连续与离散时间信号与系统 英文版PDF|Epub|txt|kindle电子书版本下载

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Part Ⅰ　Introduction to signals and systems1

1　Introduction to signals3

1.1　Classification of signals5

1.2　Elementary signals25

1.3　Signal operations35

1.4　Signal implementation with MATLAB47

1.5　Summary51

Problems53

2　Introduction to systems62

2.1　Examples of systems63

2.2　Classification of systems72

2.3　Interconnection of systems90

2.4　Summary93

Problems94

Part Ⅱ　Continuous-time signals and systems101

3　Time-domain analysis of LTIC systems103

3.1　Representation of LTIC systems103

3.2　Representation of signals using Dirac delta functions112

3.3　Impulse response of a system113

3.4　Convolution integral116

3.5　Graphical method for evaluating the convolution integral118

3.6　Properties of the convolution integral125

3.7　Impulse response of LTIC systems127

3.8　Experiments with MATLAB131

3.9　Summary135

Problems137

4　Signal representation using Fourier series141

4.1　Orthogonal vector space142

4.2　Orthogonal signal space143

4.3　Fourier basis functions149

4.4　Trigonometric CTFS153

4.5　Exponential Fourier series163

4.6　Properties of exponential CTFS169

4.7　Existence of Fourier series177

4.8　Application of Fourier series179

4.9　Summary182

Problems184

5　Continuous-time Fourier transform193

5.1　CTFT for aperiodic signals193

5.2　Examples of CTFT196

5.3　Inverse Fourier transform209

5.4　Fourier transform of real,even,and odd functions211

5.5　Properties of the CTFT216

5.6　Existence of the CTFT231

5.7　CTFT of periodic functions233

5.8　CTFS coefficients as samples of CTFT235

5.9　LTIC systems analysis using CTFT237

5.10　MATLAB exercises246

5.11　Summary251

Problems253

6　Laplace transform261

6.1　Analytical development262

6.2　Unilateral Laplace transform266

6.3　Inverse Laplace transform273

6.4　Properties of the Laplace transform276

6.5　Solution of differential equations288

6.6　Characteristic equation,zeros,and poles293

6.7　Properties of the ROC295

6.8　Stable and causal LTIC systems298

6.9　LTIC systems analysis using Laplace transform305

6.10　Block diagram representations307

6.11　Summary311

Problems313

7　Continuous-time filters320

7.1　Filter classification321

7.2　Non-ideal filter characteristics324

7.3　Design of CT lowpass filters327

7.4　Frequency transformations352

7.5　Summary364

Problems365

8　Case studies for CT systems368

8.1　Amplitude modulation of baseband signals369

8.2　Mechanical spring damper system374

8.3　Armature-controlled dc motor377

8.4　Immune system in humans383

8.5　Summary388

Problems388

Part Ⅲ　Discrete-time signals and systems391

9　Sampling and quantization393

9.1　Ideal impulse-train sampling395

9.2　Practical approaches to sampling405

9.3　Quantization410

9.4　Compact disks413

9.5　Summary415

Problems416

10　Time-domain analysis of discrete-time systems systems422

10.1　Finite-difference equation representation of LTID systems423

10.2　Representation of sequences using Dirac delta functions426

10.3　Impulse response of a system427

10.4　Convolution sum430

10.5　Graphical method for evaluating the convolution sum432

10.6　Periodic convolution439

10.7　Properties of the convolution sum448

10.8　Impulse response of LTID systems451

10.9　Experiments with MATLAB455

10.10　Summary459

Problems460

11　Discrete-time Fourier series and transform464

11.1　Discrete-time Fourier series465

11.2　Fourier transform for aperiodic functions475

11.3　Existence of the DTFT482

11.4　DTFT of periodic functions485

11.5　Properties of the DTFT and the DTFS491

11.6　Frequency response of LTID systems506

11.7　Magnitude and phase spectra507

11.8　Continuous-and discrete-time Fourier transforms514

11.9　Summary517

Problems520

12　Discrete Fourier transform525

12.1　Continuous to discrete Fourier transform526

12.2　Discrete Fourier transform531

12.3　Spectrum analysis using the DFT538

12.4　Properties of the DFT547

12.5　Convolution using the DFT550

12.6　Fast Fourier transform553

12.7　Summary559

Problems560

13　The z-transform565

13.1　Analytical development566

13.2　Unilateral z-transform569

13.3　Inverse z-transform574

13.4　Properties of the z-transform582

13.5　Solution of difference equations594

13.6　z-transfer function of LTID systems596

13.7　Relationship between Laplace and z-transforms599

13.8　Stabilty analysis in the z-domain601

13.9　Frequency-response calculation in the z-domain606

13.10　DTFT and the z-transform607

13.11　Experiments with MATLAB609

13.12　Summary614

Problems616

14　Digital filters621

14.1　Filter classification622

14.2　FIR and IIR filters625

14.3　Phase of a digital filter627

14.4　Ideal versus non-ideal filters632

14.5　Filter realization638

14.6　FIR filters639

14.7　IIR filters644

14.8　Finite precision effect651

14.9　MATLAB examples657

14.10　Summary658

Problems660

15　FIR filter design665

15.1　Lowpass filter design using windowing method666

15.2　Design of highpass filters using windowing684

15.3　Design of bandpass filters using windowing688

15.4　Design of a bandstop filter using windowing691

15.5　Optimal FIR filters693

15.6　MATLAB examples700

15.7　Summary707

Problems709

16　IIR filter design713

16.1　IIR filter design principles714

16.2　Impulse invariance715

16.3　Bilinear transformation728

16.4　Designing highpass,bandpass,and bandstop IIR filters734

16.5　IIR and FIR filters737

16.6　Summary741

Problems742

17　Applications of digital signal processing746

17.1　Spectral estimation746

17.2　Digital audio754

17.3　Audio filtering759

17.4　Digital audio compression765

17.5　Digital images771

17.6　Image filtering777

17.7　Image compression782

17.8　Summary789

Problems789

Appendix A　Mathematical preliminaries793

A.1　Trigonometric identities793

A.2　Power series794

A.3　Series summation794

A.4　Limits and differential calculus795

A.5　Indefinite integrals795

Appendix B　Introducion to the complex-number system797

B.1　Real-number system797

B.2　Complex-number system798

B.3　Graphical interpertation of complex numbers801

B.4　Polar representation of complex numbers801

B.5　Summary805

Problems805

Appendix C　Linear constant-coefficient differential equations806

C.1　Zero-input response807

C.2　Zero-state response810

C.3　Complete response813

Appendix D　Partial fraction expansion814

D.1　Laplace transform814

D.2　Continuous-time Fourier transform822

D.3　Discrete-time Fourier transform825

D.4　The z-transform826

Appendix E　Introduction to MATLAB829

E.1　Introduction829

E.2　Entering data into MATLAB831

E.3　Control statements838

E.4　Elementary matrix operations840

E.5　Plotting functions842

E.6　Creating MATLAB functions846

E.7　Summary847

Appendix F　About the CD848

F.1　Interactive environment848

F.2　Data853

F.3　MATLAB codes854

Bibliography858

Index860