficiency. However, analog modulation is still required in some instances because of its tolerance to noise and multipath interference.

Updated on: 02-Feb-2023

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