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24 Cards in this Set
- Front
- Back
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amplitude
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strength of a wave (sinewave)
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receiver
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device that collects radio waves or microwaves and decodes the signals
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frequency
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number of waves that pass through a given point in one second
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communications satellite
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deviced placed in orbit above the earth to receive and send messages
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transmitter
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device that encodes signals into sine waves and sends them out to be carried on radio waves or microwaves
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twisted-pair wire
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a hardwired transmission channel using copper wires
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uplink
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transmission of signals from an earth station to a communcations satellite
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charge-coupled device
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tiny panel with thousands of light-sensitive cells; encodes light into electronic images
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coaxial cable
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transmission channel consisting of a central conducting wire separated from an uoter conducting layer by an insulator
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phosphor
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substance that gives off light when it receives energy
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RFID
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wireless tech that supports remote tracking of goods, collection of tolls, and many other potential applications
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EMI
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negative impact of electronics and electromagnetic communications characterized by emissions of unwanted or undesirable electromagnetic radiation
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magnetizing wire coil
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NOT found in a state of the art cell phone
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microprocessor and an antenna
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an RFID tag consists of this
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has a 4:3 aspect ratio
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NOT true about high definition television (HDTV)
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red, blue, green
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these colores produce the full pallette of colors we see on color TV and other electronic displays
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cathode ray tube (CRT) and flat panel plasma screen
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two common display units used in today's televisions
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People's privacy might be compromised
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What is likely to be a negative impact of widespread use of RFID technology
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area served by a transmissino tower linked to a switching office
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cell in cellular telephone technology
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all are hardwired
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NOT true about transmission channels
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transceiver
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combined transmitter and receiver unit, common in cell phones
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channel
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a path for communication between sender and receiver
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modulation
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AM radio= amplitude of waves is changed to carry a specific signal; FM signals= the frequency of waves is changed for the same purpose
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fibers
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type of transmission channel , very thin strands of glass that transmit pulses of light, is optical_________
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