Continuous and Discrete Time Signals and Systems
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1 Continuous and Discrete Time Signals and Systems Mrinal Mandal University of Alberta, Edmonton, Canada and Amir Asif York University, Toronto, Canada CAMBRIDGE UNIVERSITY PRESS
2 Contents Preface Parti Introduction to signals and systems page xi l 1 Introduction to signals Classification of signals Elementary signals Signal operations Signal implementation with MATLAB Summary 51 Problems 53 2 Introduction to systems Examples of systems Classification of systems Interconnection of systems Summary 93 Problems 94 Part II Continuous-time signals and systems Time-domain analysis of LTIC systems Representation of LTIC systems Representation of signals using Dirac delta functions Impulse response of a system Convolution integral Graphical method for evaluating the convolution integral Properties of the convolution integral Impulse response of LTIC systems Experiments with MATLAB Summary 135 Problems 137
3 Contents 4 Signal representation using Fourier series Orthogonal vector space Orthogonal signal space Fourier basis functions Trigonometric CTFS Exponential Fourier series Properties of exponential CTFS Existence of Fourier series Application of Fourier series Summary 182 Problems Continuous-time Fourier transform CTFT for aperiodic signals Examples of CTFT Inverse Fourier transform Fourier transform of real, even, and odd functions Properties of the CTFT Existence of the CTFT CTFT of periodic functions CTFS coefficients as samples of CTFT LTIC systems analysis using CTFT MATLAB exercises Summary 251 Problems Laplace transform Analytical development Unilateral Laplace transform Inverse Laplace transform Properties of the Laplace transform Solution of differential equations Characteristic equation, zeros, and poles Properties of the ROC Stable and causal LTIC systems LTIC systems analysis using Laplace transform Block diagram representations Summary 311 Problems Continuous-time filters Filter classification Non-ideal filter characteristics Design of CT lowpass filters 327
4 vii Contents 7.4 Frequency transformations Summary 364 Problems Case studies for CT systems Amplitude modulation of baseband signals Mechanical spring damper system Armature-controlled dc motor Immune system in humans Summary 388 Problems 388 Part III Discrete-time signals and systems Sampling and quantization Ideal impulse-train sampling Practical approaches to sampling Quantization Compact disks Summary 415 Problems Time-domain analysis of discrete-time systems systems Finite-difference equation representation of LTID systems Representation of sequences using Dirac delta functions Impulse response of a system Convolution sum Graphical method for evaluating the convolution sum Periodic convolution Properties of the convolution sum Impulse response of LTID systems Experiments with MATLAB Summary 459 Problems Discrete-time Fourier series and transform Discrete-time Fourier series Fourier transform for aperiodic functions Existence of the DTFT DTFT of periodic functions Properties of the DTFT and the DTFS Frequency response of LTID systems Magnitude and phase spectra 507
5 viii Contents 11.8 Continuous- and discrete-time Fourier transforms Summary 517 Problems Discrete Fourier transform Continuous to discrete Fourier transform Discrete Fourier transform Spectrum analysis using the DFT Properties of the DFT Convolution using the DFT Fast Fourier transform Summary 559 Problems The z-transform Analytical development Unilateral z-transform Inverse z-transform Properties of the z-transform Solution of difference equations z-transfer function of LTID systems Relationship between Laplace and z-transforms Stabilty analysis in the z-domain Frequency-response calculation in the z-domain DTFT and the z-transform Experiments with M A T L А В Summary 614 Problems Digital filters Filter classification FIR and IIR filters Phase of a digital filter Ideal versus non-ideal filters Filter realization FIR filters IIR filters Finite precision effect MATLAB examples Summary 658 Problems FIR filter design Lowpass filter design using windowing method Design of highpass filters using windowing Design of bandpass filters using windowing 688
6 IX Contents 15.4 Design of a bandstop filter using windowing Optimal FIR filters MATLAB examples Summary 707 Problems IIR filter design IIR filter design principles Impulse invariance Bilinear transformation Designing highpass, bandpass, and bandstop IIR filters IIR and FIR filters Summary 741 Problems Applications of digital signal processing Spectral estimation Digital audio Audio filtering Digital audio compression Digital images Image filtering Image compression Summary 789 Problems 789 Appendix A Mathematical preliminaries 793 A. 1 Trigonometric identities 793 A.2 Power series 794 A.3 Series summation 794 A.4 Limits and differential calculus 795 A.5 Indefinite integrals 795 Appendix В Introduction to the complex-number system 797 B.l Real-number system 797 B.2 Complex-number system 798 B.3 Graphical interpertation of complex numbers 801 B.4 Polar representation of complex numbers 801 B.5 Summary 805 Problems 805 Appendix С Linear constant-coefficient differential equations 806 C.l Zero-input response 807 C.2 Zero-state response 810 C.3 Complete response 813
7 Contents Appendix D Partial fraction expansion 814 D.l Laplace transform 814 D.2 Continuous-time Fourier transform 822 D.3 Discrete-time Fourier transform 825 D.4 The z-transform 826 Appendix E Introduction to MATLAB 829 E.l Introduction 829 E.2 Entering data into MATLAB 831 E.3 Control statements 838 E.4 Elementary matrix operations 840 E.5 Plotting functions 842 E.6 Creating MATLAB functions 846 E.7 Summary 847 Appendix F About the CD 848 F. 1 Interactive environment 848 F.2 Data 853 F.3 MATLAB codes 854 Bibliography 858 Index 860
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