Communication Systems: Electronic Communication, Basic Units of a Communication System (For CBSE, ICSE, IAS, NET, NRA 2022)

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It is a collection of individual telecommunications networks, transmission systems, relay stations, tributary stations, and terminal equipment usually capable of interconnection and interoperation to form an integrated whole.

Electronic Communication

Introduction to Communication Systems - ElectronX
  • The faithful transformation of message or information is known as electronic communication which can be available on the form of electrical current or voltage traveling from one point to another.

Basic Units of a Communication System

The basic units of a communication system are:

  • Transducer
  • Transmitter
  • Transmission Channel
  • Receiver
  • Transducer: Sensors, like microphones and cameras, capture non-electric sources, like sound and light (respectively) , and convert them into electrical signals.
  • Without input transducers there would not be an effective way to transport non-electric sources or signals over great distances
  • Transmitter: Once the source signal has been converted into an electric signal, the transmitter will modify this signal for efficient transmission.
  • Transmission Channel: A communication channel is simply referring to the medium by which a signal travels.
  • There are two types of media by which electrical signal travel, i.e.. guided and unguided.
  • Receiver: Once the signal has passed through the communication channel, it must be effectively captured by a receiver.
  • Goal of the receiver is to capture and reconstruct the signal before it passed through the transmitter.

Forms of the Communication System

  • The information usually is in the form of a continuous waveform. There are two forms of a communication system;
  • Analog
  • Digital

Bandwidth of a System

  • Every message signals constitute of various ranges of frequencies which are very vital for the necessary an optimal transmission of information in the signal.
  • Any practical communication supports a few ranges of frequencies.

What is Modulation

Frequencies which are low cannot travel long distances and for that, they are being superimposed with a high-frequency carrier signal in order to flow smoothly.

Types of modulation:

  • Pulse Position Modulation (PPM)
  • Pulse Width Modulation (PWM)
  • Pulse Duration Modulation (PDM)
  • Pulse Amplitude Modulation (PAM)

Developed by: