communication system-chapter 2
DESCRIPTION
this is ppt for quick reference on chapter 2 from b.p lathiTRANSCRIPT
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C H A P T E R 2
SIGNALS AND SIGNAL SPACE
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Figure 2.1 Examples of signals: (a) signal with finite energy;(b) signal with finite power.
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Figure 2.2 Signal for Example 2.1.
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Figure 2.3 (a) Continuous time and (b) discrete time signals.
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Figure 2.4 Examples of signals: (a) analog and continuous time; (b) digital and continuous time;(c) analog and discrete time; (d) digital and discrete time.
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Figure 2.5 Periodic signal of period T0.
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Figure 2.6 Time shifting a signal.
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Figure 2.7 Time scaling a signal.
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Figure 2.8 Examples of time compression and time expansion of signals.
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Figure 2.9 Time inversion (reflection) of a signal.
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Figure 2.10 Example of time inversion.
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Figure 2.11 (a) Unit impulse and (b) its approximation.
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Figure 2.12 (a) Unit step function u(t). (b) Causal exponential e−atu(t).
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Figure 2.13 Component (projection) of a vector along another vector.
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Figure 2.14 Approximations of a vector in terms of another vector.
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Figure 2.15 Approximation of square signal in terms of a single sinusoid.
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Figure 2.16 Signals for Example 2.6.
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Figure 2.17 Physical explanation of the auto-correlation function.
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Figure 2.18 Representation of a vector in three-dimensional space.
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Figure 2.19 (a, b) Periodic signal and (c, d) its Fourier spectra.
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Figure 2.20 (a) Square pulse periodic signal and (b) its Fourier spectrum.
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Figure 2.21 Bipolar square pulse periodic signal.
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Figure 2.22 (a) Impulse train and (b) its Fourier spectrum.
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Figure 2.23 Exponential Fourier spectra for the signal in Fig. 2.19a.
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Figure 2.24 (a) Unit length complex variable with positive frequency (rotating counterclockwise)and (b) unit length complex variable with negative frequency (rotating clockwise).