Download Communication Technology

Communication Technology
Telephone
• There is not much difference between the way a string
telephone and a real telephone work except that electric
current replaces the vibrating string in a telephone.
• In an old-style telephone, the person speaking vibrated a
metal diaphragm.
• The diaphragm’s vibrations rapidly compressed and
uncompressed carbon granules, changing their resistance.
• A current passing through the granules was increased or
decreased by the changing resistance.
• At the other end, the rapidly changing current ran through
a speaker and caused its diaphragm to vibrate back and
forth, so the second person heard the first person speaking.
IPOF in Communication
• Information and communication systems include
the inputs, processes, and outputs associated
with sending and receiving information.
• Almost any information can be transformed into
electrical signals.
• A weak electrical signal can be used to shape a
stronger one, which can control c. other signals of
light, sound, mechanical devices, and radio waves
• The quality of communication is determined by
the strength of the signal in relation d. to the
noise that tends to obscure it.
Facts
• Communication errors can be reduced by
boosting and focusing signals, shielding the signal
from internal and external noise, and repeating
information, but all of these increase cost.
• Digital coding of information (using only 1s and
0s) makes possible more reliable transmission of
information.
• As technologies that provide privacy in
communication improve, so do those for invading
it.
IPOF examples of communication
technology.
• [Example: An electric guitar,
amplifier, and speakers take
a mechanical input (sound
waves from the vibrating
strings), process it (convert
it to an electrical signal),
transmit the electrical signal
to an amplifier that
increases the electrical
signal and sends it on to a
speaker system that
converts the electrical signal
back into a mechanical
output (sound).]
Technology Transfer
• Information and communication systems
allow information to be transferred from
human to human, human to machine, and
machine to machine.
Parts of a communication system
includes the:
•
•
•
•
•
•
Source
Encoder
Transmitter
Receiver
Decoder
Destination
Analysis of a communication
system (GPS)
GPS
• Statement of need (What is the system
supposed to do?)
• Major components (What are the
subsystems?)
• Basic system design (How are the
components or subsystems connected and
how do they interact?)
• Controls (What are the mechanisms that use
information to cause the system to change?)
Function Analysis GPS Continued
• Engineering resources employed (Mechanical, Electrical,
Electronic, Structural, etc.)
• System performance evaluation (What processes are used to
determine system performance?)
• Social, cultural, economic, and political impacts (How does
the technology affect peoples’ lives?)
• Environmental impact (How does the technology affect the
environment?)
Extension Assignment
• Students will research and report on the
design of a communication system.
• You will pick from a list provided on the
extension sheet.