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Communication Terms

Definitions

QuestionAnswer
Frequency the number of waves to pass a point in one second
Frequency Modulated the frequency of a carrier radio wave which is modified to carry broadcast information
Geostationary Satellite satellite held in a fixed position in orbit above earth
Graded Optical Fibre optical fibres which are more optically dense towards the centre and less optically dense towards the edge of the fibre
Hertz measurement of frequency; the number of waves to pass a point in one second
High Earth Orbit geostationary satellites are placed in High Earth Orbit 36000km above the Earth's surface
Impulse short burst of energy
Incident angle The angle between the normal and the entering light beam
Information System way of transferring information from place to place that used energy
Infra-Red waves of the electromagnetic spectrum with wavelengths ranging from 700nm to 1nm
Internet worldwide computer networks linked through telecommunication lines and electromagnetic waves
Ionosphere ionised region of the atmosphere extending about 1000 km above Earth's surface
Kinetic Energy movement energy
Land Connected Telephones telephones connected by landlines
Aerial Device for transmitting and/or receiving radio waves
Amplitude modulated (AM) The height of a carrier radio wave is modified to carry broadcast information; AM radio waves
Analog Information not coded as ons or offs or zeros and ones
Antenna Metal wire which detects radio waves
Bandwidth The range of frequencies over which an electromagnetic wave is transmitted
Bar code series of black and white lines containing code information representing the manufacturing country, the manufacturer and the item code
Boosting Using electricity to enhance a signal for better volume and clarity
Cathode ray tube vacuum sealed space where a beam of electrons is fired at a screen coated with phosphor
Cladding in terms of optical fibres; the material coating the optical fibre which is less optically dense than the core of the optical fibre
Code a collection of symbols used for communication
C0der Transforms information into a specific code
Communication System Information transfer system. Information transfer system.
Compact Disc Thin reflective metallic disc with tiny bits containing information for computers and/or stereos such as computer programs or music.
Compact Disc Player Device for changing compact disc information into sound. Device for changing compact disc information into sound.
Compression Part of a sound wave where the particles of matter are closest together.
Constellation A constellation is a series of satellites which together provide data cover of particular parts of the Earth.
Crest The highest point of a wave equal to the densest part of a sound wave compression.
Critical Angle The incident angle at which a beam of light will travel along the edge of an optically denser medium.
Decoder Transforms coded information into another form.
Demodulator Removes the carrier wave from the radio signal.
Diaphragm Vibrating membrane in microphone or speaker.
Radio (receiver) Device which tunes into specific AM and FM radio waves for information transmission
Radio frequency amplifier Boosts selected radio frequencies
Radio telescope Large dish-shaped object to reflect radio waves to a central point for collection
Random Access Memory (RAM) Where information is temporarily held electrically in a computer's memory
Rarefaction Part of a wave where the particles of matter are furthest apart
Receiving Dish Dish-shaped object that collects then reflects electromagnetic waves to a central point for collection
Refractive index Measure of ability of a material to bend light; the higher the refractive index the more bending of light occurs and the more likely it is that total internal reflection occurs
Satellite Object held in orbit around a body such as a planet due to gravity
Satellite dish Reflects electromagnetic waves to a receiver
Short Waves (SW) AM radio waves of short wavelength and high frequency that are reflected by the ionosphere and Earth and so used for overseas broadcasts
Silicone (in terms of fibre optics) a flexible layer surrounding an optical fibre and cladding for protection
Small-diameter core Optical fibre with a diameter small enough to fit only one light impulse at any one time
Sound system Plays music from compact discs, tapes or the radio
Technophobe Person with fear or dislike of modern technology
Telecommunication Any communication involving the use of connecting lines or electromagnetic waves over long distance
Landline Wires or cables used as communication links running above or below ground
Larynx Voice box containing vocal cords
Line of sight Unimpeded view between two points such as a transmitter and receiver
Longitudinal Waves that compress particles of matter, transferring energy in the same direction as the wave movement
Low Earth orbit Satellite orbit about 1000 km or less from Earth
Magnetic strip Strip on credit cards, key cards and travel tickets containing magnetically aligned digital information
Mechanical waves Waves that require a medium for transmission
Medium Earth orbit Satellite orbit about 10 000 km from Earth
Megahertz Millions of hertz
Micrometre One millionth of a metre
Microwaves Part of the electromagnetic spectrum from 1 mm to 30 cm in wavelength
Mobile phone Telephone using microwave transmissions for communication between transmitting towers and mobile telephones
television (receiver) cathode ray tube a screen attached to an aerial for radio wave reception; pictures appear on the screen due to the cycling of an electron beam across the screen.
total internal reflection reflection of light off the sides of a denser medium back inside the denser medium
transmitting tower tall tower which sends radio waves or microwaves for communication purposes
transverse the direction of energy movement is at right angles to the wave travel direction
trough the lowest point of a wave equal to the zone of lowest pressure in a sound wave
tuner electrical circuit device that selects specific radio wave frequencies
uplink electromagnetic waves transmitted to a satellite from Earth.
vacuum space containing no particles of matter
verbal using words (spoken or written or sign) as a code between sender and receiver
video conferencing teleconferencing using real-time video images over a monitor
visible light part of the electromagnetic spectrum ranging from 700 to 400 nm.
wavelength the distance from crest to crest or trough to trough on a wave.
Modulation adjustment of an electromagnetic wave so that it carries information
Modem abbreviation for modulator
demodulator device that changes digital signals from computer to analog signals that travel through copper ; also changes analog signals to digital so they can enter a computer
Multimode optic fibre optic fibre, the thickness of a strand of hair through which thousands of different digital transmissions may be sent
Nanometre one billionth of a metre
Non - electronic without use of electricity
non - verbal without the use of words (spoken or written or signed)
Normal ( in terms of optics) perpendicular to the surface of the interface between two mediums
Optical/optically involving light energy
optical fibres a strand of material (commonly glass fibre) through which light can travel
orbit an object rotating around another object in space due to the gravitational pull of the object with greater mass
order of magnitude measurement of size that uses power of ten; two quantities of the same order of magnitude have different but similar sizes
photodiode light sensitive diode that produces an electrical output on exposure to light
polarising (with regards to electromagnetic waves ) limiting the plane of the electromagnetic wave by eliminating waves in other planes
polyurethane (in terms of fibre optics a waterproof coating of an optical fibre
Created by: MCESeniorScience