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Chapter 15
Communication Technology
19
Science
10th Grade
04/20/2008

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Term
signal
Definition
a sign that represents information, such as a command, a direction, or a warning
Term
code
Definition
a set of rules used to interpret signals that convey information
Term

telecommunication

Definition
a communication method that uses electromagnetic means
Term
analog signals
Definition
a signal corresponding to a quantity whose values can change continuously
Term
digital signals
Definition
a signal that can be represented as a sequence of discrete values
Term
optical fiber
Definition
a hair-thin, transparent strand of glass or plastic that transmits signals using pulses of light
Term
physical transmission
Definition

a transmission of a signal using wires, cables, or optical fibers

Term
atmospheric transmission
Definition

a transmission of a signal using electromagnetic waves

Term
modulate
Definition

to change a wave’s amplitude or frequency in order to send a signal

Term
carrier
Definition
a continuous wave that can be modulated to send a signal
Term
cathode-ray tube
Definition
a tube that uses an electron beam to create a display on a phosphorescent screen
Term
pixel
Definition
the smallest element of a display image
Term
computer
Definition
an electronic device that can accept data and instructions, follow the instructions, and output the results
Term
random-access memory
Definition
a storage device that allows stored data to be read in the same access time
Term
read-only memory
Definition
a memory device containing data that cannot be changed
Term
hardware
Definition
the equipment that makes up a computer system
Term
software
Definition

the instructions, data, and programming that make a computer system work

Term
operating system
Definition
the software that controls a computer’s activities
Term
internet
Definition
a large computer network that connects many local and smaller networks
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