Contents PREFACE x成 1 INTRODUCTION 1 1.1 Signals,Systems.and Signal Processing 2 1.1.1 Basic Elements of a Digital Signal Processing System.4 1.1.2 Advantages of Digital over Analog Signal Processing.5 1.2 Classification of Signals 6 1.2.1 Multichannel and Multidimensional Signals.7 1.2.2 Continuous-Time Versus Discrete-Time Signals.8 12.3 Continuous-Valued Versus Discrete-Valued Signals.10 1.2.4 Deterministic Versus Random Signals,11 1.3 The Concept of Frequency in Continuous-Time and Discrete-Time Signals 14 1.3.]Continuous-Time Sinusoidal Signals.14 1.3.2 Discrete-Time Sinusoidal Signals.16 1.3.3 Harmonically Related Complex Exponentials,19 1.4 Analog-to-Digital and Digital-to-Analog Conversion 21 1.4.1 Sampling of Analog Signals.23 1.42 The Sampling Theorem.29 1.43 Quantization of Continuous-Amplitude Signals,33 1.44 Quantization of Sinusoidal Signals.36 14.5 Coding of Quantized Samples.38 1.4.6 Digital-to-Analog Conversion.38 1.4.7 Analysis of Digital Signals and Systems Versus Discrete-Time Signals and Systems,39 1.5 Summary and References 39 Problems 40 印