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1.1 Introduction 2. Digital Recording 2.1 Introduction 2.2 Signal Amplitude Sampling 2.3 Time (Space) Sampling 2.4 Finite Length Data 2.5 Summary 3. Spectral Analysis 3.1 Fourier Analysis 3.2 Complex Notation 3.3 Complex Symmetry Properties 3.4 Examples of the Fourier Transform 3.5 Discrete Fourier Transform (DFT) 3.6 Calculating the DFT with the FFT 3.7 Summary 4. Filtering4.1 Introduction to Filtering 4.2 Continuous Convolution 4.3 Discrete Convolution 4.4 Convolution Theorem 4.5 Linear System Filtering in Time and Frequency Domain 4.6 Correlation 5. SAGE Data 5.1