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Digital Signals Test Review
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Which signal is used in computers and cell phones?
Digital Signals
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True or False: Noise does not only include sound.
True
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Which signal can travel long distances without losing its quality?
Digital Signals
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This image is an example of...
Noise interference
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The process of varying the properties of a wave in order to encode information is called...
modulation
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The person receiving this message needs to be able to ______ the message
decode
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Combinations of short (dot) and long (dash) wave pulses that represent letters and numbers
Morse Code
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Which signal is made up of infinite possible values?
Analog Signals
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Which signal is NOT continuous?
Digital Signals
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Which signal is more reliable?
Digital Signals
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True or False: This image could be described as pixelated.
False
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True or False: The higher the sampling rate, the smaller the file size.
False
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When an electromagnetic waves has been encoded, we say the wave has been...
modulated
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True or False: Noise does not have as large an effect on digital signals because they have defined levels.
True
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Which signal loses accuracy over long distances?
Analog Signals
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Which value represents a digital signal being on?
1
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Which signal is shown on this graph?
Analog Signals
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What is the name of the code that uses 0's and 1's to transmit information?
Binary Code
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Which signal has waves with a step-like appearance?
Digital Signals
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True or False: When an analog signal is changed because of noise, the information in the signal is also changed.
True
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How often a signal is recorded or converted to digital code is known as the
Sampling Rate
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Human voice is an example of
Analog Signals
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True or False: More data are captured and recorded the more times the event is sampled
True
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Which signal is best for storing large amounts of data?
Digital Signals
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What transmits information?
Waves
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Any unwanted change to a signal
Noise
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When the sender and receiver agree on what the signal means
Encoding
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Which signal is this image an example of?
Analog Signal
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Which value represents a digital signal being off?
0
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Small uniform shapes that are combined to make a larger image
Pixels
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Which signal is smooth and continuous?
Analog Signals
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Samuel Morse developed which telecommunication system?
Morse Code
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All waves transfer what?
Energy
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Which signal can only take on the values of 0 or 1?
Digital Signals
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Which signal is more susceptible to background noise/interference?
Analog Signals
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Which signal can easily correct noise or distortion?
Digital Signals
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What makes nearly every form of communication possible?
Waves
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Which signal is shown on this graph?
Digital Signals
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True or False: This image could be described as pixelated.
True
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Which signals are more secure and useful for confidential information?
Digital Signals
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