comms topic no.1

• Electronic communication deals with the transmission, reception,

  and processing of information.
• Transmitter A collection of electronic circuits and components designed to convert an

  electrical signal into a signal suitable to the chosen medium.
• transmitter It consists of amplifiers, filters, oscillators, modulators, and mixers.
• channel - It is the medium where electronic signals are being sent.
• channel - It can be air, copper wire, or optical cable.
• receiver - It is a collection of electronic circuits that converts the electronic signal back into its original form.
• receiver - It consists of filters, demodulators, amplifiers, tuned circuits, and mixers.
• noise - It is interference that degrades the quality of the information in an electronic communication system.
• simplex - It is the simplest type of electronic communication system.
• half duplex - It is a form of two-way communication where the two parties can transmit information provided that only one party can use the channel at a time.
• full duplex - It is a form of two-way communication where the two parties can transmit information simultaneously.
• full/full duplex - It is a form of two-way communication where the two parties can transmit information simultaneously.
• analog signal - is a continuously varying electrical signal. Audio,

  video, and light when converted to an electrical signal will have an

  analog signal.
• digital signal - signal does not vary continuously.
• baseband - is the direct transmission of the electronic signal.
• baseband - The information signal is already compatible with the communication channel and doesn’t need any modification.
• modulation - is the process of impressing the baseband signal

  (intelligence) into a higher frequency signal (carrier).
• modulation - The information signal changes the property of the carrier to make it suitable in a communication medium.
• demodulation - is the reverse process of modulation where the original intelligence is recovered from the modulated signal.
• analog modulation - a. amplitude modulation (AM) b. frequency modulation (FM) c. phase modulation (PM)
• digital modulation - a. amplitude shift keying (ASK) b. frequency shift keying (FSK) c. phase shift keying (PSK) d. pulse code modulation (PCM)
• PCM - pulse code modulation
• PSK - phase shift keying
• FSK - frequency shift keying
• ASK - amplitude shift keying
• multiplexing - This technique made it possible to transmit two or more intelligence in a single communication channel. This intelligence is intended to a different receiver.