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HUMAN-COMPUTER INTERACTION AND COMMUNICATION SYSTEMS

6. Receiver

6. Receiver

Converts the received signal back into the original message.

  • The receiver captures the transmitted signal from the communication channel.
  • It processes the signal to extract the original message.

Components:

  • Demodulator: Converts the passband signal back to the baseband signal.
  • Decoder: Converts the coded message back to its original form.

Signal processing (e.g., amplification, filtering).

  • Demodulation (e.g., AM, FM, PM for analog; ASK, FSK, PSK for digital).

Examples: Mobile phones, radio receivers, computer network adapters. Radio receiver, optical receiver.

7. Decoder

  • The decoder converts the received signal back into a format understandable by the user.
  • It reverses the encoding process applied at the sender’s end.
  • Examples: Speakers converting electrical signals into sound, software decrypting encrypted messages.

8. Destination (Receiver End-User)

The final component that receives the interpreted message. The final point where the message is delivered and utilized.

  • It can be a person, computer system, or any device that utilizes the transmitted information.

Types:

  • Human: Ears (for audio), eyes (for video).
  • Machine: Computer, display screen.

Examples: A person receiving a phone call, a computer displaying an email.

Types of Communication Systems

Communication systems can be classified based on the mode of transmission: