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Communication theory: Deconstructing modulation, demodulation and multiplexing

Communication theory - best ece college in coimbatore
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The concept of communication theory comes under electronics and communication engineering to study transmission and receiving the electrical signals. What you need to know from this blog? You can get the insight of how communication through electrical signals are possible and the fundamentals of modulation, demodulation and multiplexing. Even if you can learn from the leading Electronics and Communication Engineering colleges in Coimbatore, here is a brief to learn before you set your career in communication systems. Let’s start with communication theory and opportunities in communication systems.

Communication theory defines:

There are a lot of features when it comes to communication theory which affects the process such as sender, receiver, noise, nonverbal cues, cultural differences and many more. To make it less complicated, the engineers concluded this communication theory with the communication models. There are various communication models which may be covered in your ECE syllabus when you consider starting your career in top colleges. Here, you can find the modulation and demodulation concepts how you can relate with real-time.


The process of converting information into electrical signals or carrier signals which optimize for transmission. These modulations have three types such as Frequency modulation, phase modulation, amplitude modulation.

Modulation applies to electromagnetic signals like radio waves, optics, computer networks, direct current that can act as a degenerate carrier with the fixed amplitude and frequency turning it on or off as a digital current loop interface. Modulation can apply to low frequency from 50-60Hz with the powerline networks.


The process of extracting the information from the transmitted signals and there are demodulator types to deliver the output signals in the form of sound, binary data or pictures. A signal that is wireless carried by a radio frequency carrier wave that has been audio frequency modulating. A telephone receiver’s surface cannot vibrate at high frequencies. Furthermore, the human ear cannot hear at this frequency. A demodulator is used to extract the audio frequencies from radio frequency carrier pulses.

The difference of modulation and demodulation:

The original message signal is combined with a carrier wave whose characteristics must be altered during modulation. To create an original information signal, the carrier and message signal are separated during demodulation. Modulation basically happens to transport data over a greater distance. To maintain the signal’s original shape, demodulation is used. Despite the fact that there are various techniques for regulation and demodulation processes, each enjoys its own benefits and disservices. For instance, AM is utilised in shortwave and radio wave broadcasting; FM is generally utilised in high-recurrence radio telecom, and heartbeat regulation is known for advanced signal tweak.


Multiplexing is the most common way of consolidating different signs into one sign, over a common medium. In the event that the simple signs are multiplexed, it is called as simple multiplexing. Essentially, in the event that the advanced signs are multiplexed, it is called as computerised multiplexing. Multiplexing was first evolved in communication. Various signs were joined to send through a solitary link. The most common way of multiplexing partitions a correspondence channel into a few numbers of intelligent channels, distributing every one for an alternate message signal or an information stream to be moved. Multiplexer or MUX refers to the device that performs multiplexing. The opposite cycle, i.e., separating the quantity of channels from one, which is finished at the collector is called as de-multiplexing. The gadget that does de-multiplexing can be called as demultiplexer.

Career opportunities in communication systems:

Electronics and communication engineers are in high demand across a wide range of sectors, with numerous established organisations and numerous job opportunities. Hardware is for all intents and purposes omnipresent. It is at the centre of the networks and communication systems that use a variety of technologies to send data, video, and voice. Electronic gear is progressing and developing more mind boggling, and it is being used all over, trendy businesses, endeavours, and even at our homes, since there is a human propensity to get things done quicker and better in this consistently advancing climate.

The ECE degree gives the opportunity to rehash the world and make it significantly more compelling, coordinated, and manageable. Through the turn of events, development, and utilisation of clever fixes to recent concerns, the program can possibly have an effect on the planet.

A wide range of correspondence, including computerised, satellite, versatile, remote, and radio correspondence as well as systems administration, are changed by the ECE program. The highest-paying and most satisfying careers are in electronics and communications engineering.

Students in ECE designing get top to bottom scholastic preparation, common sense experience, and authority advancement. For ECE graduates, there will probably be a much larger number of chances for progression than there have recently been.

The electronics and communication engineering colleges in Tamil nadu even have a high student-to-faculty ratio, which makes it easy to learn and helps students connect with one another. There are numerous opportunities for students to collaborate closely with any faculty member in the course’s curriculum.