dumas_ch03 - Chapter 3: SignalFundamentals...

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Chapter 3 Chapter 3: Signal Fundamentals Principles of Computer Networks  and Communications M. Barry Dumas and Morris Schwartz
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Chapter 3 Principles of Computer Networks and 2 Objectives n Differentiate between signals and information n Describe characteristics, strengths, and weaknesses of analog and digital signals n Understand the relationship between signals and sine waves n Understand the role of noise in a system n Differentiate between signal amplification and signal regeneration n Describe the elements that are involved in and the methods for determining system bandwidth
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Chapter 3 Principles of Computer Networks and 3 Overview There are 2 basic forms of information : 1. Analog ¨ Produced by real world events (e.g., voice, music) ¨ Can take on infinite values created from the event 2. Digital ¨ Produced by computers ¨ Only two values: 1 or 0 There are also 2 basic forms of signals (see above)
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Chapter 3 Principles of Computer Networks and 4 Overview [cont.] Signals (analog or digital) carry information (analog or digital) Leaving 4 possibilities: ¨ Analog information over analog signals ¨ Analog information over digital signals ¨ Digital information over analog signals ¨ Digital information over digital signals
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Chapter 3 Principles of Computer Networks and 5 Analog Signals n Analog signals ¨ Are continuous n Can take whatever shape or power needed to represent information n Can assume an infinite number of values ¨ Cannot change shape instantaneously
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Chapter 3 Principles of Computer Networks and 6 Analog Signals n Analog signals ¨ Are continuous ¨ Cannot change shape instantaneously A L S i g n a l s r e c o m b in t io f im p le w v . Sine waves
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Chapter 3 Principles of Computer Networks and 7 Analog Signals—Sine Waves n 3 characteristics of sine waves : ¨ Amplitude ¨ Frequency ¨ Phase
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Chapter 3 Principles of Computer Networks and 8 Analog Signals—Sine Wave Equation s( t ) = Amplitud e Wave location at time (t) Phas e A sin (2 π f t + φ ) Wave frequency (cycles/second) Time
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Chapter 3 Principles of Computer Networks and 9 Analog Signals—Sine Waves n Characteristics: amplitude , frequency, phase Two sine waves with same frequency same phase different amplitudes S2 amplitude > S1 amplitude
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Chapter 3 Principles of Computer Networks and 10 Analog Signals—Sine Waves n Characteristics: amplitude, frequency , phase Two sine waves with different frequencies same phase same amplitudes S1 frequency > S2 frequency
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Chapter 3 Principles of Computer Networks and 11 Analog Signals—Sine Waves n Characteristics: amplitude, frequency, phase Two sine waves with same frequencies different phases same amplitudes Same wave shifted to right
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Chapter 3 Principles of Computer Networks and 12 Analog Signals—Sine Waves n Consolidated: amplitude , frequency , phase
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This note was uploaded on 11/06/2011 for the course EST 321 taught by Professor Matt during the Fall '11 term at SUNY Stony Brook.

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dumas_ch03 - Chapter 3: SignalFundamentals...

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