Modulation and Demodulation 

The communication system of today is a complicated system composed of multiple components that must all operate in concert in order to function properly around the clock. The MODEM, on the other hand, is one of the most important and fundamental components of the communication system. This is an abbreviation for the terms modulator and demodulator, and it refers to a coupled system that has completely transformed the worldwide communication environment. Modulation is the process of encoding information in a broadcast signal, whereas demodulation is the process of extracting information from a transmitted signal. Modulation and demodulation are both used in communications. The degree to which the extracted information mimics the original input information is influenced by a variety of factors.

Modulation 

In information technology, modulation is the process of turning data into electrical or optical carrier signals that are optimized for transmission. To put it another way, carrier waves are slightly similar to sine waves in that they are composed of constant frequency, but they have a higher frequency component.

Types of modulation 

Frequency modulation

A carrier wave’s frequency can alter or vary due to variations in the frequency of signal modulation, while the carrier wave’s amplitude and frequency remain constant. This is referred to as frequency modulation.

Phase modulation 

Phase modulation is defined as the process by which the phase of a high-frequency carrier wave changes or varies as a result of the change in the phase of the signal modulation while the amplitude and frequency remain at a constant condition.

Amplitude modulation 

Amplitude modulation is a term used to describe when the amplitude of a high-frequency carrier wave changes or varies as a result of a change in the amplitude of the signal modulation while the phase and frequency remain at their constant states.

What is the use of modulation in communication?

The modulation approach increases the message signal’s frequency to a useful range for transmission. Modulation’s importance in the communication system is summarized in the following points.

Multiplexers are used in signal transmission to simultaneously send signals from several sources over a common channel. When these signals are broadcast concurrently within a specified bandwidth, interference occurs. To address this, voice signals are modulated to a variety of carrier frequencies, allowing the receiver to tune them to the desired bandwidth within the transmission range.

Another technical reason is that the antenna size is inversely proportional to the radiated signal’s frequency. The antenna aperture size should be at least one-tenth the wavelength of the signal. Its size is impractical at 5 kHz; consequently, increasing the frequency via modulation will undoubtedly reduce the antenna’s height.

Modulation is necessary for signal transmission over long distances, as low-frequency signals cannot be transmitted over such lengths.

Similarly, modulation is critical for allocating more channels to consumers and increasing noise immunity.

Demodulation 

Demodulation is the process of restoring the original form of a data modulated carrier wave to its original form. A demodulator signal circuit is used to recover data from a modulator carrier wave, which is generated by the modulator. Demodulators are also available in a variety of configurations. The output signal of the demodulator might be described as a sound, binary data, or a series of pictures.

Essentially, demodulation is the process of recovering the original information-carrying signal from a carrier wave. A demodulator is an electrical circuit that is used to extract the information content of a modulated carrier wave from the carrier wave itself. As there are many different types of modulation, there are also many different types of demodulators.

The differences between Modulation and Demodulation

• While modulation aids in the gathering of data into the carrier, demodulation aids in the recovery of that data from the carrier. While there are some noticeable differences between the two of them as a whole, there are several that stand out.
• When it comes to communication systems, modulation is done at the transmitter end of the chain. Demodulation, on the other hand, is performed at the receiver end of a communication system.
• Modulation is the process of combining an original message signal with an additional carrier wave, the parameters of which must be adjusted. In demodulation, the combination of the carrier signal and the message signal is separated from one another in order to produce an original information signal.
• MODULATION: Modulation is a technique used to transport data across a longer distance. Demodulation is performed in order to maintain the original shape of the signal.

Conclusion 

The MODEM is an abbreviation for the terms modulator and demodulator. Modulation is the process of encoding information in a broadcast signal, while demodulation is extracting information from a transmitted signal. The degree to which extracted information mimics the original input information is influenced by a variety of factors. A demodulator is an electrical circuit that is used to extract the information content of a modulated carrier wave from the carrier wave itself. Modulation is the process of combining an original message signal with an additional carrier wave, the parameters of which must be adjusted.