CSE3213_04_AnalogDigitalSignalsW2012 part 2

CSE3213_04_AnalogDigitalSignalsW2012 part 2 - 8 Analog vs....

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6 Data vs. Signal Analog vs. Digital Analog Signals Simple Analog Signals Composite Analog Signals Digital Signals
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7 Analog vs. Digital Analog vs. Digital Data analog data – representation variable takes on continuous values in some interval, e.g. voice , temperature , etc. digital data – representation variable takes on discrete of) values in a given interval, e.g. text , digitized images , etc. Analog vs. Digital Signal analog signal – signal that is continuous in time and can assume an infinite number of values in a given range (continuous in time and value) discrete (digital) signal – signal that is continuous in time and assumes only a limited number of values (maintains a constant level and then changes to another constant level) Stallings, pp. 65 “This is an idealized definition. In fact, the transition from one voltage to another is not instantaneous, but there is a small transition period.”
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Unformatted text preview: 8 Analog vs. Digital (cont.) Both analog and digital data can be transmitted using either analog or digital signals. example: analog signaling of analog and digital data will talk more about this later 9 Periodic vs. Aperiodic Signals periodic signal completes a pattern within some measurable time frame, called a period (T), and then repeats that pattern over sub- sequent identical periods T - smallest value that satisfies the equation T is (typically) expressed in seconds aperiodic signal changes without exhibiting a pattern that repeats over time ,-t s(t), T) s(t t. s. R T t t+T periodic analog signal periodic digital signal Analog vs. Digital (cont.) t+2T 10 Data vs. Signal Analog vs. Digital Analog Signals Simple Analog Signals Composite Analog Signals Digital Signals...
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CSE3213_04_AnalogDigitalSignalsW2012 part 2 - 8 Analog vs....

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